| Summary: | 碩士 === 國立臺灣科技大學 === 機械工程系 === 97 === The location of injector & spark plug and injector inclination angle for a single cylinder, four-valve, 500 c.c. displacement motorcycle engine is designed in considering different kind of fuel injection mode (stratified charge, two-stage charge and homogeneous charge) by using a commercial software package of CFD (Computational Fluid Dynamics) code — STAR-CD. Confer tumble motion of in-cylinder flow circles cylinder radius and the interaction of spray flow field and flow motion in GDI, and understand the influence for fuel injection on flow field by the relation of velocity flow field and average volume tumble ratio. The trajectory of in-cylinder fuel injection derivatives with time can be an important reference for designing GDI engine. Therefore when designing GDI engine, first calculate the motion of in-cylinder flow and the derivation of droplot spray, and using the result can be an important target, and then proceed the test of engine performance parameter to find the optimum parameter of injection timing and spark timing, then reduce time and money for the first stage to design the GDI engine.
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