一、前言流经喷咀的压缩性流体的特征之一,是当喷咀喉部前后的压力比小于临界压力比时,流经喉部的流体速度达到声速,可以得到稳定的质量流量。这时,必须注意喉部上流侧的气体压力和温度应保持一定,同时下流侧的压力应保持在临界压力比以 I. INTRODUCTION One of the characteristics of the compressive fluid flowing through the nozzle is that when the pressure ratio before and after the throat of the nozzle is less than the critical pressure ratio, the velocity of the fluid flowing through the throat reaches the speed of sound and a stable mass flow rate can be obtained. At this time, we must pay attention to the upper throat gas pressure and temperature should be maintained at the same time downstream side of the pressure should be maintained at critical pressure ratio to