Akane Uemichi | Tokyo University of Agriculture and Technology (original) (raw)
Papers by Akane Uemichi
The Proceedings of Mechanical Engineering Congress, Japan, 2019
32nd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2019, 2019
Journal of Japan Society of Energy and Resources, 2017
Journal of Energy Resources Technology, 2022
In hospitals, the energy supply is the key to ensuring modern medical care even during power outa... more In hospitals, the energy supply is the key to ensuring modern medical care even during power outages due to a disaster. This study qualitatively examined whether the supply–demand balance can be stabilized by the private generator prepared by the hospital building during stand-alone operations under disaster conditions. In the nanogrid of the hospital building, the power quality was examined based on the AC frequency, which characterizes the supply–demand balance. Gas engine generators, emergency diesel generators, photovoltaic panels, and storage batteries were presumed to be the private generators in the hospital building. The output reference values for the emergency diesel and gas engine generators were set using droop control, and the C/D controller-enabled synchronized operation. In addition, to keep the AC frequency fluctuation minor, the photovoltaic panels were designed to suppress the output fluctuation using storage batteries. As a result of case studies, the simulator pr...
Journal of Thermal Science and Technology, 2018
Utilization of transport of species and heat release to a DRG-method-based reduction Abstract We ... more Utilization of transport of species and heat release to a DRG-method-based reduction Abstract We propose a new DRG-based mechanism reduction method that considers heat release rate (HRR), transport of species, and reaction rate. In the original DRG method developed by T. Lu and C. K. Law, species importance is evaluated using only the reaction rate, and PSR is used for sampling. However, combustion phenomena are also affected by the transport of species and HRR, and sampling using PSR may be inadequate to produce a skeletal mechanism that can simulate a realistic flame. Therefore, in the proposed transport and heat DRG method, a 1D premixed flame is used for sampling, and species importance is evaluated relative to reaction rate, transport flux, and HRR. The proposed method was evaluated in ethylene/air and n-butane/air 1D premixed flame, and the laminar flame speed and flame structure were obtained using skeletal mechanisms created by three DRG methods, i.e., the original, transport, and transport and heat methods. In the case of the ethylene/air premixed flame, the transport and heat DRG method produced a smaller skeletal mechanism that wellreproduced the result of the detailed mechanism. In the case of n-butane/air premixed flame, smaller skeletal mechanisms were obtained in the region of relative error on laminar flame speed of 0.1-1.0% with the transport and heat DRG method.
The Proceedings of Mechanical Engineering Congress, Japan, 2019
The Proceedings of Mechanical Engineering Congress, Japan, 2019
The effects of elevated-pressure on rotating counterflow twin flame were numerically investigated... more The effects of elevated-pressure on rotating counterflow twin flame were numerically investigated. The range of pressure is from 1 to 8 atm. We performed numerical simulations with and without radiative heat loss. The loss was evaluated by using an optically thin model, which does not consider reabsorption of radiative energy. Without radiation, the leanest extinction limits reached ultralean conditions; the higher the pressure is, the leaner the extinction limits are. On the other hand, with radiative heat loss, the leanest extinction limits are shifted to richer condition as the pressure becomes higher; above 2 atm, the leanest extinction limits cannot reach ultralean condition. The response curves of the flame temperature to the equivalence ratio are distorted when radiative heat loss is considered. Under high pressure, the flame thickness is thinner and the heat release rate is enhanced mainly because of the increase of gaseous density in the both cases of with and without radia...
A combustion oscillation experiment fueling a mixture of hydrogen and natural gas was performed. ... more A combustion oscillation experiment fueling a mixture of hydrogen and natural gas was performed. The results showed oscillating frequencies of around 350 Hz in the case of the town gas only, whereas oscillating frequencies of around 200 and 400 Hz were observed in the hydrogen-containing fuel case. We hypothesized that the oscillating frequencies shift may occur by changing the temperature-distribution inside the tube, which was caused by different combustion conditions with the fuel mixture. As a result, the possible oscillating frequencies of not only around 350 Hz but also around 200 and 400 Hz were obtained. Although three types of possible oscillating frequencies were obtained in our previous study, more detailed temperature distributions should be considered to clarify the effect of the changing fuel mixture composition. In this paper, representative one-dimensional temperature distributions were formed by the combination of measured and calculated temperature distributions in...
