离心泵多工况水力设计方法

Multi-points hydraulic design method of centrifugal pumps

针对现有的离心泵水力设计方法仅满足单点设计工况性能,无法满足其他工况性能的问题,提出一种离心泵多工况水力设计方法.以单点设计的关键几何参数值为初始条件、多工况的扬程为约束条件、多个工况的加权平均效率最高为目标,同时采用自适应模拟退火算法对离心泵多工况能量性能计算模型进行求解.最后根据比转数为129.3的离心泵3个工况点的能量性能要求,在考虑权重的基础上提出了2种多工况水力设计方案.数值计算结果表明:2种多工况设计能基本满足3个工况点的能量性能要求,误差均在5%以内.

The current hydraulic design of centrifugal pumps only can meet the performances of single point requirements. Thus, a hydraulic design method of centrifugal pumps was proposed to meet multiple design needs. The design method used single-point design requirements as the initial conditions, heads at different conditions as the constraints conditions, and the maximum of weighted average effi- ciency at different conditions as the objective function. The adaptive simulated annealing algorithm was used to solve the energy performance calculation model. Considering weight factors of 3 design points for a centrifugal pump, whose special speed is 129. 3, two multi-points hydraulic design schemes were proposed. CFD numerical simulation results show that the single-point hydraulic design cannot meet energy performances at large flow rate and two multi-points can satisy all design demands. As the two multi-points hydraulic designs, the energy performance errors between numerical simulation values and design demand values are within 5%.