Miroslaw Wyszynski | University of Birmingham (original) (raw)

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Papers by Miroslaw Wyszynski

Research paper thumbnail of Effect of inlet valve timing and water blending on bioethanol HCCI combustion using forced induction and residual gas trapping

Research paper thumbnail of Influence of the addition of LPG-reformate and H2 on an engine dually fuelled with LPG–diesel, –RME and –GTL Fuels

Research paper thumbnail of Combustion and Emissions of 2,5Dimethylfuran in a Direct-Injection Spark-Ignition Engine

Energy & Fuels, 2010

Biomass has the potential to become an important source of energy for future automotive fuels. Re... more Biomass has the potential to become an important source of energy for future automotive fuels. Recent biological and chemical improvements to the conversion of biomass-derived carbohydrates have produced high yields of liquid 2,5-dimethylfuran (DMF). This discovery has made ...

Research paper thumbnail of Effect of spark timing and load on a DISI engine fuelled with 2,5-dimethylfuran

Research paper thumbnail of Use of catalytic reforming to aid natural gas HCCI combustion in engines: experimental and modelling results of open-loop fuel reforming

International Journal of Hydrogen Energy, 2005

Research paper thumbnail of An Investigation into Bioethanol Homogeneous Charge Compression Ignition (HCCI) Engine Operation with Residual Gas Trapping

Energy & Fuels, 2004

... characteristic of ethanol. Taljaard et al. 3 studied the effects of addition of oxygenates in... more ... characteristic of ethanol. Taljaard et al. 3 studied the effects of addition of oxygenates in gasoline on engine exhaust emissions and performance using a single-cylinder, four-stroke, spark ignition (SI) engine. They concluded that ...

Research paper thumbnail of Influence of Inlet Air Temperature on Gasoline HCCI Particulate Emissions

Combustion Science and Technology, 2009

ABSTRACT Particulate emissions from homogeneous charge compression ignition (HCCI) engines have b... more ABSTRACT Particulate emissions from homogeneous charge compression ignition (HCCI) engines have been usually considered negligible, and the measurement of particulates (PM) with HCCI combustion systems has been extremely rare. A report from Ford and the authors' own recently published work suggest that PM emissions from gasoline HCCI engines should not be neglected. It has been shown that PM emissions for SI and HCCI engines can be very similar, especially in the accumulation mode. In the present work, the influence of inlet air temperature was investigated. A purpose-built inlet air thermal management system was in use for this purpose. An electric heater in line with an air/engine coolant heat exchanger was used to heat inlet air to 30–40°C above standard operation conditions. A water-cooled intercooler was in use during the second set of tests. Inlet air was cooled approximately 20°C below the case where no heating or cooling was implemented. It has been found that increasing the air temperature will lead to a higher concentration of nucleation mode particles (having diameters 10–20 nm) and lower concentration of accumulation mode particles (with diameters 80–90 nm). When inlet air was cooled, a reverse trend has been observed, especially in the accumulation mode. It was also observed that increasing the load will reduce the differences caused by changes in the inlet air temperature. Finally, trends similar to those observed for direct injection spark ignition (DISI) engines have been observed as well. Increasing either engine speed or engine load leads to increased PM emissions.

Research paper thumbnail of HCCI ENGINE MODELLING FOR THE PURPOSE OF CONTROL DEVELOPMENT

Research paper thumbnail of Optical Study of Flow and Combustion in an HCCI Engine with Negative Valve Overlap

Journal of Physics: Conference Series, 2006

One of the most widely used methods to enable Homogeneous Charge Compression Ignition (HCCI) comb... more One of the most widely used methods to enable Homogeneous Charge Compression Ignition (HCCI) combustion is using negative valve overlapping to trap a sufficient quantity of hot residual gas. The characteristics of air motion with specially designed valve events having reduced valve lift and durations associated with HCCI engines and their effect on subsequent combustion are not yet fully understood. In addition, the ignition process and combustion development in such engines are very different from those in conventional spark-ignition or diesel compression ignition engines. Very little data has been reported concerning optical diagnostics of the flow and combustion in the engine using negative valve overlapping. This paper presents an experimental investigation into the in-cylinder flow characteristics and combustion development in an optical engine operating in HCCI combustion mode. PIV measurements have been taken under motored engine conditions to provide a quantitative flow characterisation of negative valve overlap in-cylinder flows. The ignition and combustion process was imaged using a high resolution charge coupled device (CCD) camera and the combustion imaging data was supplemented by simultaneously recorded in-cylinder pressure data which assisted the analysis of the images. It is found that the flow characteristics with negative valve overlapping are less stable and more valve event driven than typical spark ignition in-cylinder flows, while the combustion initiation locations are not uniformly distributed.

