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1.前言利用活塞式发动机进排气管系内产生的压力波动提高发动机进排气效率,并由此提高其功率,这个问题早为人们所注意,并见之于许多研究中。在这类研究中就定性而言,是以声学理论为基础,从管系内压力波的传播速度近似于平均音速,以及压力波的往复次数与发动机转速间的调谐关系出发,鸟本和福田分别由惯性效应和脉动效应提出了各自的谐调次数。不论哪一种方法,为使扫—排气效率得以提高,总是
1. Introduction The use of piston engine intake and exhaust pressure fluctuations generated within the system to improve engine intake and exhaust efficiency, and thus increase its power, this issue has long been noted and found in many studies. In this type of research, qualitatively speaking, based on acoustic theory, the pressure wave propagation velocity in the piping system is similar to the average speed of sound and the relationship between the reciprocating frequency of the pressure wave and the engine speed. Respectively by the inertia effect and pulsation effect put forward their own harmonic frequency. Either way, in order to improve sweep-exhaust efficiency, always