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根据活塞动力学方程和热力学方程,建立了直线氢内燃机零维数值计算模型,获得了直线氢内燃机活塞运动学特点.通过耦合零维动力学模型和燃烧室动网格模型,建立了直线氢内燃机燃烧过程CFD模型,对比传统氢内燃机和直线汽油发动机,分析了直线氢内燃机工作过程性能状况.仿真计算结果表明:与传统氢内燃机相比,直线氢内燃机燃烧持续期较长,最高燃烧压力和平均温度均较小,这有利于控制NO排放,但燃烧等容放热量较少,后燃较严重,指示效率较低;相对于直线汽油机,直线氢内燃机燃烧过程火焰传播速度快,燃烧持续期较短,指示效率较高.
According to the kinetic equation of piston and the thermodynamic equation, a zero-dimensional numerical calculation model of linear hydrogen internal combustion engine is established and the piston kinematics characteristics of the linear hydrogen internal combustion engine are obtained. By coupling the zero-dimensional dynamic model with the moving grid model of the combustion chamber, Compared with the traditional hydrogen internal combustion engine and the linear gasoline engine, the performance of the linear hydrogen internal combustion engine is analyzed. The simulation results show that, compared with the conventional hydrogen internal combustion engine, the combustion duration of the linear hydrogen internal combustion engine is longer, the maximum combustion pressure and the average The temperature is small, which is conducive to the control of NO emissions, but the combustion isothermal heat less, after burning more serious, indicating the efficiency is low; Relative to the linear gasoline engine, linear hydrogen combustion engine combustion process flame propagation speed, combustion duration Short, indicating a higher efficiency.