The Experts below are selected from a list of 15138 Experts worldwide ranked by ideXlab platform
Luis Le Moyne - One of the best experts on this subject based on the ideXlab platform.
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Development and validation of a 5 Stroke Engine for range extenders application
Energy Conversion and Management, 2014Co-Authors: Alan Kéromnès, Bernard Delaporte, G. Schmitz, Luis Le MoyneAbstract:A 5-Stroke turbo-charged port-injection spark-ignition Engine has been developed in the present study for use as a range extender or series-hybrid main power source. The development and the design of the Engine are based on 0D/1D model and experimental results have been compared with the Engine model. The 5-Stroke Engine is a three-cylinder in which two cylinders perform a four-Stroke cycle and alternatively a second expansion of the burnt gases is performed in the third cylinder. The boost pressure delivered by the turbocharger is controlled by a particular innovative system called “smart wastegate”, different from a conventional wastegate, consisting in a variable valve timing of the two exhaust valves of the low pressure cylinder. The Engine develops up to 40 kW for a speed range of 3500–4500 rpm. BSFC is 226 g/kW.h which corresponds to a fuel conversion efficiency of 36.1%. This efficiency can be achieved for an Engine speed of 4000 rpm and a brake power of 32.5 kW, which are notable scores for an MPI two-valve per cylinder Engine. Expected optimum should be below 217 g/kW.h BSFC and over 90 N.m torque. The Engine has been tested over a wide range of conditions; model predictions and experimental results are compared and combustion efficiency increase discussed.
Davinder Kumar - One of the best experts on this subject based on the ideXlab platform.
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effect of Engine parameters on in cylinder flows in a two Stroke gasoline direct injection Engine
Applied Energy, 2016Co-Authors: Addepalli S Krishna, J M Mallikarjuna, Davinder KumarAbstract:Abstract This paper deals with the in-cylinder flow field analysis in a two-Stroke Engine under motoring conditions by particle image velocimetry (PIV) and computational fluid dynamics (CFD). The main objective is to analyze the effect of Engine parameters viz., Engine speed, compression ratio (CR) and port orientation on the in-cylinder flows in a loop-scavenged two-Stroke gasoline direct injection (GDI) Engine, with an aim to help researchers to design fuel efficient and less polluting two-Stroke Engines. In this study, a single-cylinder 70 cm 3 two-Stroke Engine which is very commonly used for the two-wheeler application, is considered. The Engine cylinder is modified to provide optical access into the in-cylinder region. The PIV experiments are conducted at various Engine speeds viz., 500, 1000 and 1500 rev/min, and the plane averaged velocity vector fields obtained, are analyzed to understand the in-cylinder flow behavior. The CFD study is also carried out using the commercial CFD code, STARCD, to study and compare the in-cylinder flow parameters at various Engine operating conditions. The CFD results are compared with the experimental results to the extent possible. The CFD predictions are found to be in good agreement with the experimental results. Therefore, the CFD analysis has been extended further to understand the effect of various Engine parameters on the in-cylinder flows. We found that the turbulent kinetic energy and tumble ratio increased by about 25% and 20% respectively, when the Engine speed was increased from 1000 to 1500 rev/min. Also, we found that the turbulent kinetic energy and tumble ratio decreased by about 13% and 26% when the compression ratio was increased from 7 to 8. In addition, we found that the port orientation, rather than port areas had a greater influence on the in-cylinder flow parameters.
Alan Kéromnès - One of the best experts on this subject based on the ideXlab platform.
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Development and validation of a 5 Stroke Engine for range extenders application
Energy Conversion and Management, 2014Co-Authors: Alan Kéromnès, Bernard Delaporte, G. Schmitz, Luis Le MoyneAbstract:A 5-Stroke turbo-charged port-injection spark-ignition Engine has been developed in the present study for use as a range extender or series-hybrid main power source. The development and the design of the Engine are based on 0D/1D model and experimental results have been compared with the Engine model. The 5-Stroke Engine is a three-cylinder in which two cylinders perform a four-Stroke cycle and alternatively a second expansion of the burnt gases is performed in the third cylinder. The boost pressure delivered by the turbocharger is controlled by a particular innovative system called “smart wastegate”, different from a conventional wastegate, consisting in a variable valve timing of the two exhaust valves of the low pressure cylinder. The Engine develops up to 40 kW for a speed range of 3500–4500 rpm. BSFC is 226 g/kW.h which corresponds to a fuel conversion efficiency of 36.1%. This efficiency can be achieved for an Engine speed of 4000 rpm and a brake power of 32.5 kW, which are notable scores for an MPI two-valve per cylinder Engine. Expected optimum should be below 217 g/kW.h BSFC and over 90 N.m torque. The Engine has been tested over a wide range of conditions; model predictions and experimental results are compared and combustion efficiency increase discussed.
Vince Dugue - One of the best experts on this subject based on the ideXlab platform.
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analysis of the combustion process pollutant emissions and efficiency of an innovative 2 Stroke hsdi Engine designed for automotive applications
Applied Thermal Engineering, 2013Co-Authors: Jesus Enajes, Ricardo Novella, Daniela De Lima, Pascal Tribotte, Nicolas Quecho, Philippe Obernesse, Vince DugueAbstract:On the last years Engine researchers has been focused on improving Engine efficiency in order to decrease CO2 emissions and fuel consumption, while fulfilling the increasingly stringent pollutant emissions regulations. In this framework, Engine downsizing arises as a promising solution, and 2-Stroke cycle operation offers the possibility of reducing the number of cylinders without incurring in NVH penalties. An experimental investigation has been performed to evaluate the performance of a newly-designed poppet valves 2-Stroke Engine, in terms of finding the proper in-cylinder conditions to fulfill the emission limits in terms of NOx and soot, keeping competitive fuel consumption levels. Moreover, present research work aims to improve the existing knowledge about the gas exchange processes in a 2-Stroke Engine with poppet valves architecture, and its impact over the combustion conditions, final exhaust emissions levels and Engine efficiency. The experimental results confirm how this Engine architecture presents high flexibility in terms of air management control to substantially affect the in-cylinder conditions. The in-cylinder oxygen concentration and density, which are the product of a given trapping ratio and delivered mass flow, were linked to pollutant emissions and performance by their impact on instantaneous adiabatic flame temperature and spray mixing conditions. After the optimization process, it was possible to minimize simultaneously NOx, soot and indicated fuel consumption, without observing a critical trade-off between the pollutant emissions and the fuel consumption.
Mohammad H Dado - One of the best experts on this subject based on the ideXlab platform.
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performance simulation of a four Stroke Engine with variable Stroke length and compression ratio
Applied Energy, 2004Co-Authors: Jehad A A Yamin, Mohammad H DadoAbstract:The Engine consists of a coupled four-bar, slider-crank and inverted slider-crank mechanisms. The variations in Stroke length and compression ratio are obtained through varying the location of the pivot of the four-bar rocker arm. The Engine power characteristics are based on the power cycle of the piston inside the cylinder. Several pivot locations are considered giving a range of Stroke lengths and corresponding compression ratios. A simulation model is developed and verified with experimental results from the literature for both constant and variable-Stroke Engines. The simulation results clearly indicate the advantages and utility of variable-Stroke Engines in fuel-economy issues.