Research paper thumbnail of Effect of Gas-to-Liquid Diesel Fuels on Combustion Characteristics, Engine Emissions, and Exhaust Gas Fuel Reforming. Comparative Study

Research paper thumbnail of Effect of hydrogen addition on natural gas HCCI combustion

Research paper thumbnail of Effect of Air Intake Pressure Drop on Performance and Emissions of a Diesel Engine Operating with Biodiesel and Ultra Low Sulphur Diesel (ULSD

... Rizalman Mamat, Nik Rosli Abdullah, Hongming Xu, Miroslaw L. Wyszynski, Athanasios Tsolakis .... more ... Rizalman Mamat, Nik Rosli Abdullah, Hongming Xu, Miroslaw L. Wyszynski, Athanasios Tsolakis ... 7. Acknowledgement The authors want to thank to the Government of Malaysia for PhD. scholarship awarded to Mr Rizalman Mamat and Mr Nik Rosli Abdullah. ...

Research paper thumbnail of An investigation into propane homogeneous charge compression ignition (HCCI) engine operation with residual gas trapping

Fuel, 2005

... recirculation. This dilution effectively slows down the rate of combustion [6] , [7] , [8] , ... more ... recirculation. This dilution effectively slows down the rate of combustion [6] , [7] , [8] , [9] and [10]. ... This would then result in hot residual gases flowing from the cylinder across the valves into the inlet manifold and cooling down. These ...

Research paper thumbnail of Particulate Matter size distribution in the exhaust gas of a modern diesel Engine fuelled with a biodiesel blend

Biomass & Bioenergy, 2011

ABSTRACT The characteristics of particulate mater size distribution in the exhaust gas of an auto... more ABSTRACT The characteristics of particulate mater size distribution in the exhaust gas of an automotive diesel engine have been studied for a biodiesel blend of 30% rapeseed methyl ester (RME) and 70% ultra low sulphur diesel (ULSD) by volume (B30). The engine, a twin-turbo charged V6 equipped with a common rail fuel injection system, was operated on 16 steady-state points extracted from a corresponding New European Driving Cycle test with no engine system modification and a fast differential mobility spectrometer was used to determine the particulate number concentration and distribution. It is shown that the number-size distribution is dependent on engine operating conditions including the rate of exhaust gas recirculation (EGR). Compared with ULSD, B30 leads to a 41% smaller average size of the particles with EGR but gives rise to a higher number concentration under certain engine operating conditions, with the differences varying between nucleation and accumulation mode. The calculated particle total mass for B30 combustion aerosol is lower than the value with ULSD for all the engine operating conditions tested. The average B30 aerosol was 28% smaller in size on mass basis, compared to ULSD aerosol. For both fuels, the relationship between the particle total number and total mass has been found to be directly correlated and both the number and the mass of particles increase when the mean diameters of particles increase.

Research paper thumbnail of Low temperature exhaust gas fuel reforming of diesel fuel

Research paper thumbnail of HCCI Engine Modeling for Real-Time Implementation and Control Development

IEEE-ASME Transactions on Mechatronics, 2007

Research paper thumbnail of A modelling study into the effects of variable valve timing on the gas exchange process and performance of a 4-valve DI homogeneous charge compression ignition (HCCI) engine

Energy Conversion and Management, 2009

Research paper thumbnail of AN INVESTIGATION OF THE PRESENCE OF UNCONTROLLED COMBUSTION PHENOMENON IN SPARK IGNITION SINGLE CYLINDER OPTICAL ENGINE

Research paper thumbnail of Cylinder-to-Cylinder Variations in a V6 Gasoline Direct Injection HCCI Engine

