对旋轴流式喷水推进泵空化流动数值模拟  

Numerical simulation of cavitation flow in counter-rotating axial-f low pump

作　　者：黄丹[1] 潘中永[1] 潘希伟[1] 冯子政 张肖[1] 

机构地区：[1]江苏大学国家水泵及系统工程技术研究中心,江苏镇江212013

出　　处：《排灌机械工程学报》2015年第4期311-315,共5页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51239005)

摘　　要：基于ANSYS CFX软件,利用Rayleigh-Plesset空化模型和SST湍流模型,在设计工况下,分别对首、次级叶轮单独以及对旋轴流式喷水推进泵整体进行了空化定常模拟,得到了各自的空化特性曲线.选择空化开始发生、临界空化点以及空化严重时3个工况比较分析首、次级叶轮内空化流动的发展情况.计算获得了不同净正吸头下叶片工作面、背面静压、背面空泡体积组分分布.计算结果表明,空化最初发生在首级叶轮叶片背面进口靠近轮缘的局部低压区,随着NPSH的减小,该空泡区域从轮缘向轮毂方向延伸.首、次级叶轮空化发展不同步,由于次级叶轮处于首级叶轮的预压下,首级叶轮发生空化时,次级叶轮并没有发生空化.计算结果从理论上较好地揭示了对旋轴流式推进泵空化性能的特点及其内部空化流动的特征.At the designed operating condition of the counter-rotating axial-flow pump,the cavitation flow field was simulated using cavitation model,Rayleigh-Plesset equations and the SST turbulence model,for 3 configurations： the pump with front impeller only,the pump with rear impeller only,and the pump with both impellers.The H-NPSH curves of the three cases were established based on the simulation.The cavitation flow of front impeller and rear impeller was analyzed by comparing the primary,critical,and serious cavitations.The distribution of static pressure and vapor volume fraction of the blade＇s suction surface and pressure surface as well as the vapor volume fraction of the suction surface was obtained.The results show that the cavitation first occurred in the local low-pressure area on the back of the blade＇s leading edge,then extended from the leading edge to the hub while decreasing NPSH.The cavitation development of the front impeller and rear impeller is not synchronous.The results reveal the cavitation flow in the counter-rotating axial-flow pump and its cavitation properties.

关 键 词：对旋轴流式喷水推进泵 CFX 空化 首、次级叶轮 数值模拟 

分 类 号：S212[农业科学—农业机械化工程] TH312[农业科学—农业工程]