Progressive Erosion and Pump Performance Prediction of Double Suction Centrifugal Pump Vane Based on Dynamic Boundary

SHEN Xiaobo, LI Rennian, HAN Wei, CHEN Diyi, SUN Jianghe, TIAN Yaping

Abstract

The change of overflow boundary morphology with erosion time is important to objectively and realistically reflect the erosion characteristics of double suction centrifugal pumps and erosion morphology. The Euler-Lagrange method and the dynamic boundary method of geometric reconstruction of the erosion wall were used to calculate the solid-liquid two-phase flow of the double suction centrifugal pump of Jingtaichuan Pumping Station in Gansu Province under the average sand content and the value of grain size of the Yellow River. The progressive erosion characteristics of the pump vanes were predicted, and the effects of the vane erosion mechanism and the change of wall geometry on the pump performance were analyzed combining the experimental data. The results showed that taking the maximum value of the impact angle function corresponded to the impact angle α0 as a threshold to distinguish erosion patterns. If impact angle was less than the threshold, the erosion pattern was liking a rounded crater, if it was bigger than the threshold, the erosion pattern was liking a groove. The erosion rate was high in areas where the impact angle was in the range 50°~75° and the impact velocity was high, which both led to high level of blade erosion. The prediction period was divided into three phases based on the characteristics of the rate of change of the hydraulic performance loss. The erosion rate had the largest growth rate in the early stages, but the values were orders of magnitude smaller than those in the middle and late stages, so that the head loss rate, efficiency loss rate and mass loss rate of blade in the first 1000 hours of erosion was less than in other stages. All these parameters showed a trend of slow growth in the early stage, fast growth in the middle stage and slow growth in later stage, and maximum growth rate in the middle stage, values of 1.51×10-3, 1.97×10-3, and 4.12×10-3 respectively. Erosion caused the fastest performance degradation of double suction centrifugal pump in the 1000 hours to 6000 hours erosion length range.

 

Keywords: double suction centrifugal pump, vane, progressive erosion, erosion prediction, dynamic boundary

 

Download Full Text:

PDF


References


LI Wei, PAN Yunxin, LI Haoming, et al. Research progress on solid — liquid two-phase flow characteristics and erosion of centrifugal pump[ J]. Journal of Drainage and Irrigation Machinery Engineering, 2023,41(2) :109 - 117. (in Chinese)

HUANG Kai, LIU Dong, YOU Baojian, et al. Research on effects of particle concentrations on the performance and erosion of centrifugal pump [J]. Fluid Machinery, 2022, 50(2) :35 -42. (in Chinese)

ZHANG Zichao, LI Yanpin, CHEN Dexin. Investigation on unsteady erosion characteristics in impeller of double suction centrifugal pump [J]. Transactions of the Chinese Society for Agricultural Machinery, 2022, 53 ( 4 ) : 140 - 148, 191. (in Chinese)

KUMAR J, TIWARI G, RAWAT A, et al. Computational investigation of erosion wear on industrial centrifugal pump handling solid-water flows [j]. Tribology in Industry, 2020,42(3) : 382 -399.

ZHANG Zichao, WANG Fujun, CHEN Xin, et al. Erosion characteristics of double suction centrifugal pump based on modified Eulerian algorithm [J]. Transactions of the Chinese Society for Agricultural Machinery, 2017, 48 ( 3 ) : 124 - 133, 147. ( in Chinese)

LAI Fen, WANG Yu, SAEED A, et al. Numerical study of solid particle erosion in a centrifugal pump for liquid — solid flow [ J ]. Journal of Fluids Engineering, 2019,141(12); 121302.

SONG Xijie, YAO Rao, SHEN Yubin, et al. Numerical prediction of erosion based on the solid — liquid two-phase flow in a double-suction centrifugal pump! J]. Journal of Marine Science and Engineering,2021 ,9(8) *.836.

