隐性汽蚀过渡过程主泵叶轮内瞬变流动特性研究  

Transient Flow Characteristics of Nuclear Reactor Coolant Pump in Recessive Cavitation Transition Process

作　　者：王秀礼[1] 袁寿其[1] 朱荣生[1] 俞志君[2] 

机构地区：[1]江苏大学流体机械工程技术研究中心,江苏镇江212013 [2]江苏振华泵业制造有限公司,江苏泰州225500

出　　处：《核动力工程》2013年第3期71-76,共6页Nuclear Power Engineering

基　　金：国家杰出青年科学基金(50825902);国家科技支撑计划(2011BAF14B04);江苏省科技支撑计划项目(BE2010156);江苏省自然科学基金科技项目(BK2011504)

摘　　要：通过CFX程序对反应堆主泵叶轮流道内发生隐性汽蚀时瞬态流动特性进行数值模拟计算,研究分析从汽蚀初生工况起降低进口压力至临界汽蚀余量过渡过程中主泵内部瞬态流动特性。流场分析表明:在隐性汽蚀过渡过程中,汽泡相的增加会影响进口处速度变化,使得靠近主泵叶片进口处的速度随汽泡相区域的增大而变大,且汽泡的产生和溃灭会影响靠近进口处速度波动幅度;靠近叶片进口处涡量值受汽泡相影响而逐渐增大,汽泡的溃灭会降低溃灭处至叶轮出口处间的涡量值;由于泵体的非对称结构,导致叶轮各流道内的流量、流速及叶轮出口压力分布出现非对称性,引起瞬态径向力的不对称性。汽蚀发展到一定程度后,汽泡相开始对叶轮瞬态径向力值产生影响使其出现无规律波动。The numerical simulation calculation of the transient flow characteristics of nuclear reactor coolant pump in the recessive cavitation transition process in the nuclear reactor coolant pump impeller passage is conducted by CFX, and the transient flow characteristics of nuclear reactor coolant pump in the transition process from reducing the inlet pressure at cavitation-born conditions to NPSHc condition is studied and analyzed. The flow field analysis shows that, in the recessive cavitation transition process, the speed diversification at the inlet is relative to the bubble increasing, and makes the speed near the blade entrance increase when the bubble phase region becomes larger. The bubble generation and collapse will affect the the speed fluctuation near the entrance. The vorticity close to the blade entrance gradually increasing is influenced by the bubble phase, and the collapse of bubble generated by cavitation will reduce the vorticity from the collapse to impeller outlet. Pump asymmetric structure causes the asymmetry of the flow, velocity and outlet pressure distribution within every impeller flow passage, which cause the asymmetry of the transient radial force. From the dimensionless t/T =0.6, the bubble phase starts to have impact on the impeller transient radial force, and results in the irregular fluctuations.

关 键 词：主泵 隐性汽蚀 过渡过程 数值模拟 流动特性 

分 类 号：TH212[机械工程—机械制造及自动化] TH213.3