喷水推进泵叶顶间隙泄漏流动特性研究  

Research on leakage flow characteristics in blade tip of water jet pump

作　　者：张睿[1] 丁旭洁 牟童[1] 江扬阳 潘玉梦 Rui Zhang;Xu-jie Ding;Tong Mou;Yang-yang Jiang;Yu-meng Pan(College of Agricultural Science and Engineering,Hohai University,Nanjing 211100,China)

机构地区：[1]河海大学农业科学与工程学院,南京211100

出　　处：《水动力学研究与进展（A辑）》2022年第5期743-750,共8页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金资助项目(51809081);江苏省自然科学基金资助项目(BK20201315);中国博士后科学基金资助项目(2019M661707);江苏省博士后科研资助计划项目(2019K095)。

摘　　要：目前喷水推进技术日趋成熟,应用广泛,而喷水推进泵叶顶间隙流场复杂,亟待忖度。该文以ONR AxWJ-2喷水推进泵为研究对象,基于FBM-CC模型对不同流量工况进行非定常计算,通过对其外特性、内部流场及涡量场的分析,研究喷水推进泵叶顶间隙泄漏流动特性。结果表明:FBM-CC模型可以有效预测喷水推进泵的水力性能;随着流量增大,叶片正背面压差增大,促进了主泄漏涡的发展,同时吸力面的卷吸作用增强;主泄漏涡受到主流的阻力作用,湍动能大量耗散,而二次泄漏涡是由吸力面低压引起的主动回旋,旋转率不强,也不直接与主流相互作用;根据涡量输运方程,涡拉伸项(VST)对泄漏涡的涡量变化率影响较大,科氏力项(CORF)影响泄漏涡的初始位置,黏性扩散项(VIST)对叶顶处泄漏涡的发展产生影响。At present, water jet propulsion technology is becoming more and more mature and widely used, while the leakage flow field of water jet pump blade tip is complex, which needs to be determined urgently. This paper takes ONR AxWJ-2water jet pump as the research object. Based on the FBM-CC model, the unsteady calculation of different flow conditions is carried out. Through the analysis of its external characteristics, internal flow field and vorticity field, characteristics of leakage flow field in the blade tip is studied. The results show that the FBM-CC model can effectively predict the hydraulic performance of the water jet pump;with the increase of the flow rate, the pressure difference between the blade pressure surface and the suction surface increases, which promotes the development of the main leakage vortex, and meanwhile the entrainment effect of the suction surface is enhanced. The tip leakage vortex(TLV) is affected by the resistance of the mainstream, and the turbulent kinetic energy is dissipated in large quantities, while the secondary tip leakage vortex(S-TLV) is an active swirl caused by the low pressure on the suction surface, and the rotation rate is not strong and does not directly interact with the mainstream;according to the vorticity transport equation, the vortex stretching term(VST) has a great influence on the vorticity change rate of the tip leakage vortex, the Coriolis force term(CORF) affects the initial position of the tip leakage vortex, and the viscous diffusion term(VST) affects the development of the tip leakage vortex at the tip of the blade.

关 键 词：喷水推进泵 叶顶间隙 泄漏流 主泄漏涡 二次泄漏涡 涡量输运方程 

分 类 号：TH31[机械工程—机械制造及自动化]