Study on The Effect of Two-stroke Engine Exhaust Resonance on Ventilation of Aero-piston
This article compares the effects of three types of exhaust system resonance states on engine performance and ventilation effi-ciency of an aviation piston two-stroke engine,namely direct exhaust,direct exhaust gradually expanding,and gradually expanding gradually contracting,based on one-dimensional flow simulation of GT Power.The results indicate that three different exhaust system resonance states have a significant impact on the engine ventilation efficiency;Compared to the straight exhaust and straight exhaust gradually expanding forms,engines using gradually expanding gradually contracting forms exhibit better performance at high and medi-um low speeds;Reasonable exhaust resonance improves the trapping ratio and scavenging efficiency by increasing the average back pressure,thereby affecting the fuel consumption and performance of the engine.
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