The tip leakage flow (TLF) generated by the tip clearance has adverse effect on the performance of the impeller and increases pressure fluctuation. To suppress the effect of TLF on the instable flow in a semi-open centrifugal pump, the circumferential groove method is proposed in this paper. The effect of the circumferential groove on the internal flow and pressure fluctuation under the design condition is studied by combining numerical simulation with experiment. The results show that the head and efficiency were reduced by 1.1% and 1.0%, respectively. However, the circumferential groove provided a circumferential channel for leading edge overflow. The fluid in the groove formed a jet near the low-pressure region, which can effectively disperse the low-energy fluid of the blade inlet. The initial position and trajectory of the tip leakage vortex (TLV) move downstream, which decreases the relative flow angle and low-velocity region. The flow field in the blade tip region was improved remarkably. The low-frequency pressure fluctuation in the pressure surface and tip clearance of the blade inlet was suppressed by the circumferential groove, and pressure pulsation intensity decreased by 50% and 66%, respectively.
FengJGeZYangH, et al. Rotating stall characteristics in the vaned diffuser of a centrifugal pump. Ocean Eng2021; 229: 108955.
2.
ParikhTMansourMThéveninD.Investigations on the effect of tip clearance gap and inducer on the transport of air-water two-phase flow by centrifugal pumps. Chem Eng Sci2020; 218: 115554.
3.
AyadAFAbdallaHMEl-Azm AlyAA.Effect of semi-open impeller side clearance on the centrifugal pump performance using CFD. Aerosp Sci Technol2015; 47: 247–255.
4.
CaoPWangYKangC, et al. Investigation of the role of non-uniform suction flow in the performance of water-jet pump. Ocean Eng2017; 140: 258–269.
5.
ZhaoSFLuXGZhuJQ, et al. Investigation for the effects of circumferential grooves on the unsteadiness of tip clearance flow to enhance compressor flow instability. Proceedings of the ASME Turbo Expo 2010: Power for land, Sea, and air. Volume 7: Turbomachinery, Parts A, B, and C. Glasgow, UK, 2010. pp.269–277.
6.
GaoYQChuWLZhangHG.The influence of the tip clearance to a Low-Speed centrifugal impeller performance and the flow field analysis of the near Trailing Edge. Mach Des Manuf2013; 24: 1065–1076.
7.
LiYHuPLiR, et al. Numerical analysis for effects of different blade tip clearance on performance in mixed-flow pump. Trans Chin Soc Agric Eng2014; 30: 86–93.
8.
ZhangDShiLShiW, et al. Numerical analysis of unsteady tip leakage vortex cavitation cloud and unstable suction-side-perpendicular cavitating vortices in an axial flow pump. Int J Multiphase Flow2015; 77: 244–259.
9.
ZhangDSShiWDChenB, et al. Unsteady flow analysis and experimental investigation of axial-flow pump. J Hydrodyn2010; 22: 35–43.
10.
ZhangDShiW(Bart) van EschBPM, et al. Numerical and experimental investigation of tip leakage vortex trajectory and dynamics in an axial flow pump. Comput Fluids2015; 112: 61–71.
11.
SchleerMSongSJAbhariRS.Clearance effects on the onset of instability in a centrifugal compressor. ASME J Turbomach2008; 130(3): 031002.
12.
YamanishiNFukaoSQiaoX, et al. LES simulation of backflow vortex structure at the inlet of an inducer. ASME J Fluids Eng2007; 129(5): 587–594.
13.
MioriniRLWuHKatzJ.The internal structure of the tip leakage vortex within the rotor of an axial waterjet pump. ASME J Turbomach2012; 134(3): 031018.
14.
WuHMioriniRLTanD, et al. Turbulence within the Tip-Leakage vortex of an axial waterjet pump. AIAA J2012; 50: 2574–2587.
15.
WuHMioriniRLKatzJ.Measurements of the tip leakage vortex structures and turbulence in the meridional plane of an axial water-jet pump. Exp Fluids2011; 50: 989–1003.
16.
ShiLZhangDSChenJ, et al. Application and verification of density correction method based filter based method for numerical simulation of cavitation in tip region of axial-flow pump. J Vib Shock2016; 35(14): 41–46.
17.
