Several rivers and streams are available in Africa and Asian regions with great potentials not applicable for constructing large hydropower dams but feasible for small and mini hydro generation. This study strive for investigating the impact of splitter blade on pump as turbine performance considering different speed and flow rates. Two specific centrifugal pump models one with six blades without splitter and another with four blades and four splitters were used for the study. The inlet diameter and outlet diameters of both impellers were 104 mm/116 mm, and 160 mm respectively at a designed flow rate Q = 12.5 m³/h, head H = 16 m, rotational speed n = 1450 rpm and efficiency of 56%, outlet impeller width of 0.006 m, a blade outlet angle of 30° was used for the study. CFD simulations were conducted with the use of k-ε turbulence model. The influence of splitter blade position on the performance of pump as turbine in the selected specific pumps with and without splitter blades has been investigated both experimentally and numerically at three different flow rates and rotational speed. The simulated data were in good agreement with the experimental results, the maximum deviation error between the CFD and test for each model are 5.6%, 2.6%, for the head and efficiency; 7.5% and 3.6% at different flow conditions.

非洲和亚洲地区有一些河流和溪流，潜力巨大，不适合建造大型水电大坝，但可以用于小型和微型水力发电。本研究致力于研究考虑不同速度和流量时分流叶片对泵和涡轮机性能的影响。该研究使用了两种特定的离心泵模型，一种具有六个叶片，不带分流器，另一种具有四个叶片和四个分流器。设计流量Q = 12.5 m ³ /h、扬程H = 16 m、转速n = 1450 rpm、效率为56%时，两个叶轮的入口直径和出口直径分别为104 mm/116 mm和160 mm。 ，出口叶轮宽度为 0.006 m，叶片出口角为 30° 用于研究。使用 k-ε 湍流模型进行 CFD 模拟。在选定的带有和不带有分流叶片的特定泵中，分流叶片位置对泵作为涡轮机的性能的影响已经在三种不同的流量和转速下进行了实验和数值研究。模拟数据与试验结果吻合较好，各模型CFD与试验的最大偏差误差分别为5.6%、2.6%，扬程和效率；不同流量条件下分别为 7.5% 和 3.6%。