中文摘要：

用ANSYSCFX软件对两相流Bl射制冷循环中的引射器内部流动进行了数值模拟，分析了混合室直径和喷嘴喉部直径对引射器性能的影响；根据数值模拟结果加工了gI射器试件，对R134a两相流引射器及引射循环制冷系统性能进行了实验研究，探讨了固定工况条件下引射器喷嘴喉部直径和混合室直径的优化匹配。实验与模拟结果均表明，在固定工况条件下，存在使引射比及COP分别达到最大的最佳混合室直径和喷嘴喉部直径组合。在冷凝温度为55℃、蒸发温度为3℃的工况下，当混合室直径为16mm、喷嘴喉部直径为2．0mm时引射器的引射比达到最大值，而两相流引射循环制冷系统的COP在混合室直径为16mm、喉部直径为1．7mm时最高，模拟与实验结果的变化趋势是一致的，但二者的引射比值误差较大。

英文摘要：

The two-phase flow field inside the ejector of the two-phase ejector refrigeration cycle （TPRC） system was simulated by ANSYS CFX, and the effects of the diameter of the mixing chamber and the throat diameter of the nozzle on the performance of the ejector were analyzed. According to the numerical simulation results, the ejector prototypes were manufactured. A series of experimental studies on the R134a two-phase ejector and the R134a two-phase ejector refrigeration cycle was carried out. The optimum matching between the throat diameter of the nozzle and the diameter of the mixing chamber was discussed under the fixed operating condition. The experimental and simulated results indicate that there is an optimal combination of the nozzle throat diameter and the mixing chamber diameter to maximize the entrainment ratio and the coefficient of performance （COP） of the TPRC system respectively under a fixed working condition. The entrainment ratio of the ejector reaches to the maximum value with the mixing chamber diameter of 16 mm and the throat diameter of 2.0 mm under the conditions of 55 Y~condensing temperature and 3 ＂C evaporating temperature, while the COP of the TPRC system is maximum while the throat diameter and the mixing chamber are 1.7 mm and 16 mm, respectively. The trend of the simulated and experimental results of the entrainment ratio and system COP is consistent, while the error between the simulated and experimental results is rather large.