Improvement of Cavitation Characteristics of Centrifugal Pump by Balanced Hole Offset

被引：0
作者：
Wang D. [1 ,2 ]
Liu Z. [1 ,2 ]
Zhao W. [1 ,2 ]
机构：
[1] School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou
[2] Key Laboratory of Fluid Machinery and Systems, Lanzhou, 730050, Gansu Province
来源：
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | 2020年 / 51卷 / 05期
关键词：
Balance hole; Cavitation; Centrifugal pump; Numerical simulation;
D O I：
10.6041/j.issn.1000-1298.2020.05.015
中图分类号：
学科分类号：
摘要：
Cavitation is a physical phenomenon of centrifugal pump internal flow, during the operation of centrifugal pump, cavitation will directly lead to deterioration of hydraulic performance, and it seriously affects the safety and stability of the pump system. Therefore, it is of great significance to seek ways to improve the cavitation performance of centrifugal pump for safe and stable operation of centrifugal pump system. In order to further improve the cavitation characteristics of centrifugal pump, a method to suppress cavitation by moving the balance hole to the back of blade was proposed. According to the characteristics of centrifugal pump cavitation flow field, based on RNG k-ε turbulence model and Zwart-Gerber-Belamri cavitation model, the cavitation flow field with different cavitation numbers in the model before and after balance hole offset was calculated and analyzed. The results showed that compared with the experimental values of the original model, the head was decreased within 4% and the efficiency was decreased within 5% after balance hole offset. The critical cavitation number was decreased after the balance hole offset at flow rates of 1.2Qe, Qe and 0.8Qe. After the offset of balance hole, the distribution of static pressure zone on the back of the blade was changed. And the velocity in the low-pressure area on the back of the blade was reduced, at the same time, the turbulent kinetic energy in the flow passage can be effectively improved and it can inhibit the cavitation at all stages. Balanced hole offset can effectively reduce the volume fraction of the flow passage, improve the flow condition in impeller runner and reduce the blockage of flow passage by cavitation. The bubble volume in impeller was decreasesd obviously after balance hole offset and the fluctuation amplitude was decreased in a rotation period. The axial force was reduced and the mechanical condition of centrifugal pump was improved. © 2020, Chinese Society of Agricultural Machinery. All right reserved.
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页码：142 / 150
页数：8
相关论文
共 26 条
  • [1] JOHANN F G., Centrifugal pumps, (2014)
  • [2] pp. 516-551, (2014)
  • [3] KIM K H, FRANC J P, CHAHINE G, Et al., Advanced experimental and numerical techniques for cavitation erosion prediction, (2014)
  • [4] ZHU B, CHEN H Y., Analysis of the staggered and fixed cavitation phenomenon observed in centrifugal pumps employing a gap drainage impeller, Journal of Fluids Engineering, 139, 3, (2017)
  • [5] SI Qiaorui, YUAN Shouqi, LI Xiaojun, Et al., Numerical simulation of unsteady cavitation flow in the casing of a centrifugal pump, Transactions of the Chinese Society for Agricultural Machinery, 45, 5, pp. 84-90, (2014)
  • [6] WANG Wenting, MENG Genqiqige, LU Hong, Et al., Pressure fluctuation and cavity pattern of transient cavitation flow in a centrifugal pump, China Rural Water and Hydropower, 9, pp. 202-206, (2017)
  • [7] WANG Yong, LIU Houlin, WANG Jian, Et al., Experimental measurement on cavitation pattern at impeller inlet of centrifugal pump, Transactions of the Chinese Society for Agricultural Machinery, 44, 7, pp. 45-49, (2013)
  • [8] WANG Xiuli, YUAN Shouqi, ZHU Rongsheng, Et al., Analysis on transient hydraulic characteristics of cavitation process in centrifugal pumps, Journal of Xi'an Jiaotong University, 46, 7, pp. 38-43, (2012)
  • [9] ZHAO Weiguo, ZHAO Guoshou, XIAN Lixia, Et al., Effect of surface-fitted obstacle in centrifugal pump on cavitation suppression, Transactions of the Chinese Society for Agricultural Machinery, 48, 9, pp. 111-120, (2017)
  • [10] ZHAO Weiguo, ZHAI Lijing, XIA Tian, Et al., Numerical simulation of slotted blade in centrifugal pump on cavitation suppression, Transactions of the Chinese Society for Agricultural Machinery, 49, 12, pp. 150-157, (2018)
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