叶轮型式对超低比转速高速离心泵性能的影响

Impact of impeller type on performance of high-speed centrifugal pumps with ultra-low specific-speed

为了分析不同叶轮型式对超低比转速高速离心泵性能的影响,对采用普通叶轮与复合叶轮离心泵内部流动进行数值模拟.计算基于连续方程和雷诺时均N-S方程,采用标准的k-ε湍流模型和SIMPLEC算法.模拟采用不同长短叶片的复合叶轮的超低比转速高速离心泵在设计工况下的全三维流场,得到短叶片径向和周向偏置位置的最佳组合.着重分析比较采用普通叶轮和复合叶轮两种离心泵模型方案在不同流量下叶轮内部的速度场和压力场,得到其内部流动的主要特征.研究结果表明,在其他过流部件相同的条件下,采用长短叶片的复合式叶轮离心泵其性能比普通常规叶轮更佳.

To analyze the performance of high-speed centrifugal pumps with ultra-low specific-speed, numerical simulation of inner flow in centrifugal pump with ordinary impeller and complex impeller was conducted. The calculation was based on the continuity equation and Reynolds-averaged Navier-Stokes equation. The control equation was solved by using standard k-ε turbulence mode and SIMPLEC algorithm. The three-dimensional turbulent flow fields in high-speed centrifugal pumps with ultra-low specific-speed were analyzed in design condition by means of numerical simulation. When different types of complex im- pellers were used. The best combination of the radial and circumferential offset position of the short blade was given. The distribution of velocity and pressure in ordinary impeller and complex impeller in different operations were emphatically analyzed and compared. So that the main features of internal flow in two types of impellers were given. It was found that the performance of complex impeller with short and long blades was better than that of ordinary conventional impeller when other flow-passage components were identical.