ASME 2021 Power Conference, 2021
It is essential to secure energy sources by installing a private power generator for business con... more It is essential to secure energy sources by installing a private power generator for business continuity in a power outage. The authors have developed an optimization tool to estimate the optimal amount of distributed power supply equipment using economic efficiency and resilience as two evaluation indicators. However, it is questionable whether the private generator in a hospital building can generate sufficient electricity to meet demands in case of a power failure, because demand has short cycle fluctuations on the order of seconds, and the private generator must respond to these fluctuations from time to time in the case of stand-alone operation. The optimization tools we have developed in the past have not considered the balance between power output and load demand (demand sufficiency). Therefore, this paper proposes a new optimization method that considers balancing power supply and demand in private generators’ independent operation during power outages. We narrowed the optim...
Journal of Pressure Vessel Technology, 2021
From previous combustion oscillation experiments using a simulated gas turbine combustor, oscilla... more From previous combustion oscillation experiments using a simulated gas turbine combustor, oscillation frequencies around 350 Hz were measured in only natural gas-fired, and around 200 and 400 Hz were measured in the case of hydrogen-containing fuel. In this study, the axial gas column vibration mode was assumed, and the method to reproduce the change of oscillating frequency due to the difference of fuel was investigated. In the previous study, the temperature distribution in the combustor was divided into only two regions, and there were problems in terms of parameter estimation for modeling the flame dynamics. Therefore, the transfer matric method that incorporates a linear temperature gradient was employed. Also, the temperature distributions obtained from computational fluid dynamics, and experiments were reduced to one dimension to reproduce the difference in combustion characteristics due to the difference in fuel composition; four methods were proposed, the axial representati...
The Proceedings of the International symposium on diagnostics and modeling of combustion in internal combustion engines, 2017
Recently, model-based control applicable for diesel engines is attracting attention as an engine ... more Recently, model-based control applicable for diesel engines is attracting attention as an engine control methodology. Discrete combustion models have been developed as control-oriented models expressing diesel combustion, where these models can predict the combustion state, however, NOx emission is not considered. In this paper, the NOx emission model for the discrete model is proposed, and its accuracy was evaluated by comparing with the experiment. In this model, the NOx formation period is defined as the period from the ignition timing to the timing defined by the temperature after combustion. The local reaction temperature of the previous model is modified to consider the effect of the amount of injected fuel. The gas concentrations used in the NOx model are obtained from the discrete combustion model and the amount of NOx emission is calculated by using the Arrhenius equation. In the model, the local reaction temperature under the multiple fuel injection is calculated considering spread of heat released by pre combustion and increment of lean mixture. Then, the prediction accuracy of the NOx model was evaluated by comparison with the experimental result showing that the proposed model can predict NOx emissions within 10% error. Moreover, from the viewpoint of the calculation time, this model can predict both engine output and NOx emission within the period of one cycle of the engine, therefore, it can be applicable to real-time engine control applications.
The Proceedings of the International symposium on diagnostics and modeling of combustion in internal combustion engines, 2017
Recently, internal combustion (IC) engine systems for automobiles have been required to improve t... more Recently, internal combustion (IC) engine systems for automobiles have been required to improve the whole efficiency in a real world. Above all, the turbocharged engine system is attracting attentions. Therefore, it is quite important to consider efficiencies of machine elements such as a turbocharger as well as those related to the combustion process. However, the methods for estimating thermal and mechanical losses of the turbocharger separately and precisely have not been established. In this research, to propose mathematical model capable of predicting mechanical loss induced in a turbocharger, we started with deriving governing equation of the friction loss by a journal bearing and a thrust bearing under operating condition and finally compared with reported data to validate the proposed method. In addition, sensitivity analysis based on the proposed model is performed to investigate the influence of individual physical factors such as rotational speed of the turbocharger, lubrication oil temperature, flow rate and the thrust force on the friction work.
