兰州理工大学学报

兰州理工大学学报 ›› 2024, Vol. 50 ›› Issue (1): 53-59.

• 机械工程与动力工程 • 上一篇    下一篇

过渡流道对串联高速离心泵空化特性的影响

王晓晖*1,2,3, 张凯1, 宋鑫3, 侯常亮3, 李柯剑1   

  1. 1.兰州理工大学 能源与动力工程学院, 甘肃 兰州 730050;
    2.兰州理工大学 土木工程博士后科研流动站, 甘肃 兰州 730050;
    3.新乡航空工业(集团)有限公司, 河南 新乡 453000
  • 收稿日期:2022-04-18 出版日期:2024-02-28 发布日期:2024-03-04
  • 通讯作者: 王晓晖(1986-),男,甘肃天水人,博士,副教授. Email:13919306787@163.com
  • 基金资助:
    国家自然科学基金(51569013),河南省博士后科研启动项目(2021-181),甘肃省杰出青年基金(20JR10RA203)

Research on the effect of inter-stage flow channel on the cavitation characteristics of tandem high speed centrifugal pump

WANG Xiao-hui1,2,3, ZHANG Kai1, SONG Xin3, HOU Chang-liang3, LI Ke-jian1   

  1. 1. School of Energy and Power Engineering,Lanzhou Univ. of Tech., Lanzhou 730050, China;
    2. School of Civil and Engineering postdoctoral research station, Lanzhou Univ. of Tech., Lanzhou 730050, China;
    3. Henan Xinxiang Aviation Industry Group Corporation, Xinxiang 453000, China
  • Received:2022-04-18 Online:2024-02-28 Published:2024-03-04

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摘要： 为分析不同结构的过渡流道对串联高速离心泵空化特性的影响,以某型串联高速离心泵的第2级为研究对象,基于ANSYS Fluent中Zwart-Gerber-Belamri空化模型,采用RNG k-ε双方程湍流模型对同一工况下环形和螺旋形过渡流道在不同空化数下的增压值、叶片空化面积、流道内空泡体积进行了对比分析.结果表明:采用螺旋形过渡流道的次级离心泵在流量区间32 000~64 000 L/h增压值提升约8.5%,大流量工况(qV>52 000 L/h)下效率提升3%~6%.次级叶轮发生完全空化时,相比环形过渡流道,螺旋形过渡流道次级叶轮叶片背面空化面积和流道内空泡体积均有所下降.由此可见,螺旋形过渡流道抑制了叶轮叶片空化气泡的产生,提升了次级叶轮的抗空化性能.

关键词: 过渡流道, 数值模拟, 次级叶轮, 空化数, 空泡体积

Abstract: In order to analyze the influence of transition flow channels of different shapes on the cavitation characteristics of a tandem high-speed centrifugal pump, the second stage of a certain type of series high-speed centrifugal pump was taken as the research object. Based on the Zwart-Gerber-Belamri cavitation model in ANSYS Fluent, RNG k-ε two-equation turbulence model is used to compare and analyze the pressurization value, blade cavitation area, and cavitation volume in the flow channel under different cavitation numbers of annular and spiral transition channels under the same working conditions. The results show that the pressure increase value of the Secondary pump of the spiral transition channel is increased by about 8.5% in the flow range of 32 000~64 000 L/h, and the efficiency is improved by about 3%~6% under the large flow condition (qV>52 000 L/h). When the secondary impeller is completely cavitated, the cavitation area on the back of the secondary impeller blade in the spiral transition channel and the cavitation volume in the channel decreases to a certain extent compared with the annular transition channel. Consequently, it can be seen that the helical transition flow channel inhibits the generation of cavitation bubbles in the impeller blade and improves the anti-cavitation performance of the secondary impeller.

Key words: inter-stage flow channel, numerical simulation, secondary impeller, cavitation number, cavitation volume

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