先細末広ノズル内での超臨界炭酸ガス冷媒の減圧沸騰に関する実験的研究

抄録

The purpose of this research is to clarify the effect of divergent angle on the characteristics of decompression boiling generated in a two-phase flow nozzle using CO₂ refrigerant. Three types of convergent divergent nozzles with different divergent angle were manufactured. And the mass flow rate in these nozzles were measured by varying the inlet pressure and temperature. Experimental results confirmed that the experimental mass flow rate in the nozzle is almost equal to the critical flow rate of the IHE model. From the visualized image, it was confirmed that the boiling start point shifted to the upstream side from the nozzle throat depending on the inlet conditions.