M310压水堆核电厂离心式上充泵首级叶轮汽蚀特性

Cavitation Characteristics for Impeller of Centrifugal Charging Pump of M310 Nuclear Power Plants

采用Pro/E和ICEM软件进行水体部件的三维造型和网格划分,确定以Reynolds时均的N-S方程、RNG k-ε两方程湍流模型、SIMPLEC算法和汽蚀模型为基础的数值计算方法,完成对上充泵首级叶轮汽蚀特性的非稳态数值模拟及试验对比研究。计算结果表明:在汽蚀初生时,气体体积分数对叶轮流道内部的压力影响较小;在临界汽蚀余量,靠近叶片进口处的汽蚀变化对压力的影响较大;临界汽蚀余量的模拟和试验结果分别为7.35 m和7.58 m,误差约为2%,均满足核电规范要求。

In order to study the first stage impeller cavitation characteristics of the centrifugal charging pump, Pro/E and ICEM soRware were respectively used as the tools for three-dimensional modeling and meshing of the hydraulic machinery, and a numerical calculation method was determined based on Reynolds time-averaged N-S equations, RNG k-e two-equation turbulence model, SIMPLEC algorithm and cavitation model, and last unsteady numerical simulation and experimental comparative study of the first stage impeller cavitation characteristics of the centrifugal charging pump were finished. The results showed that： when initial cavitation happened, gas volume fraction less affected the impeller internal pressure; when critical NPSH reached, inlet cavitation changes near the blade has great effect on the pressure; simulation and experimental results of critical N-PSH were respectively 7.35 m and 7.58 m, and error was about 2%, and they all satisfied the nuclear power specifications of〈 7.8 m.