Analysis of the influence of the position of the impeller inlet on the performance of the self-priming pump

Abstract

Abstract: In order to study the effect of the gas-liquid mixing capacity of the self-priming pump impeller on the self-priming performance, based on the original model of the impeller, five model schemes with different positions of the blade inlet edge are designed. The VOF multiphase flow model is used to calculate the three-dimensional constant value of the whole basin with different schemes, and the law of influence on the self-priming performance is studied. For the 350WFB-1200-50 external-mixing non-sealed self-priming pump, the initial conditions are set to include a certain volume of air section in the inlet S-shaped elbow, and a gas content monitoring point is set at the outlet. The results show that for the medium and high specific speed impeller, the position of the rear cover of the inlet edge is swept forward to the outlet, so that the fluid is loaded at the inlet side of the impeller, which can effectively improve the gas-liquid mixing capacity of the impeller and shorten the self-priming of the self-priming pump time. Changing the position of the inlet side within a certain forward sweep angle has little effect on the head and efficiency of the self-priming pump, but when the blade inlet side is swept forward to the outlet position beyond a certain range, the head of the self-priming pump will decrease significantly. When the inlet side of the impeller is swept forward by 10°, the self-priming time under rated conditions is shortened by 25%, and the self-priming performance is significantly improved.

Key words: self-priming pumps, inlet side position, numeral calculations, gas-liquid two-phase flow, self-priming time

CLC Number:

CHENG Xiao-rui, LIU Ming-jian, YANG Deng-feng. Analysis of the influence of the position of the impeller inlet on the performance of the self-priming pump[J]. Journal of Lanzhou University of Technology, 2022, 48(6): 55-62.

References

[1] 施卫东,关醒凡.流体动力密封的理论与设计 [J].动力工程学报,1996,16(4):55-58.
[2] 吕智君,兰才有,王福军.自吸泵研究现状及发展趋势 [J].排灌机械,2005,23(3):1-5.
[3] JIA X Q,CUI B L,ZHANG Y L,et al.Study on internal flow and external performance of a semi-open impeller centrifugal pump with different tip clearances [J].International Journal of Turbo and Jet-Engines,2015,32(1):1-12.
[4] 宫恩祥,田海平,汪润生,等.无泄漏立式自吸泵结构特点与设计改进 [J].排灌机械,2008,26(2):36-39.
[5] BARRIO R,PARRONDO J,BLANCO E.Numerical analysis of the unsteady flow in the near-tongue region in a volute-type centrifugal pump for different operating points [J].Computers and Fluids,2010,39(5):859-870.
[6] 付强.核主泵叶轮叶片进口边位置对气液两相流动特性的影响 [J].核动力工程,2016,37(3):87-93.
[7] CHENG X R,JIA N N,LÜ B R,et al.Effect of meridian plane dip angle of the variable pitch inducer blade on cavitation performance of high-speed centrifugal pump [J].Journal of the Brazilian Society of Mechanical Sciences and Engineering,2020,42(5):1-13.
[8] 程效锐,陈红杏,王晓全.空间导叶面积变化规律对井用潜水泵性能的影响 [J].中国农村水利水电,2020(5):133-138.
[9] 刘洪生,苏永升.自吸泵自吸过程气液两相流数值模拟分析 [J].华东理工大学学报(自然科学版) ,2017,43(2):280-285.
[10] 司乔瑞,崔强磊,袁建平,等.气液两相入流条件下离心泵内部流动诱导特性实验研究 [J].振动与冲击,2019,38(9):15-21.
[11] 袁建平,邓凡杰,张克玉,等.气液两相流下叶片泵内部流动研究现状 [J].排灌机械工程学报,2019,37(7):553-561.
[12] 闫思娜,罗兴锜,冯建军,等.含气率对气液两相流离心泵性能的影响 [J].水动力学研究与进展(A辑) ,2019,34(3):353-360.
[13] JIA X Q,CUI B L,ZHANG Y L,et al.Study on internal flow and external performance of a semi-open impeller centrifugal pump with different tip clearances [J].International Journal of Turbo and Jet-Engines,2015,32(1):1-12.
[14] 刘建瑞,向宏杰,刘亮亮,等.叶轮几何参数对自吸泵自吸性能影响的数值分析 [J].中国农村水利水电,2012(2):90-93.
[15] 刘宜,李永乐,韩伟,等.离心泵的进口几何参数对泵空化性能的影响 [J].兰州理工大学学报,2011,37(1):50-53.
[16] 赵万勇,郭强.叶片进口边位置对离心泵性能的影响 [J].排灌机械工程学报,2019,37(7):568-573.
[17] 王洋,李亚成,曹璞钰,等.M型截面流道对旋涡泵性能的影响分析 [J].农业机械学报,2014,45(3):77-77.
[18] 崔玉松,司艳雷,易同祥,等.旋流自吸泵气液分离室结构对性能影响的预测 [J].排灌机械,2009,27(2):119-123.
[19] 范宗霖.自吸泵的自吸性能及自吸时间计算 [J].甘肃工业大学学报,1992,18(2):5-15.
[20] 王春林,吴志旺,司艳雷,等.旋流自吸泵气液两相流数值模拟 [J].排灌机械,2009,27(3):163-167.
[21] 江帆,黄鹏.Fluent高级应用与实例分析 [M].北京:清华大学出版社,2008.
[22] 赵伟国,赵富荣,路佳佳.叶片背面不连续凸起对轴流泵空化的控制研究 [J].工程热物理学报,2021,42(1):96-105.
[23] 李红,徐德怀,涂琴,等.自吸泵启动过程气液两相流动的数值模拟 [J].农业工程学报,2013,29(3):77-83.
[24] 黄思,王宏君,郑茂溪.叶片式混输泵气液两相流及性能的数值分析 [J].华南理工大学学报 (自然科学版),2007,35(12):11-16.