1836 Numerical Investigation of Optimum Liquid Fuel Split-Injection in a Combustion Chamber

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Effects of diesel fuel split-injection on fuel-air ratio and gas velocity distributions inside a combustion chamber are studied numerically using a modified code of KIVA. This study is intended to find optimum liquid fuel split-injection configuration. It is found that, among all schemes evaluated, the configuration where 75% of fuel mass is injected on the first injection and the remaining is injected 1.0ms after the end of the first injection is preferred as the optimum configuration that can contribute to particulate emission reduction. It is also found that dwell durations do not have a strong correlation with the flammable area formed due to the fuel injections and longer dwells delay the effect of the second injection on gas velocity profile and postpone the utilization of effective time for taking advantage from second injection.
2007-09-07