基于CFturbo-PumpLinx的离心泵流场模拟与结构优化

CFturbo-Pump Linx-based Flow Field Simulation and Structure Optimization for Centrifugal Pump

为获得离心泵最优结构,根据给定的离心泵工况,计算离心泵结构参数,依照参数应用CFturbo软件建立离心泵各部件三维实体模型,采用Pump Linx软件对离心泵流场进行了数值模拟,得到了叶轮运动的压力云图、速度云图以及蒸汽体积分数图。综合考虑离心泵的效率和汽蚀,选取叶轮的进口角β1、出口角β2、进口直径Ds、包角φ作为正交试验的4个因素,完成了正交实验并对实验结果进行了极差分析,得到了各结构参数对各优化方向评价指标影响的排序及其影响情况;构造出了效率最大、汽蚀余量最小条件下的目标函数,统一目标函数,并运用遗传算法对离心泵效率和汽蚀进行多目标优化,得到了离心泵叶轮最佳参数组合。

In order to obtain an optimized structure of a centrifugal pump,structural parameters of a centrifugal pump were calculated according to give working conditions of the centrifugal pump. With the parameters,CFturbo software was used to construct 3-D entity models for components of the centrifugal pump and Pump Linx software was used for numerical simulation of the flow field of the centrifugal pump. The pressure nephogram,the speed nephogram and steam volume fraction diagram of impeller movement were obtained. Based on comprehensive consideration of efficiency and cavitation of the centrifugal pump,the inlet angle β1,the outlet angle β2,the inlet diameter Dsand the wrap angle of the impeller φ were adopted as the four factors for an orthogonal test. The orthogonal test was completed and range analysis was conducted on the test result to achieve the order of impacts of different structural parameters on evaluation indexes of different optimized directions and the influencing conditions,an objective function with a maximal efficiency and a minimal net positive suction head（NPSH） and a unified objective function were constructed. In addition,genetic algorithm（GA） was used to conduct multi-objective optimization of the efficiency and the cavitation of the centrifugal pump,therefore,to achieve an optimal parameter combination for the compeller of the centrifugal pump.