离心泵前置导叶的正交优化设计

Optimization Design of Inlet Guide Vane in a Centrifugal Pump Based on Orthogonal Method

为研究前置导叶各设计参数对离心泵水力性能的影响,对一IS系列离心泵运用二元理论自编程序完成其前置导叶的水力设计。应用L9（3^4）正交表,选取导叶轮毂半径r、长宽比R1b、安放角分布规律n及出口边速度环量Cur为设计参数,对其进行4因素3水平正交设计并得到9组导叶。对加装导叶的离心泵进行全流道数值计算,以扬程和水力效率为考察目标并利用极差方法分析影响其水力性能的主次因素,得到最佳方案。对最佳方案下导叶进行加工并试验,结果表明：数值模拟与试验结果基本吻合,综合优化后相比于未加装导叶的离心泵,加装导叶时离心泵扬程变化不大,水力效率提高1.43%,轴功率减少了0.83 kW,总能耗节能约2.06%,同时验证了正交优化方法的可行性及可靠性。

In order to study the influence of inlet guide vane（IGV） parameters on hydraulic performance of centrifugal pump,the hydraulic design of IGV was completed for one IS type centrifugal pump using in-house code based on two dimensional flow theory.The L9（3^4） orthogonal table was implemented to design nine type of IGVs,which contains four factors with three levels of hub radius r,length-width ratio R1b,setting angle distribution n and velocity circulation Curat outlet edge.The whole flow field of centrifugal pump with IGV was numerical simulated at three operating points,and regarding its head and hydraulic efficiency as the evaluation targets and aided by variance analysis,the primary and secondary factors of the researched parameters were acquired and obtained an optimal combination scheme.Then the hydraulic performance experiments for the optimal IGV were carried out and the results show that the numerical results agree well with the experimental.Comparing with that without IGV,the head of centrifugal pump with IGV changes not much while the hydraulic efficiency increases obviously by 1.43%and the shaft power decrease by 0.83%,saving the total of energy consumption about 2.06%,which meanwhile verifies the feasibility and reliability of the orthogonal optimization method.