Transactions of the JSME (in Japanese), 2018
Hydrogen combustion is attracting attention because of zero CO2 emission. Recently, a gas turbine... more Hydrogen combustion is attracting attention because of zero CO2 emission. Recently, a gas turbine which uses hydrogen-rich fuel is being developed. In our previous study, we examined the influence of hydrogen-containing ratio on combustion oscillation for fuel mixtures of hydrogen and town gas (13A) experimentally. In the experiment, pressure oscillations were measured by a sensor which is installed at the bottom of the combustor. It is found that two oscillation frequencies near 200 Hz and 400 Hz were simultaneously detected in the case of hydrogen-containing fuels, whereas single oscillation frequency around 350 Hz was observed in the case of only 13A fuel. To understand this difference of oscillating frequencies, we conducted acoustic analysis using one-dimensional different diameter acoustic model. However, this simplest model could not reproduce three types of oscillating frequencies obtained by the experiment. Besides, we used an acoustic impedance of the bottom of the combustion chamber as an acoustic boundary condition. The acoustic impedance is measured experimentally under the noncombustion (cold) condition and corrected by combustion temperature obtained by equilibrium calculation. As a result of applying the corrected acoustic impedance, the three types of oscillating frequencies could be reproduced by acoustic analysis. Furthermore, to express the difference among fuel mixtures, delay times, flame positions, and the mean temperature in the chamber were calculated by the CFD simulation. Consequently, it is found that the acoustic analysis result could reproduce the difference among fuel mixtures; hydrogen makes the oscillating frequencies a little higher because temperature becomes higher and delay time becomes shorter.
The Proceedings of the Dynamics & Design Conference, 2017
One of the mining methods of offshore gas field, Floating production, storage and offloading syst... more One of the mining methods of offshore gas field, Floating production, storage and offloading system (FPSO) is attracting attention. However, the sloshing in an oil-gas separator installed in FPSO excited by waves is expected to cause a serious problem. In order to reduce the sloshing wave height, one of the possible candidate is inserting perforated plates in the tank. In this research, the method for a precise estimation of sloshing wave height in a horizontal cylindrical tank with perforated plates under pitching excitation is proposed. To accomplish this purpose, the pressure loss due to perforated plate should be estimated precisely. Therefore, the relationship between flow velocity and pressure loss and the relationship between flow angle and pressure loss are investigated by CFD calculation. Then, the calculated wave height using the pressure loss calculated by CFD and wave height measured in experiment is compared. Finally, the method of calculating wave height is applied to the real scale FPSO.
The Proceedings of Conference of Kanto Branch, 2019
The Proceedings of the National Symposium on Power and Energy Systems, 2017
Fuel reforming is one of effective methods to control HCCI combustion, and dedicated EGR is an ap... more Fuel reforming is one of effective methods to control HCCI combustion, and dedicated EGR is an apposite fuel reforming system for engines. In this research, the combustion and exhaust characteristics of methane-fueled rich SI engine were investigated by experiments in order to realize the HCCI engine with dedicated EGR. In the experiments, equivalence ratio and spark timing were the operation parameters, and in-cylinder pressure and exhaust gas composition were measured. As a result, it was proved that dedicated EGR enables the generation of H 2 and CO without decrease of thermal efficiency. On rich SI combustion, an excessive advance of ignition timing causes misfire and instability of the engine. In addition, it was shown that thermal efficiency is one of the main performance indexes of the fuel-reforming cylinder, rather than the mole fraction of H 2 and CO in the exhaust gas.
Transactions of the JSME (in Japanese), 2019
Although HCCI combustion has high thermal efficiency, it has difficulties such as controlling its... more Although HCCI combustion has high thermal efficiency, it has difficulties such as controlling its ignition timing and combustion. This study proposed a method to make HCCI combustion in gas engines possible, combining dedicated EGR, SI combustion, and HCCI combustion, i.e. multiple combustion modes engine system. In a DEGR system, one cylinder runs with a premixture of rich fuel and air to reform the part of its exhaust gas into hydrogen and carbon monoxide, which are introduced to other cylinders and promote combustion. In this study, the exhaust gas was introduced through a bypass from rich SI cylinder to HCCI cylinder. In the experiments, conditions of high thermal efficiency and combustion characteristics were investigated. It was revealed that DEGR made HCCI combustion possible on a condition that HCCI combustion was impossible. The more the DEGR rate was, the higher the thermal efficiency was, and the thermal efficiency reached a maximum value when the equivalent ratio of rich SI combustion was adjusted. We proposed the adjustment of premixed gas amount in Rich SI cylinder as a means of improving thermal efficiency, and it was successful.
