叶轮切割对回收液力透平性能的影响

发布时间：2018-07-16 08:42

【摘要】：为研究叶轮切割对回收液力透平性能的影响,选取比转速分别为46.0、55.7、63.2的离心泵反转作回收液力透平,对各个叶轮外径进行四次切割,应用CFD软件对这三种比转速液力透平在不同切割量下进行数值计算,得到液力透平运行的外特性曲线并分析其内部流动规律。结果表明,对于离心泵反转作回收液力透平,透平的压头随叶轮外径切割量的增大而减小。在小流量工况下随着叶轮外径切割量的增加,叶轮内部流动损失逐渐减小,透平的水力效率呈现上升趋势;在最优工况和大流量工况下随着叶轮外径切割量的增加,叶轮内部流动更加紊乱,产生较大的能量损失,透平的水力效率呈现下降趋势。
[Abstract]:In order to study the effect of impeller cutting on the performance of recovered hydraulic turbine, the centrifugal pump with specific rotational speed of 46.0 ~ 55.7 / 63.2 was selected as the recovery hydraulic turbine respectively, and the outer diameter of each impeller was cut four times. By using CFD software, the external characteristic curve of hydraulic turbine is obtained and its internal flow law is analyzed. The results show that the pressure head of the turbine decreases with the increase of the cutting volume of the impeller. Under the condition of small flow rate, with the increase of the cutting rate of impeller outer diameter, the internal flow loss of impeller decreases gradually, and the hydraulic efficiency of turbine increases, while under the optimal working condition and the high flow condition, with the increase of impeller outer diameter, the flow loss of impeller decreases gradually, and the hydraulic efficiency of turbine increases with the increase of outside diameter of impeller. The internal flow of impeller is more disordered, resulting in larger energy loss, and the hydraulic efficiency of turbine decreases.
【作者单位】：兰州理工大学能动学院;甘肃省流体机械及系统重点实验室;
【基金】：国家自然科学基金资助项目(51569013)
【分类号】：TH311

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