冰箱喷射器最优喷射系数分析.pdfVIP

第 40 卷第 2 期 中南大学学报( 自然科学版) Vol.40 No.2 2009 年 4 月 Journal of Central South University (Science and Technology) Apr. 2009 冰箱喷射器最优喷射系数分析 刘益才，曹立宏，马卫武，黄 谦，辛天龙，张明研，宛 超 ( 中南大学 能源科学与工程学院，湖南 长沙，410083) 摘 要：利用计算流体力学 FLUENT 软件，建立冰箱喷射器内部流体流动模型，根据新型压缩/喷射混合制冷循 环系统冰箱实验样机的实际运行情况和操作参数，对制冷剂在冰箱喷射器内喷射、引射、混合、扩散等现象进行 数值仿真研究；对冰箱喷射器混合室流场结构及引射机理进行探讨；同时，研究喉管面积比对冰箱喷射器性能的 影响。研究结果表明：冰箱喷射器的操作参数和几何参数对其波系结构影响很大，在其他参数一定的情况下，存 在一个最佳的喉管面积比 ψopt=7.513 ，对应于最高的喷射系数 u=0.561 。 关键词：冰箱；喷射器；喉管面积比；喷射系数 中图分类号：TB651 文献标识码：A 文章编号：1672−7207(2009)02−0329−05 Optimum eject-coefficient of refrigerator-ejector LIU Yi-cai, CAO Li-hong, MA Wei-wu, HUANG Qian, XIN Tian-long, ZHANG Ming-yan, WAN Chao (School of Energy Science and Engineering, Central South University, Changsha 410083, China) Abstract: A commercial CFD scheme FLUENT was used to simulate the fluid flow process in refrigerator-ejector. According to the practical operating conditions and parameters of the new-typed compression/injection hybrid refrigeration cycle system, the refrigerant properties such as injecting, aspirating, mixing, diffusing in the refrigerator-ejector were studied. The flow field structure of refrigerator-ejector mixing chamber and mechanism of aspiration were explored. At the same time, the performance of refrigerator-ejector was investigated by changing the throat area ratio. The numerical results clearly indicate that the operating and geometric parameters have great influence on structure of wave system of refrigerator-ejector. When other parameters have no change, there is an optimum throat