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应用Chemkin化学动力学软件包中的Senkin模块模拟了正庚烷在多孔介质发动机中的燃烧过程.通过修改Senkin程序,结合了Woschni传热模型和多孔介质换热模型,并在正庚烷详细氧化机理中加入氮氧化物的生成机理,将此程序纳入发动机燃烧的零维单区模型.对多种工况参数进行计算,讨论了运行参数对发动机性能的影响.当进气温度、压缩比增大,或过量空气系数降低时,多孔介质发动机着火时刻会明显提前.结果表明:多孔介质对混合气具有预热作用可强化发动机的点火燃烧,多孔介质的初始温度是决定压燃点火的决定性因素.
The combustion process of n-heptane in porous media engine was simulated by using Senkin module in Chemkin chemical kinetics package.By modifying the Senkin program, Woschni heat transfer model and porous media heat exchange model were combined, Mechanism into the formation mechanism of nitrogen oxides, this program into the engine combustion zero-dimensional single-zone model.Considering a variety of operating conditions parameters, discussed the operating parameters of the engine performance.When the intake air temperature, compression ratio increased Large or excess air coefficient is reduced, the ignition timing of the porous medium engine is obviously advanced.The results show that the preheating effect of porous medium on the mixture can enhance the ignition and ignition of the engine, and the initial temperature of the porous medium is the decisive factor in determining the ignition of ignition .