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针对叶轮进口宽度对液力透平性能影响规律的认识不足问题,建设了一开式液力透平实验台,对一单级液力透平进行了实验研究,得到了该比转速液力透平的外特性曲线。采用结构化网格技术对液力透平进行了全流场数值计算与分析,数值与实验相结合,验证了数值计算的准确性。对不同进口宽度透平叶轮的数值计算结果分析表明,随着透平叶轮进口宽度的增加最高效率点向大流量偏移,大流量时的效率逐渐增加;对于一定几何参数组合的液力透平,存在最佳叶轮进口宽度使液力透平最优工况点效率最高;透平的流量扬程曲线随叶轮进口宽度的增加变得更加平坦;透平的轴功率变化相对较小。
In view of the lack of understanding of the influence of inlet width of impeller on the performance of hydraulic turbine, an open-ended hydraulic turbine test bench was constructed and a single-stage hydraulic turbine was experimentally studied. Flat outer characteristic curve. The full-flow numerical calculation and analysis of the hydraulic turbine were carried out by using structured grid technology. The numerical and experimental results verified the accuracy of the numerical calculation. Numerical analysis of turbine impellers with different inlet widths shows that the highest efficiency point shifts to large flow rate with the increase of inlet width of turbine impeller, while the efficiency increases with large flow rate. For a certain geometric parameter combination of hydraulic turbine , And the best impeller inlet width exists, which results in the highest efficiency of hydraulic turbine. The turbine head flow curve becomes more flat with the increase of impeller inlet width. The turbine shaft power change is relatively small.