CFD Simulation Of Direct Injection CI Engine With Flat Piston Bowl And W Shape Toroidal Piston Bowl Combustion Process

摘要

Flow fields are generated prior to combustion in internal combustion engines during the induction process in suction stroke and they undergo changes during the compression stroke. It is very essential to understand the fluid motion during suction and compression strokes for developing new engine designs with the best performance and emission characteristics. Therefore, computational studies have been carried out to comprehend the role of in-cylinder flow structure. In this 3D CFD, Ansys Forte V18 is used to study the incylinder fluid motion and performance and emissions of the direct injection compression ignition engines with flat piston bowl and W shape toroidal piston bowl. The validation of the CFD results with the experimental results available for flat piston bowl. The optimization of the bowl geometry for W shape toroidal piston bowl with constant compression ratio has been carried out by varying the central pip height and toroidal radius. The obtained results are plotted during the compression stroke and expansion strokes and are analysed. The results showed that, the bowl shapes plays a significant role in the incylinder fluid motion, performance and emissions of compression ignition engines. It controls the fuel-air mixing and burning rates in compression ignition engines..