评估二冲程发动机扫气特性的新方法

A NEW METHOD OF EVALUATING TWO-STROKE ENGINE SCAVENGING CHARACTERISTIC

本文介绍了在稳流试验台上利用三孔探针测量二冲程发动机缸内γ-φ平面上的气流流动状况。取得了缸内γ-φ平面上气流流动特性与发动机性能之间的一些关系。装有两种不同形式扫气道的发动机性能试验表明:利用γ-φ平面扫气图和γ-φ平面内气流速度可以预测扫气特性。

The gas flow in the cylinder on γ-φ plane for two-stroke engine is mea- sured on steady flow testing rig by a three-hole probe in this paper. Some relationships between scavenging flow characteristic on γ-φ plane and engine performance are obtained. The results of firing test on one engine with two engine cylinders of differing scavenging layouts show that scavenging characte- ristic may be predicted by means of γ-φ plane scavenging figure and γ-φ plane gas velocity.