配气阀结构参数对活塞凸轮发动机性能的影响

为了研究配气阀结构参数对活塞凸轮发动机性能的影响，使用瞬态分析方法建立了发动机缸内热力过程的数学模型，并通过计算机仿真分析了各配气阀结构参数对发动机性能的影响。研究结果表明，配气机构的气道孔直径大于某一定值后，其对凸轮活塞发动机耗量和指示功率影响较小；在保证功率的前提下，减小进气角可以提高发动机的经济性；选择使活塞在回行开始时缸内压力降到背压值的预排气角，可以提高发动机的动力性；最佳的压缩角、预进气角可以通过本文的计算模型从多种方案中优选得到。

Effect on the performance of piston cam enginewith the parameters of valve mechanism

In order to investigate the effect on the performance of piston cam engine by the valve parameters, the instantaneous state analysis method is used to model the thermal process in cylinder and that is analyzed through computer simulation. The researching results indicate that the aperture of the air hole have little effect on performance of the piston cam engine when it is greater than a certain value; economy can be increased by decreasing intake angle on the premise of power need; power can be increased by decreasing the pressure of cylinder to back pressure at time of piston begin to get back; the forehead intake angle and compress angle for optimum power and economy can be get by comparing to different simulation results.