高速二相流ノズルにおけるシャドウグラフ法を用いたイソブタン冷媒の液滴速度測定

抄録

While it is desired to use natural refrigerants with low global warming potential, one method to improving the performance of the natural refrigerant cycle is the use of an ejector. In this research, we have been developing a high efficiency nozzle under low flow rate conditions to applying it to the ejector cycle of natural refrigerant, Isobutane. In this report, droplet velocity obtained by the visualization experiment in the nozzle using Shadowgraphy. And compared with the velocity distribution obtained from pressure distribution. It was confirmed that the droplet velocity was about 20% slower than the average velocity of the two-phase flow and droplet velocity was not accelerated much.