Study on the influence of the specific area of balance hole on cavitation performance of high- speed centrifugal pump
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DOI 10.1007/s12206-020-0725-z
Journal of Mechanical Science and Technology 34 (8) 2020 Original Article DOI 10.1007/s12206-020-0725-z Keywords: · Anti-cavitation performance · Axial force · Balance hole · High-speed centrifugal pump
Study on the influence of the specific area of balance hole on cavitation performance of high- speed centrifugal pump Xiaorui Cheng1,2, Zhengbai Chang1 and Yimeng Jiang1 1
Correspondence to: Xiaorui Cheng [email protected]
Citation: Cheng, X., Chang, Z., Jiang, Y. (2020). Study on the influence of the specific area of balance hole on cavitation performance of high- speed centrifugal pump. Journal of Mechanical Science and Technology 34 (8) (2020) ?~?. http://doi.org/10.1007/s12206-020-0725-z
Received January 14th, 2020 Revised
2
College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, China, Key Laboratory of Fluid machinery and Systems, Lanzhou, China
Abstract
In this paper, the influence of the specific area of balancing hole on the cavitation performance of high-speed centrifugal pump is studied by numerical method. The results show that in the initial cavitation stage, with the increase of the specific area, the head and efficiency of the pump decreases, and the shaft power increases in a small range. The specific area of the balance hole can change the magnitude and direction of the rotor axial force. With the increase of the specific area, the anti-cavitation performance of the pump is weakened, especially when the specific area reaches a certain value, the vortex flow appears in the balance hole, which causes serious distortion of the flow condition at the inlet of the centrifugal impeller. Meanwhile, cavitation also occurs in the balance chamber and is mainly concentrated near the hub of the centrifugal impeller.
May 13th, 2020
Accepted June 10th, 2020 † Recommended by Editor Yang Na
© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2020
1. Introduction The high-speed centrifugal pump is mainly used in the field of aerospace, using high speed to improve the linear speed of impeller outlet, to achieve the purpose of high head. In order to balance the rotor axial force, the balance hole is usually designed in the back cover plate of the centrifugal impeller. However, the balance hole has a certain impact on the performance of the centrifugal pump [1-3]. On the other hand, the balance hole introduces high pressure fluid into the inlet of the centrifugal impeller, which changes the flow condition of the inlet and will have a certain impact on the anti-cavitation performance of the centrifugal impeller. As for the flow characteristics in the balance hole, relevant scholars have done some researches. Cao et al. [4] studied the pressure pulsation characteristics of low specific speed centrifugal pump with radial return balance hole, and found that the pressure pulsation at the separating tongue of volute can be improved by using radial balance hole. Liu et al. [5, 6] pointed out that the liqui
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