The Proceedings of Mechanical Engineering Congress, Japan, 2018
The Proceedings of Mechanical Engineering Congress, Japan, 2018
The Proceedings of Mechanical Engineering Congress, Japan, 2019
32nd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2019, 2019
Journal of Japan Society of Energy and Resources, 2017
Journal of Energy Resources Technology, 2022
In hospitals, the energy supply is the key to ensuring modern medical care even during power outa... more In hospitals, the energy supply is the key to ensuring modern medical care even during power outages due to a disaster. This study qualitatively examined whether the supply–demand balance can be stabilized by the private generator prepared by the hospital building during stand-alone operations under disaster conditions. In the nanogrid of the hospital building, the power quality was examined based on the AC frequency, which characterizes the supply–demand balance. Gas engine generators, emergency diesel generators, photovoltaic panels, and storage batteries were presumed to be the private generators in the hospital building. The output reference values for the emergency diesel and gas engine generators were set using droop control, and the C/D controller-enabled synchronized operation. In addition, to keep the AC frequency fluctuation minor, the photovoltaic panels were designed to suppress the output fluctuation using storage batteries. As a result of case studies, the simulator pr...
Journal of Thermal Science and Technology, 2018
Utilization of transport of species and heat release to a DRG-method-based reduction Abstract We ... more Utilization of transport of species and heat release to a DRG-method-based reduction Abstract We propose a new DRG-based mechanism reduction method that considers heat release rate (HRR), transport of species, and reaction rate. In the original DRG method developed by T. Lu and C. K. Law, species importance is evaluated using only the reaction rate, and PSR is used for sampling. However, combustion phenomena are also affected by the transport of species and HRR, and sampling using PSR may be inadequate to produce a skeletal mechanism that can simulate a realistic flame. Therefore, in the proposed transport and heat DRG method, a 1D premixed flame is used for sampling, and species importance is evaluated relative to reaction rate, transport flux, and HRR. The proposed method was evaluated in ethylene/air and n-butane/air 1D premixed flame, and the laminar flame speed and flame structure were obtained using skeletal mechanisms created by three DRG methods, i.e., the original, transport, and transport and heat methods. In the case of the ethylene/air premixed flame, the transport and heat DRG method produced a smaller skeletal mechanism that wellreproduced the result of the detailed mechanism. In the case of n-butane/air premixed flame, smaller skeletal mechanisms were obtained in the region of relative error on laminar flame speed of 0.1-1.0% with the transport and heat DRG method.
The Proceedings of Mechanical Engineering Congress, Japan, 2019
The Proceedings of Mechanical Engineering Congress, Japan, 2019
The effects of elevated-pressure on rotating counterflow twin flame were numerically investigated... more The effects of elevated-pressure on rotating counterflow twin flame were numerically investigated. The range of pressure is from 1 to 8 atm. We performed numerical simulations with and without radiative heat loss. The loss was evaluated by using an optically thin model, which does not consider reabsorption of radiative energy. Without radiation, the leanest extinction limits reached ultralean conditions; the higher the pressure is, the leaner the extinction limits are. On the other hand, with radiative heat loss, the leanest extinction limits are shifted to richer condition as the pressure becomes higher; above 2 atm, the leanest extinction limits cannot reach ultralean condition. The response curves of the flame temperature to the equivalence ratio are distorted when radiative heat loss is considered. Under high pressure, the flame thickness is thinner and the heat release rate is enhanced mainly because of the increase of gaseous density in the both cases of with and without radia...
A combustion oscillation experiment fueling a mixture of hydrogen and natural gas was performed. ... more A combustion oscillation experiment fueling a mixture of hydrogen and natural gas was performed. The results showed oscillating frequencies of around 350 Hz in the case of the town gas only, whereas oscillating frequencies of around 200 and 400 Hz were observed in the hydrogen-containing fuel case. We hypothesized that the oscillating frequencies shift may occur by changing the temperature-distribution inside the tube, which was caused by different combustion conditions with the fuel mixture. As a result, the possible oscillating frequencies of not only around 350 Hz but also around 200 and 400 Hz were obtained. Although three types of possible oscillating frequencies were obtained in our previous study, more detailed temperature distributions should be considered to clarify the effect of the changing fuel mixture composition. In this paper, representative one-dimensional temperature distributions were formed by the combination of measured and calculated temperature distributions in...
