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中文摘要：
为研究核主泵停机过渡过程中瞬态水的动力特性,通过Pro/E软件对核主泵内部流道进行三维造型,利用雷诺时均N-S方程和RNGk-ε方程,应用计算流体力学软件CFX对核主泵叶轮流道内的停机过渡过程瞬态涡变和径向力进行数值模拟计算。结果表明：叶轮出口涡量小于进口涡量,且叶轮出口涡量受叶轮与导叶动静干涉影响而呈大幅的周期性波动。在泵体与出口管交接处的涡量变化较大,与导叶出口方向相反方向处的涡量变化最大。对比3种停机惰转过渡过程中惰转模型可知,带惰轮惰转模型的径向力呈周期性波动逐渐减小;线性惰转模型与带惰轮惰转模型的径向力变化趋势类似,但其变化幅度少于线性惰转模型径向力变化幅度,t/T=0.6～1时,其径向力变化幅度接近零;常规惰转模型的径向力呈现不规律变化,t/T约为0.25时出现极大值,对核主泵的可靠运行产生较大影响。
英文摘要：
For the study of the transient hydrodynamics of nuclear reactor coolant pump during stopping period,Pro/E software for 3-D modeling,CFX software based on Reynolds N-S equation and RNG k-ε equation were used to simulate the transient characteristics of nuclear reactor coolant pump impeller flow path during stopping period.The vortex in the impeller outlet is less than that in the impeller inlet.The vortex of the impeller outlet influenced by the static interference between the impeller and guide vane shows the periodic substantial fluctuations.The vortex in the junction between the pump body and outlet pipe is large,and the vortex in the opposite direction of the guide vane is the largest.The radial force of linear turning down model shows a periodic fluctuation and gradual decrease.Turning down model with the idler wheel has the same tendency as the linear turning down model though the change amplitude is less than that of radial force for linear turning down model.Especially while the parameter t/T is 0.6-1,the radial force is close to 0.The radial force of regular turning down model shows an irregular change.When the parameter t/T is 0.25,its radial force is the largest,which has great influence on the reliability of nuclear reactor coolant pump.
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