二酸化炭素高速気液二相ノズル流れの研究

（実験と１次元解析の比較）

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 blow down into atmosphere through a divergent-convergent nozzle, where the mainstream profile of temperature and the jet force at nozzle exit were measured. In the analysis, one-dimensional model which assumes steady, adiabatic, frictionless, and equilibrium was proposed. The flow in the nozzle of convergent part was treated as single-phase flow, whereas the flow in the nozzle of divergent part was treated as separated two-phase flow with saturation. Although this analysis is quite simple, the analytical results can follow the experimental results well within the cases in this study.