CO₂冷凍サイクル用エジェクターの駆動ノズル部流れの速度計測

抄録

For the optimum design of two-phase flow nozzle of CO₂ two-phase flow ejector, it is important to investigate fluid mechanics of high-speed gas-liquid two-phase flow. The purpose of this study is to investigate CO₂ two-phase nozzle flow in view of both experimental and analytical aspects. In the experiment, CO₂ in supercritical pressure condition was blown down into atmosphere through a divergent-convergent nozzle, where the mainstream profile of temperature was measured. Furthermore, velocity measurements of nozzle flow were conducted using by PIV system. Experimental data of both temperature and velocity show that the nozzle flow is considered to be supersonic flow. The experimental values of velocity are found to locate between the gas velocity and the liquid velocity of the 1-dimensional analysis by Kinoue et al.