Micro-GA optimization analysis of the effect of diesel injection strategy on natural gas-diesel dual-fuel combustion

摘要: Abstract In this work, a comprehensive evaluation was conducted to study the effect of diesel injection strategy on natural gas-diesel dual-fuel combustion using micro genetic algorithm (micro-GA) optimization. Firstly, effects different strategies with same chamber were studied under multiple operating conditions. The results showed that for double strategy, over 45% thermal efficiencies can be obtained within constraints peak pressure, pressure rise rate, and NOx emission all For single achieved at low medium loads are above 45%, while high load only reach 35.5%. Higher loss heat transfer responsible decreased efficiency injection. Secondly, designs further investigated. It fixed condition, percent energy substitution exhaust gas recirculation fraction efficient clean not varied design, timing split ratio should carefully selected. Although ignition processes different, bulk characteristics engine performance similar. difference in between configurations is attributed transfer. With could use simpler design lowers improvement efficiency.