ZHU Haiwen, ZHU Jianjun, ZHOU Zulin, et al. Experimental study of sand erosion in multistage electrical submersible pump ESP: performance degradation, wear and vibration [ С ]// International Petroleum Technology Conference, Beijing, 2019.

XIAO Yexing, GUO Bao, AHN S H, et al. Slurry flow and erosion prediction in a centrifugal pump after long-term operation [J]. Energies,2019,12(8) : 1523.

OLUWASEUN E A, CARLOS A R D. Prediction of thickness loss in a standard 90° elbow using erosion-coupled dynamic mesh [J]. Wear,2020,460:203400.

ZHU D S, LI Q Q, OU G F, et al. Gas - solid erosion study of elbow pipe based on erosion dynamic grid technology [ J ] . Journal of Applied Fluid Mechanics, 2022,15(6) : 1837 - 1850.

DONG Yunshan, QIAO Zongliang, SI Fengqi, et al. A novel method for the prediction of erosion evolution process based on dynamic mesh and its applications[ J]. Catalysts,2018 ,8( 10) :432.

FABIAN H, OLIVER K, STEFAN R. Numerical prediction of slurry erosion and its influence on prevailing flow conditions using a dynamic mesh method [J] . IOP Conference Series: Earth and Environmental Science, 2021 , 774( 1 ) :012056.

DUARTE CAR, FRANCISCO J. Dynamic mesh approaches for eroded shape predictions J]. Wear, 2020,484:203438. MORSI S A, ALEXANDER A J. An investigation of particle trajectories in two-phase flow systems[ J ]. Journal of Fluid Mechanics, 1972,55(2) : 193 -208.

PENG W , CAO X. Numerical simulation of solid particle erosion in pipe bends for liquid - solid flow [ J ]. Powder Technology, 2016,294:266 -279.

FAETH G. Spray atomization and combustion[ С //24th Aerospace Sciences Meeting, Reno, 1986.

GRANT G, TABAKOFF W. Erosion prediction in turbomachinery resulting from environmental solid particles [J ]. Journal of Aircraft, 1975 ,12(5) :471 -478.

ZHANG Y, REUTERFORS E P, MCLAURY В S, et al. Comparison of computed and measured particle velocities and erosion in water and air flows [ J]. Wear ,2007 ,263 ( 1-6) :330 -338.

ARABEJAD H, MANSOURI A, SIIIRAZI S A,et al. Development of mechanistic erosion equation for solid particles [ J]. Wear,2015,332; 1044 - 1050.

CHEN Yu, LI Rennian, HAN Wei, et al. Progressive erosion of 90y elbow wall based on dynamic boundary[ J]. Journal of Drainage and Irrigation Machinery Engineering, 2024, 42(4) ; 380 -387. (in Chinese)

XIA Y, XU W , YE W, et al. Design and unsteady numerical simulation of variable geometry inlet using dynamic meshes [J ]. Electrical Engineering,2019 ,459:816 -827.

ANSYS, Inc. Fluent, ANSYS 18. 0: user’s guide[Z]. ANSYS, Inc.

MENTER F R. Two-equation eddy-viscosity turbulence models for engineering applications[ J ]. AIAA Journal, 1994 , 32(8) : 1598 - 1605.

SAFFMAN P G. The lift on a small sphere in a slow shear[ J ]. Journal of Fluid Mechanics, 1965, 22(2) -.385 -400.

QIAN Z, SU J, GUO Z,et al. Erosion wear in a double-suction centrifugal pump using an improved erosion model[J]. IOP Conference Series: Earth and Environmental Science, 2022, 1037( 1 ) ;012031.

SIIEN Z, LI R, HAN W , et al. Erosion wear on impeller of double-suction centrifugal pump due to sediment flow J^. Journal of Applied Fluid Mechanics, 2020, 13(4);1131 -1142.


Refbacks

  • There are currently no refbacks.