1.引言在脉冲增压系统的草图设计阶段,必须合理地选择排气管内径的尺寸。里卡多公司的6号设计资料(DP78/1005)中指出,为了获得最佳性能,排气管的截面积似应选取为气门最大几何通流面积的0.8～1.2倍。例如,某一发动机的气门盘直径为92毫米,气门座内径为83毫米,气门升程为22毫米,如果上述比值取为1:1(平均值),则排气管内径应为118毫米。另外一种意见认为,排气管内径可以大大 1. INTRODUCTION In the draft design phase of a pulse booster system, the dimensions of the exhaust pipe internal diameter must be chosen reasonably. Ricardo’s Design Document No. 6 (DP78 / 1005) states that for best performance, the cross-sectional area of ​​the exhaust pipe should be chosen to be 0.8 to 1.2 times the maximum geometric flow area of ​​the valve. For example, an engine has a valve disc diameter of 92 mm, a valve seat internal diameter of 83 mm and a valve lift of 22 mm. If the ratio is taken as 1: 1 (average), the exhaust pipe internal diameter should be 118 mm. Another opinion that the exhaust pipe diameter can be large