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本文是试验研究模拟增压内燃机进气管中空气动力现象,探讨压力波传播规律,以便进一步研究进气管中脉动气流对增压压气机性能的影响和内燃机充气过程的影响。文中利用一元不稳定运动理论特性线图解方法在模拟的增压系统中风机和进气阀边界条件上进行几种方案针算,得到风机出口和进气阀等处压力、流量的变化规律。并从相似原理总结了上述边界条件下压力波传播的相似准则数——周波数(每循环中压力波往返次数)。并找出此相似准则和压力波振幅的关系。我们利用了小惯性压力传感器和压力定量器,通过动态应变仪-阴极示波器系统测定了脉动压力的规律。试验结果与理论分析基本相符,从而得到对增压内燃机进气系统中压力波规律的若干结论。
This paper is an experimental study to simulate the aerodynamic phenomenon in the intake manifold of a supercharged internal combustion engine, and discusses the pressure wave propagation law in order to further study the influence of the pulsating airflow in the intake pipe on the performance of the turbocharged compressor and the inflation process of the internal combustion engine. In this paper, several schemes of needle pressure calculation are used to simulate the boundary conditions of the fan and the intake valve in the simulated turbocharged system, and the variation rules of the pressure and the flow at the outlet of the fan and the intake valve are obtained. Based on the similar principle, the number of similar criteria for pressure wave propagation under the above boundary conditions is summarized - the number of cycles (the number of round trips of pressure waves per cycle). And find out the relationship between this similar criterion and pressure wave amplitude. We use a small inertial pressure sensor and pressure doser, through the dynamic strain gauge - cathode oscilloscope system measured pulsating pressure law. The experimental results are in good agreement with the theoretical analysis, and some conclusions about the law of pressure wave in the intake system of supercharged internal combustion engine are obtained.