多缸内燃机单缸充气效率的测定

The Measurement of Individual Cylinder Volumetric Efficiency for Multi-Cylinder Engine

本文提出了测量多缸机单缸充气效率的两种方法:流速—压力波法和压力波法。应用流速—压力波法,须测量各缸进气歧管靠近进气门处的平均流速波和同一测量截面的压力波;而压力波法,须测量进气门前后的压力波。文中阐述了两种方法的测量方案和计算原理,并列出了计算公式。试验研究表明,两种方法的测量结果显示出良好的一致性,各缸充气效率的平均值也与整机充气效率的实测值相符。可作为一种新手段判断多缸机各缸进气充量的均匀性。

In this paper two methods for measureing the individual cylinder volumetric efficiency of multi-cylinder engine were proposed: the velocity-pressure wave method and pressure wave method. The velocity-pressure wave method requires the measurement of both the average velocity wave and the pressure wave of intake manifold near the valve at the same cross section; and as to the pressure wave method, the pressure wave before and after the intake valve must be measured. In this paper, the measureing setup and principle of calculation as well as calculation formula of two methods were described. The investigation indicated that the test results of two methods were generally in good agreement, and the mean value of volumetric efficiency of each individual cylinder were consistent with the measured value of the engine. It can be a new way to be used for judging the intake charge evenness of individual cylinder in multi-cylinder engine.