气-液喷射器内两相流流型分析

对水平安装气-液喷射器内两相流流型进行了分析研究。根据圆管内气-液两相流流型转变的经验准则式，结合气-液喷射器性能方程，得出了气-液喷射器内环状流和雾状流的流型区间。以空气-水喷射器为例，给出了喷嘴出口当地最大马赫数与引射流体入口／出口压比的关系式，证明了当工作气体（空气）在喷嘴中作超临界膨胀时，喷射器内流型至少为环状流。

Analysis of Inner Flow Patterns in Gas-Liquid Ejectors

The flow pattern in the choke of the horizontally installed gas-liquid ejector was studied. According to flow pattern criterion equations in horizontally installed pipes, and combining with the performance equation of gas-liquid ejectors, the transition intervals of annular flow and mist flow in the ejector were obtained. Further, the critical equation of annular flow in air-water ejector was discussed amply, and the relationship between the maximum local Mach number at the outlet of the nozzle and the inlet/outlet pressure ratio of the second fluid was obtained. A conclusion was deduced that the inner flow pattern in air-water ejectors was annular at least, when the gas (air) expanded supercritically in the nozzle.