射流泵空化流动的数值模拟  

Numerical simulation on cavitating flow within jet pump

作　　者：龙新平[1] 程茜[1,2] 韩宁[1] 蔡标华[1,3] 王丰景[1] 

机构地区：[1]武汉大学动力与机械学院,湖北武汉430072 [2]国家知识产权局,北京100190 [3]武汉第二船舶设计研究所,湖北武汉430064

出　　处：《排灌机械工程学报》2010年第1期7-11,17,共6页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(50579060)

摘　　要：基于非稳态雷诺平均N-S方程方法(Urans),对面积比为8.16的射流泵内不同空化阶段的非定常气液两相空化流动过程进行了数值模拟,包括射流泵内空化初生、空化发展及剧烈空化等不同过程的空化流动.捕捉到了气泡从射流边界层内初生,随着主流一起向下游流动、分裂、聚合、膨胀及消失的过程,模拟结果与试验观测一致.计算所得到的初生空化数也与试验值基本一致.模拟所得到的不同出口压力下的气相体积分数分布以及汽蚀流量比的变化表明:当射流泵工作压力与吸入压力固定时,射流泵出口压力越低,汽蚀流量比越小,同时流量比越接近汽蚀流量比,空化也越严重.Based on Unsteady Reynolds Averaged Navier- Stokes Equation （Urans） , the unsteady vaporliquid two-phase cavitating flow at different cavitation stages within a jet pump of area ratio of 8.16 was calculated. The cavitation process including inception cavitation, developing cavitation and intensive cavitations were all well simulated. Phenomena including the bubble incepting from the jet boundary layer and wobbling downstream with the main flow, bubble spliting, bubble converging, bubble inflating and bubble disappearing were captured. These simulation results are consistent with the experimental observa- tions. The incipient cavitation number is also basically consistent with the experimental data. The simula- ted distribution of the volume fraction of vapor phase under different outlet pressure and the variation of the eavitation flow ratio indicate that the intensity of cavitation is varied with the outlet pressure of the jet pump when driving pressure and suction pressure are fixed. As outlet pressure decreases, the cavitation flow rate ratio decreases and approaches the real flow rate ratio. Hence, the cavitation is more intensive.

关 键 词：射流泵 空化流动 CFD 气液两相流动 初生空化 剧烈空化 

分 类 号：TV131.32[水利工程—水力学及河流动力学] TH38[机械工程—机械制造及自动化]