几何参数对两相流引射器及系统性能影响的研究.pdf

几何参数对两相流引射器及系统性能影响的研究

裴文伟郭宪民王善云

(天津商业大学天津市制冷技术重点实验室天津 300134)

摘要用两相流引射器代替膨胀阀,可回收R134a两相流引射制冷循环中高压工质的压力能,提高
系统循环效率。本文用CFD软件对引射器内部流动进行了数值模拟,分析了喷嘴喉部直径和混合室直
径对引射器性能的影响;根据数值模拟结果加工了引射器试件,在R134a两相流引射器节流制冷循环
实验台进行了实验研究。实验结果与模拟结果均表明,蒸发温度为3℃,冷凝温度为55℃的工况下,
、混合室直径为16mm时引射器的引射比最高。在其他尺寸不变的条件下,存
在使引射比达到最大的最佳喷嘴喉部直径和最佳混合室直径。
关键词两相流引射器几何参数模拟实验

AN INVESTIGATION ON THE EFFECT OF GEOMETRIC PARAMETER
ON THE PERFORMANCE OF TWO-PHASE EJECTOR AND
REFRIGERATION SYSTEM

Pei Wenwei Guo Xianmin Wang Shanyun
(Tianjin Key Laboratory of Refrigeration Technology, Tianjin University merce,Tianjin,300134,china)

Abstract The expansion valve is replaced by a two-phase ejector to recover the potential energy of the
high pressure refrigerant and to increase the coefficient of performance in the two-phase ejector
refrigeration cycle. The numerical simulation of the two-phase flow fluid inside the ejector was carried out
by CFX software. The effects of the throat diameter of the nozzle and the diameter of the mixing chamber
on the performance of the ejector were analyzed. According to the numerical simulation results, the ejector
prototypes were manufactured. The performance of the ejector prototypes were measured on the two-phase
ejector refrigeration cycle test-setup. The experimental and numerical simulation results show that the
entrainment ra