虹吸式出水流道轴流泵装置全流道空化特性  

Siphon outlet conduit on full passage cavitation characteristics of axial-flow pumping unit

作　　者：周大庆[1] 刘敏[1] 陈会向[2] 

机构地区：[1]河海大学能源与电气学院,南京210098 [2]河海大学水利水电学院,南京210098

出　　处：《华中科技大学学报（自然科学版）》2017年第1期128-132,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51339005)

摘　　要：为研究含虹吸式出水流道轴流泵装置的空化特性,基于ANSYS 16.0软件平台,对装置模型进行结构化网格划分,通过采用SSTk-ω湍流模型和Zwart空化模型封闭多相流控制方程,对含虹吸式出水流道的轴流泵装置进行全流道空化特性数值模拟,并将预测结果与试验进行对比.结果表明:在设计流量工况下,结构化网格的划分方案能够较好地满足湍流模型的网格要求;随着有效汽蚀余量的减小,数值计算与试验所得装置扬程曲线均呈先上升后下降的变化趋势,误差介于1.93%~2.91%之间;全流道空化特性中扬程上升现象与只有泵段空化时的扬程上升现象机理不同.To study the cavitation characteristics of the model axial-flow pump installation with siphon outlet conduit,the whole passage geometric model adopted the structured mesh generation and the governing equations using Zwart cavitation model were closed with SSTk-ωturbulence model basing on ANSYS 16.0.The numerical results under the design condition were in good agreement with the experimental results.The results show that the scheme of structured mesh generation could meet the requirement of turbulence model under the design condition.The pump lift of the model pump installation achieved by both numerical simulation and test result increases firstly and in turn decreases with NPSH reduction,and the error range is 1.93%~2.91%.The bubbles collapse would cause flow pattern reconstruction and the average swirl angle variation at the guide vane outlet.

关 键 词：轴流泵装置模型 虹吸式出水流道 空化特性 扬程上升 平均涡角 

分 类 号：TH312[机械工程—机械制造及自动化]