LiuYTanL.Spatial–temporal evolution of tip leakage vortex in a mixed-flow pump with tip Clearance. J Fluids Eng Trans2019; 141: 081302.
18.
LiuYTanL.Theoretical Prediction model of tip leakage vortex in a mixed flow pump with tip Clearance. J Fluid Eng2020; 142: 021203.
19.
YangC.Inlet recirculation influence to the flow structure of centrifugal impeller. Chin J Mech Eng2010; 23(05): 647–654.
20.
HaoYTanL.Symmetrical and unsymmetrical tip clearances on cavitation performance and radial force of a mixed flow pump as turbine at pump mode. Renew Energy2018; 127: 368–376.
21.
HanYTanL.Dynamic mode decomposition and reconstruction of tip leakage vortex in a mixed flow pump as turbine at pump mode. Renew Energy2020; 155: 725–734.
22.
XuYTanLLiuY, et al. Pressure fluctuation and flow pattern of a mixed-flow pump with different blade tip clearances under cavitation condition. Adv Mech Eng2017; 9(4): 1–12.
23.
LiWLiEJiL, et al. Mechanism and propagation characteristics of rotating stall in a mixed-flow pump. Renew Energy2020; 153: 74–92.
24.
YamamotoKTsujimotoY.Backflow vortex cavitation and its effects on cavitation instabilities. Int J Fluid Machinery Syst2009; 2: 40–54.
25.
LuJLGuoLWangLK, et al. Unsteady flow characteristics of tip clearance in semi-open impeller centrifugal pump. Trans Chin Soc Agric Mach2019; 50: 163–172.
26.
LiuLLiJNanX, et al. The stall inceptions in an axial compressor with single circumferential groove casing treatment at different axial locations. Aerosp Sci Technol2016; 59: 145–154.
27.
Van de WyerNFarkasBDessetJ, et al. Experimental Investigation of the Steady and Unsteady Flow Field in a Single Stage Low Pressure Axial Compressor With a Circumferential Groove Casing Treatment. In: Proceedings of the ASME Turbo Expo 2010: Power for Land, Sea, and Air. Volume 7: Turbomachinery, Parts A, B, and C. Glasgow, UK, 14–18 June 2010; pp. 487–499.
28.
NanXMaNLiJ, et al. Evaluation of the effectiveness of typical casing treatments for a low-speed compressor by an integral method. Aerosp Sci Technol2016; 52: 234–242.
29.
RolfesMLangeMVogelerK, et al. Experimental and numerical investigation of a circumferential groove casing treatment in a Low-Speed axial research compressor at different tip clearances. J Turbomach Trans2017; 139(12): 121009.
30.
ChuWLLuXGWuYH.Numerical and experimental investigations of the flow in a compressor with circumferential grooves. J Aerosp Power2006; 21: 100–105.
31.
MullerMWBielaCSchifferHP, et al. Interaction of rotor and casing treatment flow in an axial single-stage transonic compressor with circumferential grooves. Proceedings of the ASME Turbo Expo 2008: Power for land, Sea, and air. Volume 6: Turbomachinery, Parts A, B, and C. Berlin, Germany, 9–13 June 2008, pp.67–78.
32.
MileshinVBrailkoIStartsevA, et al. Application of casing circumferential grooves to counteract the influence of tip clearance. Proceedings of the ASME Turbo Expo 2008: Power for land, Sea, and air. Volume 6: Turbomachinery, Parts A, B, and C. Berlin, Germany, 2008, June 9–13, pp.617–627.
33.
HwangYKangSHAsme. Numerical Study on the Effects of Casing Treatment on Unsteadiness of Tip Leakage Flow in an Axial Compressor. Proceedings of the ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. Volume 8: Turbomachinery, Parts A, B, and C. Copenhagen, Denmark, 11–15 June, 2012, pp.2501–2511.
34.
MaoXLiuBZhaoH.Numerical analysis of the circumferential grooves casing treatment in a counter-rotating axial flow compressor. Appl Therm Eng2018; 130: 29–39.
35.
WangLLuJLiaoW, et al. Numerical analysis of the formation mechanism and suppression method of the reverse flow in a semi-open centrifugal pump. J Mech Sci Technol2020; 34: 3667–3678.