Journal of Engineering for Gas Turbines and Power-transactions of The Asme, 2009

ABSTRACT Despite the fact that homogeneous charge compression ignition (HCCI) has been demonstrat... more ABSTRACT Despite the fact that homogeneous charge compression ignition (HCCI) has been demonstrated as a combustion technology feasible for implementation with different fuels in various types of engines, cylinder-to-cylinder variations (CTCVs) in multicylinder HCCI engines remain one of the technical obstacles to overcome. A reduction in CTCV requires further developments in control technology. This study has been carried out with regard to the overall engine parameters, involving geometric differences between individual cylinders, coolant paths through the engine, combustion chamber deposits, and also the differences in the inlet temperature distributions between the cylinders. Experimental investigations on the Jaguar V6 HCCI research engine with negative valve overlapping and cam profile switching show that the differences in the rate of pressure rise between the cylinders can be larger than 1 bar/CA deg and that the load differences can be as high as 5-10%. It has been found that some individual cylinders will approach the misfiring limit far earlier than the others. The complex interaction between a number of parameters makes the control of the multicylinder engine a serious challenge. In order to avoid these differences, an active cylinder balancing strategy will be required. It has been observed that spark assistance and split injection strategy deliver the best control for the cylinder balance. However, spark assistance is restricted to low loads and low engine speeds, while split injection requires a considerable effort to optimize its possible settings. This paper defines the most important parameters influencing cylinder-to-cylinder variations in the HCCI engine and aims to put forward suggestions that can help to minimize the effect of cylinder-to-cylinder variations on the overall engine performance.

Research paper thumbnail of Hydrogen enrichment: a way to maintain combustion stability in a natural gas fuelled engine with exhaust gas recirculation, the potential of fuel reforming

Proceedings of The Institution of Mechanical Engineers Part D-journal of Automobile Engineering, 2001

... these crevice-bound hydrocarbons late in the cycle that required to optimize the performance ... more ... these crevice-bound hydrocarbons late in the cycle that required to optimize the performance of the catalyst at ... 4 CONCLUSIONS AND RECOMMENDATIONS mixture with hydrogen enrichment without on-line monitoring of hydrogen emissions. ...

Research paper thumbnail of Effect of inlet valve timing and water blending on bioethanol HCCI combustion using forced induction and residual gas trapping

Research paper thumbnail of Influence of the addition of LPG-reformate and H2 on an engine dually fuelled with LPG–diesel, –RME and –GTL Fuels

Research paper thumbnail of Combustion and Emissions of 2,5Dimethylfuran in a Direct-Injection Spark-Ignition Engine

Energy & Fuels, 2010

Biomass has the potential to become an important source of energy for future automotive fuels. Re... more Biomass has the potential to become an important source of energy for future automotive fuels. Recent biological and chemical improvements to the conversion of biomass-derived carbohydrates have produced high yields of liquid 2,5-dimethylfuran (DMF). This discovery has made ...

Research paper thumbnail of Effect of spark timing and load on a DISI engine fuelled with 2,5-dimethylfuran

Research paper thumbnail of Use of catalytic reforming to aid natural gas HCCI combustion in engines: experimental and modelling results of open-loop fuel reforming

International Journal of Hydrogen Energy, 2005

Research paper thumbnail of An Investigation into Bioethanol Homogeneous Charge Compression Ignition (HCCI) Engine Operation with Residual Gas Trapping

Energy & Fuels, 2004

... characteristic of ethanol. Taljaard et al. 3 studied the effects of addition of oxygenates in... more ... characteristic of ethanol. Taljaard et al. 3 studied the effects of addition of oxygenates in gasoline on engine exhaust emissions and performance using a single-cylinder, four-stroke, spark ignition (SI) engine. They concluded that ...

