The petrol engine has, due to its throttled air intake, a large range of variation in exhaust mass flow compared to the Diesel engine.

由于进气口的限流，相比柴油发动机，汽油发动机的排气流量有大范围的变化。

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By means of the tuning chamber, the tuning speed range of exhaust system is widened. Thus, the two-stroke petrol engine performance at the middle-low speed range can be improved.

本文采用加装排气调谐腔的方法，拓宽了摩托车用二冲程汽油机排气系统的调谐转速范围，有效地改善了发动机在中低速区的性能。

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The characteristic method was used in simulating computation of non steady gas flow process in the exhaust system of model 15a petrol engine.

针对15 A型二冲程汽油机排气系统的流动过程进行了模拟计算，对计算中某些边界条件的计算方法进行了探讨。

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