ASME 2021 Power Conference, 2021
It is essential to secure energy sources by installing a private power generator for business con... more It is essential to secure energy sources by installing a private power generator for business continuity in a power outage. The authors have developed an optimization tool to estimate the optimal amount of distributed power supply equipment using economic efficiency and resilience as two evaluation indicators. However, it is questionable whether the private generator in a hospital building can generate sufficient electricity to meet demands in case of a power failure, because demand has short cycle fluctuations on the order of seconds, and the private generator must respond to these fluctuations from time to time in the case of stand-alone operation. The optimization tools we have developed in the past have not considered the balance between power output and load demand (demand sufficiency). Therefore, this paper proposes a new optimization method that considers balancing power supply and demand in private generators’ independent operation during power outages. We narrowed the optim...
Journal of Pressure Vessel Technology, 2021
From previous combustion oscillation experiments using a simulated gas turbine combustor, oscilla... more From previous combustion oscillation experiments using a simulated gas turbine combustor, oscillation frequencies around 350 Hz were measured in only natural gas-fired, and around 200 and 400 Hz were measured in the case of hydrogen-containing fuel. In this study, the axial gas column vibration mode was assumed, and the method to reproduce the change of oscillating frequency due to the difference of fuel was investigated. In the previous study, the temperature distribution in the combustor was divided into only two regions, and there were problems in terms of parameter estimation for modeling the flame dynamics. Therefore, the transfer matric method that incorporates a linear temperature gradient was employed. Also, the temperature distributions obtained from computational fluid dynamics, and experiments were reduced to one dimension to reproduce the difference in combustion characteristics due to the difference in fuel composition; four methods were proposed, the axial representati...
The Proceedings of the International symposium on diagnostics and modeling of combustion in internal combustion engines, 2017
Recently, model-based control applicable for diesel engines is attracting attention as an engine ... more Recently, model-based control applicable for diesel engines is attracting attention as an engine control methodology. Discrete combustion models have been developed as control-oriented models expressing diesel combustion, where these models can predict the combustion state, however, NOx emission is not considered. In this paper, the NOx emission model for the discrete model is proposed, and its accuracy was evaluated by comparing with the experiment. In this model, the NOx formation period is defined as the period from the ignition timing to the timing defined by the temperature after combustion. The local reaction temperature of the previous model is modified to consider the effect of the amount of injected fuel. The gas concentrations used in the NOx model are obtained from the discrete combustion model and the amount of NOx emission is calculated by using the Arrhenius equation. In the model, the local reaction temperature under the multiple fuel injection is calculated considering spread of heat released by pre combustion and increment of lean mixture. Then, the prediction accuracy of the NOx model was evaluated by comparison with the experimental result showing that the proposed model can predict NOx emissions within 10% error. Moreover, from the viewpoint of the calculation time, this model can predict both engine output and NOx emission within the period of one cycle of the engine, therefore, it can be applicable to real-time engine control applications.
The Proceedings of the International symposium on diagnostics and modeling of combustion in internal combustion engines, 2017
Recently, internal combustion (IC) engine systems for automobiles have been required to improve t... more Recently, internal combustion (IC) engine systems for automobiles have been required to improve the whole efficiency in a real world. Above all, the turbocharged engine system is attracting attentions. Therefore, it is quite important to consider efficiencies of machine elements such as a turbocharger as well as those related to the combustion process. However, the methods for estimating thermal and mechanical losses of the turbocharger separately and precisely have not been established. In this research, to propose mathematical model capable of predicting mechanical loss induced in a turbocharger, we started with deriving governing equation of the friction loss by a journal bearing and a thrust bearing under operating condition and finally compared with reported data to validate the proposed method. In addition, sensitivity analysis based on the proposed model is performed to investigate the influence of individual physical factors such as rotational speed of the turbocharger, lubrication oil temperature, flow rate and the thrust force on the friction work.
