基于进化算法和CFD技术的离心泵低稠度导叶的优化设计

Optimization Design of the Low Solidity Vane for the Centrifugal Pump Using Evolutionary Algorithms and CFD Technique

结合离心泵导叶型线参数化方法、进化优化算法和Navier-Stokes方程求解技术对传统导叶进行了低稠度导叶优化设计。优化设计得到了稠度分别是0.89和0.65的导叶型线,数值验证表明:两种低稠度导叶的静压回复系数均高于初始设计。结合离心叶轮和优化设计得到的两种低稠度导叶进行了整个离心泵水力性能数值验证,计算结果表明:稠度是0.89的导叶的离心泵水力性能优于初始设计,而稠度是0.65的导叶的离心泵水力性能低于初始设计。研究结果表明对于初始设计的离心泵,采用优化设计得到的稠度是0.89的导叶具有更加紧凑的设计并且可以满足初始设计的要求。

This paper presents numerical procedure in which a diffuser profile description code is combined with a blade-to-blade solution and Evolutionary Algorithms （EA） optimization method for redesigning the conventional vane into Low Solidity Vane Diffuser（LSD） for centrifugal pump. Vane blade with 0.89 and 0.65 in solidity have been designed without thinking of interaction of impeller and vane. The static pressure recovery coefficient of designed LSV is higher than the original one. Using 3- D numerical simulation method, the hydrodynamic performance is calculated for centrifugal pump with the designed and original vanes. The obtained results show that the centrifugal pump with vane of 0.89 in solidity has improved head and efficiency, especially in over capacity range. The centrifugal pump with the vane of 0.65 in solidity has lower head and efficiency than the original one in low discharge, whereas higher head and efficiency than the original one in over capacity. Designed vane of 0. 89 in solidity is the best tradeoff design for the original pump. The obtained results show that the present design tool is a simple and feasible algorithm for hydraulic turbomachinery design.