Combustion in direct injection diesel engine is closely related to the transient behavior of the fuel air mixing processes, including atomization and vaporization at the spray edge. Design of IC engine is the complex in fluid dynamics of turbulent reacting flows inside the engine cylinder and piston bowl. This were carried for in cylinder flow analysis using Ansys 14.5 for two shapes of the piston bowl of Spherical bowl (SB) and Toroidal bowl (TB) in a single cylinder compression ignition engine. The air swirl is initiated inside the cylinder by the design of inlet manifold, inlet valve in addition to shape of the piston bowl. The cylinder flow parameters swirl motion, in cylinder flow motion, velocity and temperature contour have been analyzed. The air and fuel mixture is to take complete combustion in cylinder flow motion for tumble and turbulent created by the centre of piston bowl shape. The two dimensional, thick spray model to analyze fuel vaporisation in the spherical bowl chamber of DICI engine showed that an increase in the vaporisation rate does not necessarily imply an increase in the fuel-air mixing rate. Also showed that vaporisation of fuel and combustion in spherical bowl can be controlled by mixing rather than toroidal bowl.

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