多工况高效无过载低比转数离心泵设计优化

为满足低比转数离心泵对多工况点效率和无过载特性要求,针对模型泵TS65-40-160,基于无过载理论进行设计优化,通过CFD分析内部流动分布规律,并采用快速成型模型试验进行对比分析。经过多方案改进得到较优方案2,该方案扬程在关死点、设计点以及最大流量点均高于设计要求;最高机组效率提高了14%,功率特性曲线出现了无过载趋势,在最大要求流量点48 m3/h处输入功率却未增大,且泵效率达到国家标准要求。经多方案CFD模拟和试验数据对比,证明模拟精度可满足模型优选要求。

Optimization Design of High-efficiency Non-overload on a Low-specific Speed Centrifugal Pump

With the aim to meet the demand of a low-specific speed centrifugal pump for the high efficiency and non-overload characteristics at several specific operation points, a series of optimization were done on a model pump TS65-40-160. An impeller was designed based on the non-overload theory, and by analyzing the inner flow distribution in CFD and verify experiments, several improvements were taken to meet the complicated requirements. After several design improvements and experiments, an optimized scheme was obtained, whose head are slightly higher than the given indexes in the shut-off, designed and maximum flow rate points, and the maximum unit efficiency is increased by nearly 14%, and the pump efficiency also meet the national standard requirement, and the shaft power has the non-overload trend, and the power value at 48m3/h is within the motor power. Through many results comparisons from CFD and experiment, a conclusion is drawn that the simulation error is small and it can meet the requirement for model optimization.