Abstract ▼ AI-Helper

This paper describe a simulation model for the flow analysis of intake and exhaust manifolds of 4 cycle 4 cylinder diesel engine, assuring the flow as one dimensional unsteady problem. For the above gas exchange process calculation, the two step Lax Wendroff method was used and for the combustion an...

This paper describe a simulation model for the flow analysis of intake and exhaust manifolds of 4 cycle 4 cylinder diesel engine, assuring the flow as one dimensional unsteady problem. For the above gas exchange process calculation, the two step Lax Wendroff method was used and for the combustion analysis in the cylinder to find the pressure and temperature, the single zone model which was proposed by Whitehouse and Way, was used. Here four chemical species was considered to be present in the combustion products. For the pressure calculation at the branches of intake and exhaust manifolds, Constant pressure mixing model was applied, which accounted the interaction of pressure between cylinders. The following results are obtained on this numerical analysis ; (1) There exsits an optimum intake manifold length for maximum volumetric efficiency for the specified engine speed. (2) When the reflective pressure wave of expansion wave due to the opening of the intake valve reached the intake valve side with the positive maximum value just before the intake valve closed, the volumetric efficiency became maximum.

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