长短叶片半开式离心叶轮内部流动的数值模拟

为了分析分流叶片对于半开式离心叶轮内部流动的影响，对轴向间隙为1.1 mm的4长叶片和4长4短叶片的两种半开式低比转速高速离心叶轮进行了研究.采用S A湍流模型和雷诺时均N-S方程，对叶轮内部的流动进行了三维紊流数值计算和分析；并对离心泵进行了试验研究.数值计算结果表明，分流短叶片可以改善叶轮内部的流动；两个叶轮内部的静压力都由叶片进口到出口逐渐升高，等静压曲线几乎是沿圆周方向的；具有分流叶片的叶轮出口的压力系数较高.实验结果表明，具有分流叶片的叶轮离心泵的扬程和效率较高，说明分流叶片可以提高离心泵的性能.

Numerical simulation of flow in semi-open centrifugal impeller with long-short blade

Two low-specific-speed high-speed impellers with four-long blades and four-long four-short blades were investigated when the axial clearance was 1.1 mm to analyze the effect of splitter on the flow of semi-open centrifugal impeller. Using the Spalart-Allmaras turbulence model and the Reynolds-Averaged Navier-Storkes equations, the three dimensional turbulent flow fields in the impellers were analyzed numerically. Experimental studies on the centrifugal pump were carried out. Simulation shows that the splitter can improve the flow in impeller, the static pressure in two impellers rises gradually from blade inlet to outlet, the pressure counters are almost along the circumferential direction, arid the static pressure coefficient at impeller outlet with splitter is larger. The experimental results show that the efficiency and head of the centrifugal pump with splitter impeller is higher and that the splitter can improve the performance of centrifugal pump.