中文摘要：

基于海军司烧方程和 Spalart-Allmaras 骚乱模型，在有 long-mid-short 片建筑群 impeller 的离心的泵的三块维的狂暴的流动地数字地计算、分析。在 flowpart 的相对速度和压力分布被获得。在复杂 impeller 的经过的流动由于在涡囊和 impeller 之间的联合行动是不对称的，这被发现。逆流区域在长片的吸方面的入口，在长片的压力方面和短片的吸方面的插头的中间的部分附近。涡囊喉咙附近的流动被涡囊极大地影响。相对速度大，在涡囊喉咙附近在复杂 impeller 的插头带回来流动是容易的。静电干扰和全部的压力在 impeller 从入口一致地升起到插头。在 impeller 插头，压力周期性地严厉地从压力方面减少到吸方面，然后静态的压力喉咙附近的上升。试验性的结果证明在 impeller 的背流动在泵的表演上有重要影响。

英文摘要：

Based on the Navier-Stokes equations and the Spalart-Allmaras turbulence model,three dimensional turbulent flow fields in centrifugal pump with long-mid-short blade complex impeller are calculated and analyzed numerically.The relative velocity and pressure distributions in the flowpart are obtained.It is found that the flow in the passage of the complex impeller is unsymmetrical due to the joint action between volute and impeller.The back-flow region is at inlet of long-blade suction side,near middle part of long-blade pressure side and outlet of short-blade suction side.The flow near volute throat is affected greatly by volute.The relative velocity is large and it is easy to bring back flow at outlet of the complex impeller near volute throat.The static and total pressure rise uniformly from inlet to outlet in the impeller.At impeller outlet,the pressure periodically decreases from pressure side to suction side,and then the static pressure sharply rise near the throat.The experimental results show that the back flow in the impeller has an important influence on the performance of pump.