为了提高液化石油气（LPG）内燃机的动力性能,揭示LPG内燃机燃烧过程中化学能、机械能和热能之间的关系,以某型号的LPG内燃机为对象,通过LPG准维双区燃烧原理的分析,建立了LPG内燃机准维双区燃烧模型.通过对燃烧模型的仿真,获得了气缸压力、已燃混合气温度与曲轴转角的关系曲线,并与LPG内燃机的实验结果进行比较,发现误差不超过5%,表明此燃烧模型能够准确地反映LPG内燃机燃烧过程的气缸压力和已燃区温度随曲轴转角的变化.

In order to improve the dynamic performances of liquefied petroleum gas（LPG） engine and reveal the relationship between the thermal energy and the chemical energy as well as the mechanical energy during combustion,the quasi-dimensional two-zone combustion mechanism is analyzed,with a certain LPG engine as the research objective.Then,a quasi-dimensional two-zone combustion model is put forward,and the curves of crank angle versus cylinder pressure and burnt mixture temperature are obtained by simulation.Finally,the curves are compared with the experimental ones,and the error is found to be only less than 5%.Thus,it is concluded that the proposed combustion model well describes the variations of cylinder pressure and burnt mixture temperature of LPG engine with crank angle.