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Circumferential groove on flow field and pressure fluctuation intensity of a semi-open centrifugal pump under design condition
参考中译:环向槽对半开式离心泵流场及压力脉动强度的影响


          

刊名：Proceedings of the Institution of Mechanical Engineers
作者：Like Wang（State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi'an University of Technology）
Xingqi Luo（State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi'an University of Technology）
Jinling Lu（Department of Power Engineering, Institute of Water Resources and Hydroelectric Engineering, Xi'an University of Technology）
Jianjun Feng（Department of Power Engineering, Institute of Water Resources and Hydroelectric Engineering, Xi'an University of Technology）
Guojun Zhu（State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi'an University of Technology）
Wei Wang（Department of Power Engineering, Institute of Water Resources and Hydroelectric Engineering, Xi'an University of Technology）
刊号：780C0002-C
ISSN：0954-4062
出版年：2023
年卷期：2023, vol.237, no.24
页码：5884-5896
总页数：13
分类号：TH11
关键词：Centrifugal pump；Circumferential groove；Pressure fluctuation；Tip leakage vortex；Flow field；Entropy production
参考中译：离心泵；周向槽；压力脉动；叶尖泄漏涡；流场；熵产生
语种：eng
文摘：The tip leakage flow (TLF) generated by the tip clearance has adverse effect on the performance of the impeller and increases pressure fluctuation. To suppress the effect of TLF on the instable flow in a semi-open centrifugal pump, the circumferential groove method is proposed in this paper. The effect of the circumferential groove on the internal flow and pressure fluctuation under the design condition is studied by combining numerical simulation with experiment. The results show that the head and efficiency were reduced by 1.1% and 1.0%, respectively. However, the circumferential groove provided a circumferential channel for leading edge overflow. The fluid in the groove formed a jet near the low-pressure region, which can effectively disperse the low-energy fluid of the blade inlet. The initial position and trajectory of the tip leakage vortex (TLV) move downstream, which decreases the relative flow angle and low-velocity region. The flow field in the blade tip region was improved remarkably. The low-frequency pressure fluctuation in the pressure surface and tip clearance of the blade inlet was suppressed by the circumferential groove, and pressure pulsation intensity decreased by 50% and 66%, respectively.
参考中译：叶顶间隙产生的叶尖泄漏流对叶轮的性能有不利影响，增加了叶轮的压力脉动。为了抑制TLF对半开式离心泵内不稳定流动的影响，本文提出了一种周向槽法。采用数值模拟与实验相结合的方法，研究了在设计工况下，周向槽对内部流动和压力脉动的影响。结果表明，采用该方案后，水头降低了1.1%，效率降低了1.0%。然而，周向凹槽为前沿溢流提供了周向通道。槽内流体在低压区附近形成射流，能有效分散叶片进口的低能流体。叶尖泄漏涡(TLV)的初始位置和轨迹向下游移动，减小了相对流动角和低速区。叶尖区的流场得到了显著的改善。周向槽抑制了叶片进口压力面和叶尖间隙的低频压力波动，压力脉动强度分别降低了50%和66%。



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