CFD Analysis of Performance and Emission in a Direct Injection Diesel Engine at Different Piston Bowl Re-Entrant Angle
Journal Title: GRD Journal for Engineering - Year 2017, Vol 2, Issue 7
Abstract
The present works investigates the influence of re-entrant angle in a piston bowl geometry on both engine performance and combustion efficiency in a direct injection (DI) diesel engine using STAR-CD. The analysis was done by varying the reentrant angle of piston bowl between 16.35˚ to 25.35˚. All the other relevant parameters namely, compression ratio, bowl volume, squish clearance, engine speed and the mass of fuel injected were kept constant. It is observed that the in-cylinder pressures and temperatures are higher for 19.35˚ reentrant angle. NOx emissions were observed higher for 22.35˚ reentrant angle. Lower soot emissions were observed for 19.35˚ reentrant angle when compared with the other reentrant angles. The simulation analysis revealed that 19.35˚ reentrant angle is the optimum reentrant angle yielding best performance and lower emissions for the chosen engine geometry. Higher turbulent energy and velocity magnitude levels are obtained with 19.35˚ reentrant angle indicating efficient combustion emphasizing the need for optimized combustion chamber geometry for better performance and emissions.
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