Transactions of the JSME (in Japanese), 2018
Hydrogen combustion is attracting attention because of zero CO2 emission. Recently, a gas turbine... more Hydrogen combustion is attracting attention because of zero CO2 emission. Recently, a gas turbine which uses hydrogen-rich fuel is being developed. In our previous study, we examined the influence of hydrogen-containing ratio on combustion oscillation for fuel mixtures of hydrogen and town gas (13A) experimentally. In the experiment, pressure oscillations were measured by a sensor which is installed at the bottom of the combustor. It is found that two oscillation frequencies near 200 Hz and 400 Hz were simultaneously detected in the case of hydrogen-containing fuels, whereas single oscillation frequency around 350 Hz was observed in the case of only 13A fuel. To understand this difference of oscillating frequencies, we conducted acoustic analysis using one-dimensional different diameter acoustic model. However, this simplest model could not reproduce three types of oscillating frequencies obtained by the experiment. Besides, we used an acoustic impedance of the bottom of the combustion chamber as an acoustic boundary condition. The acoustic impedance is measured experimentally under the noncombustion (cold) condition and corrected by combustion temperature obtained by equilibrium calculation. As a result of applying the corrected acoustic impedance, the three types of oscillating frequencies could be reproduced by acoustic analysis. Furthermore, to express the difference among fuel mixtures, delay times, flame positions, and the mean temperature in the chamber were calculated by the CFD simulation. Consequently, it is found that the acoustic analysis result could reproduce the difference among fuel mixtures; hydrogen makes the oscillating frequencies a little higher because temperature becomes higher and delay time becomes shorter.
The Proceedings of the Dynamics & Design Conference, 2017
One of the mining methods of offshore gas field, Floating production, storage and offloading syst... more One of the mining methods of offshore gas field, Floating production, storage and offloading system (FPSO) is attracting attention. However, the sloshing in an oil-gas separator installed in FPSO excited by waves is expected to cause a serious problem. In order to reduce the sloshing wave height, one of the possible candidate is inserting perforated plates in the tank. In this research, the method for a precise estimation of sloshing wave height in a horizontal cylindrical tank with perforated plates under pitching excitation is proposed. To accomplish this purpose, the pressure loss due to perforated plate should be estimated precisely. Therefore, the relationship between flow velocity and pressure loss and the relationship between flow angle and pressure loss are investigated by CFD calculation. Then, the calculated wave height using the pressure loss calculated by CFD and wave height measured in experiment is compared. Finally, the method of calculating wave height is applied to the real scale FPSO.
The Proceedings of Conference of Kanto Branch, 2019
The Proceedings of the National Symposium on Power and Energy Systems, 2017
Fuel reforming is one of effective methods to control HCCI combustion, and dedicated EGR is an ap... more Fuel reforming is one of effective methods to control HCCI combustion, and dedicated EGR is an apposite fuel reforming system for engines. In this research, the combustion and exhaust characteristics of methane-fueled rich SI engine were investigated by experiments in order to realize the HCCI engine with dedicated EGR. In the experiments, equivalence ratio and spark timing were the operation parameters, and in-cylinder pressure and exhaust gas composition were measured. As a result, it was proved that dedicated EGR enables the generation of H 2 and CO without decrease of thermal efficiency. On rich SI combustion, an excessive advance of ignition timing causes misfire and instability of the engine. In addition, it was shown that thermal efficiency is one of the main performance indexes of the fuel-reforming cylinder, rather than the mole fraction of H 2 and CO in the exhaust gas.
Transactions of the JSME (in Japanese), 2019
Although HCCI combustion has high thermal efficiency, it has difficulties such as controlling its... more Although HCCI combustion has high thermal efficiency, it has difficulties such as controlling its ignition timing and combustion. This study proposed a method to make HCCI combustion in gas engines possible, combining dedicated EGR, SI combustion, and HCCI combustion, i.e. multiple combustion modes engine system. In a DEGR system, one cylinder runs with a premixture of rich fuel and air to reform the part of its exhaust gas into hydrogen and carbon monoxide, which are introduced to other cylinders and promote combustion. In this study, the exhaust gas was introduced through a bypass from rich SI cylinder to HCCI cylinder. In the experiments, conditions of high thermal efficiency and combustion characteristics were investigated. It was revealed that DEGR made HCCI combustion possible on a condition that HCCI combustion was impossible. The more the DEGR rate was, the higher the thermal efficiency was, and the thermal efficiency reached a maximum value when the equivalent ratio of rich SI combustion was adjusted. We proposed the adjustment of premixed gas amount in Rich SI cylinder as a means of improving thermal efficiency, and it was successful.
The Proceedings of Mechanical Engineering Congress, Japan, 2018
The Proceedings of Mechanical Engineering Congress, Japan, 2018