Research paper thumbnail of Influence of Inlet Air Temperature on Gasoline HCCI Particulate Emissions

Combustion Science and Technology, 2009

ABSTRACT Particulate emissions from homogeneous charge compression ignition (HCCI) engines have b... more ABSTRACT Particulate emissions from homogeneous charge compression ignition (HCCI) engines have been usually considered negligible, and the measurement of particulates (PM) with HCCI combustion systems has been extremely rare. A report from Ford and the authors' own recently published work suggest that PM emissions from gasoline HCCI engines should not be neglected. It has been shown that PM emissions for SI and HCCI engines can be very similar, especially in the accumulation mode. In the present work, the influence of inlet air temperature was investigated. A purpose-built inlet air thermal management system was in use for this purpose. An electric heater in line with an air/engine coolant heat exchanger was used to heat inlet air to 30–40°C above standard operation conditions. A water-cooled intercooler was in use during the second set of tests. Inlet air was cooled approximately 20°C below the case where no heating or cooling was implemented. It has been found that increasing the air temperature will lead to a higher concentration of nucleation mode particles (having diameters 10–20 nm) and lower concentration of accumulation mode particles (with diameters 80–90 nm). When inlet air was cooled, a reverse trend has been observed, especially in the accumulation mode. It was also observed that increasing the load will reduce the differences caused by changes in the inlet air temperature. Finally, trends similar to those observed for direct injection spark ignition (DISI) engines have been observed as well. Increasing either engine speed or engine load leads to increased PM emissions.

Research paper thumbnail of HCCI ENGINE MODELLING FOR THE PURPOSE OF CONTROL DEVELOPMENT

Research paper thumbnail of Optical Study of Flow and Combustion in an HCCI Engine with Negative Valve Overlap

Journal of Physics: Conference Series, 2006

One of the most widely used methods to enable Homogeneous Charge Compression Ignition (HCCI) comb... more One of the most widely used methods to enable Homogeneous Charge Compression Ignition (HCCI) combustion is using negative valve overlapping to trap a sufficient quantity of hot residual gas. The characteristics of air motion with specially designed valve events having reduced valve lift and durations associated with HCCI engines and their effect on subsequent combustion are not yet fully understood. In addition, the ignition process and combustion development in such engines are very different from those in conventional spark-ignition or diesel compression ignition engines. Very little data has been reported concerning optical diagnostics of the flow and combustion in the engine using negative valve overlapping. This paper presents an experimental investigation into the in-cylinder flow characteristics and combustion development in an optical engine operating in HCCI combustion mode. PIV measurements have been taken under motored engine conditions to provide a quantitative flow characterisation of negative valve overlap in-cylinder flows. The ignition and combustion process was imaged using a high resolution charge coupled device (CCD) camera and the combustion imaging data was supplemented by simultaneously recorded in-cylinder pressure data which assisted the analysis of the images. It is found that the flow characteristics with negative valve overlapping are less stable and more valve event driven than typical spark ignition in-cylinder flows, while the combustion initiation locations are not uniformly distributed.

Research paper thumbnail of Effect of Gas-to-Liquid Diesel Fuels on Combustion Characteristics, Engine Emissions, and Exhaust Gas Fuel Reforming. Comparative Study

Research paper thumbnail of Effect of hydrogen addition on natural gas HCCI combustion

Research paper thumbnail of Effect of Air Intake Pressure Drop on Performance and Emissions of a Diesel Engine Operating with Biodiesel and Ultra Low Sulphur Diesel (ULSD

... Rizalman Mamat, Nik Rosli Abdullah, Hongming Xu, Miroslaw L. Wyszynski, Athanasios Tsolakis .... more ... Rizalman Mamat, Nik Rosli Abdullah, Hongming Xu, Miroslaw L. Wyszynski, Athanasios Tsolakis ... 7. Acknowledgement The authors want to thank to the Government of Malaysia for PhD. scholarship awarded to Mr Rizalman Mamat and Mr Nik Rosli Abdullah. ...

Research paper thumbnail of An investigation into propane homogeneous charge compression ignition (HCCI) engine operation with residual gas trapping

Fuel, 2005

... recirculation. This dilution effectively slows down the rate of combustion [6] , [7] , [8] , ... more ... recirculation. This dilution effectively slows down the rate of combustion [6] , [7] , [8] , [9] and [10]. ... This would then result in hot residual gases flowing from the cylinder across the valves into the inlet manifold and cooling down. These ...

