排灌机械工程学报2016，Vol.34Issue(3)：185-190,6.DOI:10.3969/j.issn.1674-8530.15.0114
余热排出泵叶轮内空化流动特性的数值分析
Numerical analysis of cavitating flow characteristics in impeller of residual heat removal pump
摘要
Abstract
In order to investigate internal cavitating flow characteristics of the impeller in residual heat removal pumps,the three-dimensional cavitating flow in a residual heat removal model pump is numeri-cally calculated by using the homogeneous mixture cavitation model based on the Rayleigh -Plesset equation and the shear stress transport SST k -ωturbulence model.The hydraulic performance curves, distributions of vapor volume fraction at NPSHA and the blade load profiles at the design flow rate are obtained.The numerical results show that the distribution of vapor volume fraction becomes non-axi-symmetric with the decreasing of NPSHA,even some blade passages are blocked when NPSHA drops to 2.63 m.Vapor volume fraction distribution varies across blade span;the shorter the distance to the hub is,the higher the vapor fraction on the blade suction side is.Additionally,the cavity in the impel-ler shows a quasi-steady characteristic before the head starts to be deteriorated rapidly.Due to a sud-den change in the primary flow direction near the eye of impeller,the blade load on the blade pressure side shows a sudden increasing and drop effect.关键词
余热排出泵/空化/叶轮/叶片载荷/数值分析Key words
residual heat removal pump/cavitation/impeller/blade load/numerical analysis分类
农业科技引用本文复制引用
洪锋,袁建平,周帮伦..余热排出泵叶轮内空化流动特性的数值分析[J].排灌机械工程学报,2016,34(3):185-190,6.基金项目
国家自然科学基金重点资助项目（51239005）；江苏省普通高校研究生科研创新计划项目（KYLX＿1040）；江苏高校优势学科建设工程项目 （）
