中文摘要：

在两相流引射制冷循环中，采用引射器来代替膨胀阀，回收节流过程中的膨胀功。采用可调式喷嘴引射器，通过调节喷针的位置调节引射器喷嘴出口的流通截面积来改变工作流体的流量。对以R134a为工质的两相流引射制冷循环系统进行实验研究并对引射器内部的流动进行数值模拟，分析喷嘴喉部截面积和扩张角对R134a两相流引射制冷系统性能的影响。模拟结果和实验结果均表明：在定工况条件下，引射器的引射比随喷嘴喉部截面积的增大而升高，而随喷嘴扩张角的增大先升高后减小，在喷嘴扩张角为3。时取得最大值。系统的COP随喷嘴喉部截面积的增大先升高后减小，在喷嘴喉部截面积为2．84mm2时，系统COP取得最大值。

英文摘要：

The expansion valve was replaced by a two - phase ejector to recover the expansion work in the two - phase ejec- tor refrigeration cycle （TPERC） system. The performance of the TPECR system and the ejector were carried out experimentally, and the internal flow characteristics of the ejector was simulated using CFX software in this paper. In the TPERC system the working fluid was RI34a and the adjustable ejector was used, in which the cross - section area of the nozzle could be adjusted by a needle. The effects of the throat area and divergence angle of the nozzle on the performance of the R134a TPERC system were analyzed. The simulation and the experimental results indicate that under a fixed working condition the entrainment ratio of the ejector increases with the increase in the throat area of the nozzle, and firstly increases then decreases with the increase in the divergence angle of the nozzle. The optimum divergence angle of the nozzle that makes the entrainment ratio be maximum is 3°. The COP of the TPERC system with Laval nozzle firstly increases then decreases with the increase in the cross - sectional area of the nozzle throat, which achieve maximum as the cross - section area of the nozzle throat is 2.84 mm2.