吉林大学学报(工学版) ›› 2018, Vol. 48 ›› Issue (4): 1114-1123.doi: 10.13229/j.cnki.jdxbgxb20170216

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Model experimental analysis of pressure pulsation in vertical mixed-flow pump system

XIE Chuan-liu1, TANG Fang-ping1, SUN Dan-dan2, ZHANG Wen-peng1, XIA Ye1, DUAN Xiao-hui1   

  1. 1.School of Hydraulic Energy and Power Engineering, Yangzhou 225009, China;
    2.Xuzhou Water Conservancy Architectural Design & Research Institute, Xuzhou 221000, China;
  • Received:2017-03-09 Online:2018-07-01 Published:2018-07-01

Abstract: In order to study the internal pressure pulsation characteristics of vertical mixed-flow pump, by model test, the impeller inlet and vane outlet pressure pulsations were collected with different impeller blade placement angles of -2°, 0° and 2°. By Fourier transformation we found that the peak values of the pressure pulsation of the impeller inlet and vane outlet have certain regularity. With different blade placement angles, the peak value of the pressure pulsation of the impeller inlet is always larger than that of vane outlet, especially in small flow area. The micro and macro stability relationship of the pump is established by comparing the peak value of the pressure pulsation with the head and shaft power variance, and the stability of the pump can be obtained from the pressure pulsation in the vicinity of the high efficiency area. However, both in large and small flow areas, the pressure pulsation is no longer able to reflect the stability of the pump. By analyzing the frequency domain map, we can get four conclusions. First, the impeller inlet is affected by the number of blades, mainly by blade frequency. Second, the vane outlet is less affected by the number of vanes. Third, the amplitude of pressure pulsation of vane outlet approaches maximum at one times of the frequency. Last, the pulsation frequency is smaller under the optimal working point of each blade. Under each blade angle of the pump efficient area, the peak value of the pulsation of the impeller inlet and vane outlet reaches the minimum. When under 1.15 times of the optimum flow rate, the peak value reaches maximum. The impeller inlet is about 1.24 times of the peak value in the optimal working condition, while, the vane outlet maximum is about 1.57 times. The best run area of the mixed-flow pump is 0.75 to 1.15 times of the optimal head. The peak value of pressure pulsation is obviously increased when the running head is out of this range.

Key words: mechanical design, vertical mixed-flow pump system, model test, pressure pulsation relative amplitude, peak-peak value, frequency domain diagram

CLC Number: 

  • TH313
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