叶片数及分流叶片对离心泵流场和空化性能的影响

发布时间：2018-07-07 09:42

本文选题：离心泵 + 叶片数　；参考：《中国农村水利水电》2016年04期

【摘要】：对一低比转数离心泵模型,在叶片数分别为3个长叶片,3长3短(3/3)分流叶片,6个长叶片的三组叶轮方案下,对离心泵内部三维定常湍流空化流场进行数值模拟,计算不同叶轮方案下的外特性曲线和空化特性预测曲线。结果表明:在空化充分发展的工况下,叶片数少的叶轮方案扬程对NPSH降低较敏感;随着叶片数的降低,叶轮进口低压区面积减小,叶片的载荷增大。采用分流叶片,不仅减轻了叶轮进口处因叶片太多带来的排挤严重现象,而且提高了泵的扬程,离心泵空化性能也得到改善。随着叶片数的增加,叶片表面载荷逐渐减小,对于带分流叶片的叶轮,长叶片载荷在径向位置大约为分流叶片进口直径处下降曲线变陡。模拟结果能较好地反映不同叶轮方案下叶片数对离心泵内空化发生的影响,为空化特性的研究奠定了一定的理论基础。
[Abstract]:For a low specific rotation centrifugal pump model, the three-dimensional steady turbulent cavitation flow field in the centrifugal pump is numerically simulated under three groups of impellers with three long blades, three long and three short (3 / 3) shunt blades and six long blades, respectively. The external characteristic curve and cavitation characteristic prediction curve of different impeller schemes are calculated. The results show that under the condition of full development of cavitation, the head of impeller with less blade number is more sensitive to the decrease of NPSH, and with the decrease of the number of blades, the area of low pressure area at the inlet of impeller decreases and the load of blade increases. The use of shunt blades not only alleviates the serious phenomenon of extrusion at the inlet of impeller due to too many blades but also improves the lift of the pump and the cavitation performance of the centrifugal pump. With the increase of the number of blades, the load on the blade surface gradually decreases. For the impeller with shunt blade, the radial position of the long blade load is steepened at the inlet diameter of the shunt blade. The simulation results can well reflect the influence of the number of blades on cavitation in centrifugal pump under different impeller schemes, which lays a theoretical foundation for the study of cavitation characteristics.
【作者单位】：西华大学能源与动力工程学院;
【基金】：国家自然科学基金项目(51279172) 西华大学研究生创新基金项目(YCJJ2015043) 流体及动力机械四川省科研创新研究团队(x1404)
【分类号】：TH311

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