多级离心泵级间导叶性能优化

Performance Optimization for Intermedia Stage Guide Vanes of Multistage Centrifugal Pump

为研究多级离心泵导叶内的流动损失,基于DES数值模拟方法,对某型多级离心泵进行瞬态模拟,并利用试验验证了数值方法的可靠性。在此基础上,通过分析样机流场模拟结果提出导叶内损失的3种机理:漩涡、环流和碰撞。为减少导叶内损失,运用叶轮设计方法重新设计了反导叶,并对过渡段进行光滑改进。模拟结果显示改进反导叶和过渡段均能改善泵内的流场,泵效率分别提高2.4%和1.7%;耦合优化后导叶内的速度矢量和流线均未显示漩涡,环流和碰撞大大降低,泵效率提高2.9%。

In order to investigate the flow loss in guide vanes, detached eddy simulation （DES） was used to simulate the transient flow field of a multistage centrifugal pump. The obtained numerical resuhs were compared with experimental results, and the outcome showed that mean errors of head and efficiency were less than 4%. Simulation results analyzation showed that there were three main causes of the loss, which were flow separation in return guide vane passage, circumflux in transferable channel and collision in PS side. In order to decrease the loss, return guide vanes were designed through impeller blade design methods and transferable channels were optimized. The results showed that flow separation and collision redueed when applied impeller blade design method and circumflux reduced through TZ type transferable channel, whieh improved pump＇ s efficiency by 2.4% and 1.7% , respectively. The analysis nf flow fiehls in the coupled vanes showed that eireumflux, collision and separation flow were both reduced significantly, which improved pump＇ s efficiency by 2.9%