某航空活塞发动机机械增压器旁通阀门开启特性分析

机械增压器现已在汽车发动机上得到了广泛应用,但其在航空活塞发动机上的应用和研究较少.分析机械增压器的工作过程,在簧片阀模型的基础上,考虑旁通阀门启闭压力与涡轮增压器压比之间的线性关系并对其建模;搭建某型航空活塞发动机GT-POWER数值仿真模型并进行实验验证,在整机模型的基础上,研究不同转速下通过旁通阀门的质量流率以及不同高度下旁通阀门的通流面积.结果表明:巡航工况下,海拔2680 m时阀门关闭;起飞工况下,海拔3000 m阀门关闭,该结果可为发动机实际高空飞行提供理论支持.

Analysis of bypass valve opening characteristics for supercharge in aviation piston engine

Supercharger is widely used in vehicle engines because of its good response characteristics while the application in aircraft piston engines is still very rare. The working process of the supercharger was analyzed, and the linear relationship between the opening and closing pressure of the bypass valve and the turbocharger pressure ratio is modeled on the basis of the reed valve model. The GTPOWER numerical simulation model of a certain type of aero piston engine was established and confirmed. Based on the whole model, the mass flow rate of the bypass valve and the flow area of the bypass valve at different heights were studied. The results show that under the cruise condition, the valve is closed at 2680m above sea level, and the valve is closed at 3000m above sea level under taking off condition which confirm the accuracy of the model provides the theoretical basis for the actual high altitude flight of the engine