大气湿度对发动机换算转速的影响

Effect of Atmospheric Humidity on Engine Corrected Speed

实践表明 ,大气湿度的变化对发动机性能及其工作特性有一定的影响。这种影响在高湿度高海拔地区地面试车时更明显。大气湿度对发动机换算转速影响的物理本质是随着湿度的变化使进入发动机的空气热物理性质也发生了变化。在分析这种影响的基础上 ,利用相似原理推导出换算转速的大气湿度修正系数 ,并对某系列发动机经湿度修正与不经湿度修正的换算转速做了比较。

Variation of atmospheric humidity has been proved effective on engine behavior and performance. It is more obvious when engines are tested in high humidity and high altitude areas. The physical nature of humidity effects on engine corrected speed is that thermophysical characteristics of air entering engine varies with humidity. Analyzing the effect and using similar principles, atmospheric humidity conversion coefficient has been deduced for corrected speed. Comparison between speed with and without humidity correction has also been completed.