Abstract
A computer program has been developed to predict the engine performance characteristics through the analysis of the flow in the intake and exhaust systems and of the cylinder combustion phenomena for the MPI spark ignition engines. Using the program, a study for the optimal design of the intake system has been performed by varying the factors which can influence the volumetric efficiency, such as the volume of the plenum chamber, the length of the intake manifold and the pipe length between the surge tank and the plenum chamber. Experimental tests have also been carried out to obtain the transient pressure history in the intake manifold and the cylinder, and the variations of volumetric efficiency over the various engine speeds. The result of simulation has been compared with that of experimental test, and the optimal design data for the test engine could be found. The comparison of volumetric efficiency shows good agreement between the simulation and experiment.
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