Yash Menon | Amrita Vishwa Vidyapeetham (original) (raw)
Mr. Yash Krishna Menon received his B.Tech. (Mechanical Engineering) from Mumbai University, in 2014 and M.Tech. (Thermal & Fluids Engineering) from Amrita University, in 2017. His areas of interest are electronics cooling, thermal design and analysis of electro-mechnical systems. He has authored and co-authored several technical articles which are published in Scopus indexed journals. He has more than 3.5 years of professional experience in CFD simulations using Ansys Fluent, Matlab and Flo-THERM.
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National Pingtung University of Science and Technology
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Papers by Yash Menon
IHMTC 2017 Conference, 2017
Modern gas turbine engines require highly effective effusion cooling system for protection of com... more Modern gas turbine engines require highly effective effusion cooling system for protection of combustor liners. To enhance the performance of effusion cooling, a new design concept of grooves is presented in this paper. In this new concept, rectangular grooves are created along the mainstream flow path and the effusion cooling holes are embedded in these grooves. The objective of the present study is, to assess the usefulness of groove concept in improving the cooling performance of simple cylindrical holes used in effusion cooling and perform a parametric study to examine the effects of design parameters of a groove on cooling effectiveness so as to find the optimum dimensions of a groove for which cooling effectiveness is maximum. In the present study, a simple flat plate model and seven grooved plate models are considered for analysis. In grooved plates, the groove shape is defined by two geometric parameters viz. width and depth. To study the effect of design parameters of grooves on cooling effectiveness, various groove widths and depths are considered for analysis. In this study, average cooling effectiveness obtained by seven grooved plates having different groove configuration are compared amongst themselves and with the simple plate. Numerical simulations have been performed at three different blowing ratios 1, 2 and 3 for all cases using ANSYS Fluent and the flow field is solved by using k-ε realizable turbulence model. In addition, an experimental investigation is carried out on simple and grooved test plates in order to benchmark the reliability of CFD results. Experiments were conducted in subsonic wind tunnel at mainstream Reynolds number of 120000 based on hydraulic diameter of the test section. Steady state cooling effectiveness measurements are obtained by using IR thermography technique. The results showed that the lateral averaged cooling effectiveness increased remarkably when grooves are incorporated into the effusion cooling system. This increase was mainly due to reduced jet lift-off and reduced coolant mainstream interaction near hole exit. Variation in the dimensions of the grooves also greatly affected the cooling performance.
Abstract— Alcohols, basically ethanol is considered as a leading alternative fuel for automotive... more Abstract— Alcohols, basically ethanol is considered as a leading alternative fuel for automotive application because of its ability to reduce the air pollution and cost of the fuel. This project investigates the effect of lower ethanol gasoline blends (up to 30% by volume) on performance and emission characteristics of the single cylinder four stroke S.I. engine. Tests were carried out for power, fuel consumption and exhaust emissions for CO and HC atgenerator speed of 1200 rpm to 1500 rpm. Results werecompared with the pure gasoline.
This paper presents a new design concept to increase the adiabatic effectiveness of cylindrical h... more This paper presents a new design concept to increase the adiabatic effectiveness of cylindrical holes used for film cooling in gas turbine. Rectangular grooves are created at the downstream of each cylindrical hole. The grooves are incorporated into the film cooling system to reduce the adverse effects of the kidney vortices since the kidney vortices reduce the effectiveness of circular cross-section film cooling holes at moderate to high blowing ratios by inducing jet lift-off. The groove shape is defined by two geometric parameters viz. width and depth. A single row of five discrete film cooling holes on a flat plate with an inclination angle of 30° along streamwise direction and pitch to diameter ratio of 2 was chosen as the baseline test case. In this study, cooling effectiveness curves obtained by four grooved plates having different groove configuration is compared amongst themselves and with the simple plate. Numerical simulations have been performed at three different blowing ratios of 0.5, 1.0 and 1.5 for each case of the rectangular groove and simple plate by using CFD technique (ANSYS Fluent) and the flow field is solved by using k-ε realizable turbulence model. The results showed that the lateral averaged cooling effectiveness is increased remarkably when the downstream rectangular grooves are present. This increase is because of the fact that, in grooved plates, majority volume of the coolant is flowing within the grooves, so it is properly guided and protected by the grooves. This reduced the turbulent mixing between mainstream and coolant flow. Another reason is that side walls of the groove do not allow hot mainstream gasses to enter underneath coolant jet from the sideways. This reduced the jet lift-off and improved the cooling effectiveness. Apart from this, the effects of each geometrical parameter of the groove on the film cooling effectiveness were studied in detail and observed that average cooling effectiveness distribution is higher for grooves with least aspect ratio for low blowing ratio. Numerical Simulation to Investigate Effect of Downstream Grooves on Film Cooling Effectiveness of Gas Turbine Blades
