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Taku Tsujimura,Kaoru Nakatani,Shohei Mikami,Yoshiroh Tokunaga,Jiro Senda,Hajime Fujimoto 한국자동차공학회 2001 한국자동차공학회 Symposium Vol.- No.-
We focused on the hydrogen fueled, direct-injection diesel engine in an inen gas circulation type co-generation system which had been proposed by WE-NET project. In this study, chemical kinetic analysis with a detailed chemi-cal kinetic model for hydrogen was conducted to understand the characteristic of auto-ignition phenomena with investigating the effects of temperature, pressure, fuel concentration, and third body concentration in hydrogen mixture on auto-ignition delay time. It was found that temperature of mixture had a strong effect on auto-ignition delay especially at less than 1100 K. It is found that richer mixture ignites earlier, and that the increase in third body concentration causes the increase in auto-ignition delay time because third body dilutes chemical species related with auto-ignition. Moreover as supposed that mixture is formed in a cylinder by means of direct-injection method, it is clarified that third body concentration and temperature in the mixture vary with the change in equivalence ratio of the mixture, and it can be supposed that leaner mixture spontaneously ignites earlier because temperature of lean mixture is higher than one of rich mixture.<br/> <br/>