Research paper thumbnail of Particulate Matter size distribution in the exhaust gas of a modern diesel Engine fuelled with a biodiesel blend

Biomass & Bioenergy, 2011

ABSTRACT The characteristics of particulate mater size distribution in the exhaust gas of an auto... more ABSTRACT The characteristics of particulate mater size distribution in the exhaust gas of an automotive diesel engine have been studied for a biodiesel blend of 30% rapeseed methyl ester (RME) and 70% ultra low sulphur diesel (ULSD) by volume (B30). The engine, a twin-turbo charged V6 equipped with a common rail fuel injection system, was operated on 16 steady-state points extracted from a corresponding New European Driving Cycle test with no engine system modification and a fast differential mobility spectrometer was used to determine the particulate number concentration and distribution. It is shown that the number-size distribution is dependent on engine operating conditions including the rate of exhaust gas recirculation (EGR). Compared with ULSD, B30 leads to a 41% smaller average size of the particles with EGR but gives rise to a higher number concentration under certain engine operating conditions, with the differences varying between nucleation and accumulation mode. The calculated particle total mass for B30 combustion aerosol is lower than the value with ULSD for all the engine operating conditions tested. The average B30 aerosol was 28% smaller in size on mass basis, compared to ULSD aerosol. For both fuels, the relationship between the particle total number and total mass has been found to be directly correlated and both the number and the mass of particles increase when the mean diameters of particles increase.

Research paper thumbnail of Low temperature exhaust gas fuel reforming of diesel fuel

Research paper thumbnail of HCCI Engine Modeling for Real-Time Implementation and Control Development

IEEE-ASME Transactions on Mechatronics, 2007

Research paper thumbnail of A modelling study into the effects of variable valve timing on the gas exchange process and performance of a 4-valve DI homogeneous charge compression ignition (HCCI) engine

Energy Conversion and Management, 2009

Research paper thumbnail of AN INVESTIGATION OF THE PRESENCE OF UNCONTROLLED COMBUSTION PHENOMENON IN SPARK IGNITION SINGLE CYLINDER OPTICAL ENGINE

Research paper thumbnail of Cylinder-to-Cylinder Variations in a V6 Gasoline Direct Injection HCCI Engine

Journal of Engineering for Gas Turbines and Power-transactions of The Asme, 2009

ABSTRACT Despite the fact that homogeneous charge compression ignition (HCCI) has been demonstrat... more ABSTRACT Despite the fact that homogeneous charge compression ignition (HCCI) has been demonstrated as a combustion technology feasible for implementation with different fuels in various types of engines, cylinder-to-cylinder variations (CTCVs) in multicylinder HCCI engines remain one of the technical obstacles to overcome. A reduction in CTCV requires further developments in control technology. This study has been carried out with regard to the overall engine parameters, involving geometric differences between individual cylinders, coolant paths through the engine, combustion chamber deposits, and also the differences in the inlet temperature distributions between the cylinders. Experimental investigations on the Jaguar V6 HCCI research engine with negative valve overlapping and cam profile switching show that the differences in the rate of pressure rise between the cylinders can be larger than 1 bar/CA deg and that the load differences can be as high as 5-10%. It has been found that some individual cylinders will approach the misfiring limit far earlier than the others. The complex interaction between a number of parameters makes the control of the multicylinder engine a serious challenge. In order to avoid these differences, an active cylinder balancing strategy will be required. It has been observed that spark assistance and split injection strategy deliver the best control for the cylinder balance. However, spark assistance is restricted to low loads and low engine speeds, while split injection requires a considerable effort to optimize its possible settings. This paper defines the most important parameters influencing cylinder-to-cylinder variations in the HCCI engine and aims to put forward suggestions that can help to minimize the effect of cylinder-to-cylinder variations on the overall engine performance.

Research paper thumbnail of Hydrogen enrichment: a way to maintain combustion stability in a natural gas fuelled engine with exhaust gas recirculation, the potential of fuel reforming

Proceedings of The Institution of Mechanical Engineers Part D-journal of Automobile Engineering, 2001

... these crevice-bound hydrocarbons late in the cycle that required to optimize the performance ... more ... these crevice-bound hydrocarbons late in the cycle that required to optimize the performance of the catalyst at ... 4 CONCLUSIONS AND RECOMMENDATIONS mixture with hydrogen enrichment without on-line monitoring of hydrogen emissions. ...