IHMTC 2017 Conference, 2017
Modern gas turbine engines require highly effective effusion cooling system for protection of com... more Modern gas turbine engines require highly effective effusion cooling system for protection of combustor liners. To enhance the performance of effusion cooling, a new design concept of grooves is presented in this paper. In this new concept, rectangular grooves are created along the mainstream flow path and the effusion cooling holes are embedded in these grooves. The objective of the present study is, to assess the usefulness of groove concept in improving the cooling performance of simple cylindrical holes used in effusion cooling and perform a parametric study to examine the effects of design parameters of a groove on cooling effectiveness so as to find the optimum dimensions of a groove for which cooling effectiveness is maximum. In the present study, a simple flat plate model and seven grooved plate models are considered for analysis. In grooved plates, the groove shape is defined by two geometric parameters viz. width and depth. To study the effect of design parameters of grooves on cooling effectiveness, various groove widths and depths are considered for analysis. In this study, average cooling effectiveness obtained by seven grooved plates having different groove configuration are compared amongst themselves and with the simple plate. Numerical simulations have been performed at three different blowing ratios 1, 2 and 3 for all cases using ANSYS Fluent and the flow field is solved by using k-ε realizable turbulence model. In addition, an experimental investigation is carried out on simple and grooved test plates in order to benchmark the reliability of CFD results. Experiments were conducted in subsonic wind tunnel at mainstream Reynolds number of 120000 based on hydraulic diameter of the test section. Steady state cooling effectiveness measurements are obtained by using IR thermography technique. The results showed that the lateral averaged cooling effectiveness increased remarkably when grooves are incorporated into the effusion cooling system. This increase was mainly due to reduced jet lift-off and reduced coolant mainstream interaction near hole exit. Variation in the dimensions of the grooves also greatly affected the cooling performance.
Abstract— Alcohols, basically ethanol is considered as a leading alternative fuel for automotive... more Abstract— Alcohols, basically ethanol is considered as a leading alternative fuel for automotive application because of its ability to reduce the air pollution and cost of the fuel. This project investigates the effect of lower ethanol gasoline blends (up to 30% by volume) on performance and emission characteristics of the single cylinder four stroke S.I. engine. Tests were carried out for power, fuel consumption and exhaust emissions for CO and HC atgenerator speed of 1200 rpm to 1500 rpm. Results werecompared with the pure gasoline.
This paper presents a new design concept to increase the adiabatic effectiveness of cylindrical h... more This paper presents a new design concept to increase the adiabatic effectiveness of cylindrical holes used for film cooling in gas turbine. Rectangular grooves are created at the downstream of each cylindrical hole. The grooves are incorporated into the film cooling system to reduce the adverse effects of the kidney vortices since the kidney vortices reduce the effectiveness of circular cross-section film cooling holes at moderate to high blowing ratios by inducing jet lift-off. The groove shape is defined by two geometric parameters viz. width and depth. A single row of five discrete film cooling holes on a flat plate with an inclination angle of 30° along streamwise direction and pitch to diameter ratio of 2 was chosen as the baseline test case. In this study, cooling effectiveness curves obtained by four grooved plates having different groove configuration is compared amongst themselves and with the simple plate. Numerical simulations have been performed at three different blowing ratios of 0.5, 1.0 and 1.5 for each case of the rectangular groove and simple plate by using CFD technique (ANSYS Fluent) and the flow field is solved by using k-ε realizable turbulence model. The results showed that the lateral averaged cooling effectiveness is increased remarkably when the downstream rectangular grooves are present. This increase is because of the fact that, in grooved plates, majority volume of the coolant is flowing within the grooves, so it is properly guided and protected by the grooves. This reduced the turbulent mixing between mainstream and coolant flow. Another reason is that side walls of the groove do not allow hot mainstream gasses to enter underneath coolant jet from the sideways. This reduced the jet lift-off and improved the cooling effectiveness. Apart from this, the effects of each geometrical parameter of the groove on the film cooling effectiveness were studied in detail and observed that average cooling effectiveness distribution is higher for grooves with least aspect ratio for low blowing ratio. Numerical Simulation to Investigate Effect of Downstream Grooves on Film Cooling Effectiveness of Gas Turbine Blades