Abstract
For the optimum design of two-phase flow nozzle of CO_2 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 CO_2 two・phase nozzle flow in view of both experimental and analytical aspects・In the experiment, CO_2 in supercritical pressure condition was blow down into atmosphere through a divergent-convergent nozzle, where the mainstream profile of temperature was measured. As for the experimental temperature decrease in the nozzle, the temperature decrease for 27 0C of ambient temperature is much larger than the one for 17 ℃ of ambient temperature.Analytical values of temperature or pressure profile along the nozzle agree with the experimental values for 27 0C of ambient temperature, whereas analytical values are lower than the experimental values for 17 0C of ambient temperature. Furthermore, it is experimentally investigated that the cases of pressure increase in the flow direction shows the characteristics of supersonic flow.
