Numerical simulation and analysis of solid-liquid two-phase three-dimensional unsteady flow in centrifugal slurry pump

Abstract

Based on RNG k-ε turbulence model and sliding grid technique, solid-liquid two-phase three-dimensional (3-D) unsteady turbulence of full passage in slurry pump was simulated by means of Fluent software. The effects of unsteady flow characteristics on solid-liquid two-phase flow and pump performance were researched under design condition. The results show that clocking effect has a significant influence on the flow in pump, and the fluctuation of flow velocity and pressure is obvious, particularly near the volute tongue, at the position of small sections of volute and within diffuser. Clocking effect has a more influence on liquid-phase than on solid-phase, and the wake-jet structure of relative velocity of solid-phase is less obvious than liquid-phase near the volute tongue and the impeller passage outlet. The fluctuation of relative velocity of solid-phase flow is 7.6% smaller than liquid-phase flow at the impeller outlet on circular path. Head and radial forces of the impeller are 8.1% and 85.7% of fluctuation, respectively. The results provide a theoretical basis for further research for turbulence, improving efficient, reducing the hydraulic losses and wear. Finally, field tests were carried out to verify the operation and wear of slurry pump.

Keywords

slurry pump / solid-liquid two-phase flow / unsteady flow / 3-D full passage / numerical simulation

References

[1] CuiB-l, XuW-j, ZhuZ-c, LinH-chao. Unsteady flow characteristics in low-specific-speed centrifugal pump with complex impeller [J]. Journal of Chemical Industry and Engineering, 2011, 11: 3093-3100

[2] MatthewT S, TomJ SNumerical flow simulation in a centrifugal pump with impeller-volute interaction [C], 2000Boston, USAASME1-7

[3] WuBoResearch on solid-liquid two-phase three-dimensional turbulence and erosion characteristics of slurry pump [D], 2010ChangshaSchool of Mechanical and Electrical Engineering, Central South University

[4] ShoichiroN, KeijiY. Computational simulation of flows in an entire centrifugal heart pump [J]. Artificial Organs, 1999, 23(6): 572-575

[5] CheahK W, LeeT S, WinotoS H, ZhaoZ M. Numerical flow simulation in a centrifugal pump at design and off-design conditions [J]. International Journal of Rotating Machinery, 2007

[6] OlivierP, HakenN. Numerical investigations of unsteady flow in a centrifugal pump with a vaned diffuser [J]. International Journal of Rotating Machinery, 20131-14

[7] ShahS R, JainS V, PatelR N, LakheraV J. CFD for centrifugal pumps: a review of the state-of-the-art [J]. Procedia Engineering, 2013, 51: 710-715

[8] PeiJ, YuanS-q, YuanJ-ping. Numerical analysis of periodic flow unsteadiness in a single-blade centrifugal pump [J]. Science China: Technological Sciences, 2013, 56(1): 212-221

[9] RualB, JorgeP, EduardoB. Numerical analysis of the unsteady flow in the near-tongue region in a volute-type centrifugal pump for different operating points [J]. Computers & Fluids, 2010, 39(5): 859-870

[10] ShiW-d, XuY-d, LiW, ZhangH, HuY-hai. Effect of different tongue angles on unsteady flow in centrifugal pump [J]. Transactions of the Chinese Society for Agricultural Machinery, 2013, 1: 125-130

[11] PeiJ, WangW-j, YuanS-qi. Statistical analysis of pressure fluctuations during unsteady flow for low-specific-speed centrifugal pumps [J]. Journal of Central South University, 2014, 3: 1017-1024

[12] LiuD-yu3-D modeling and CFD simulation of the solid-liquid two-phase flow field of slurry pump [D], 2011KunmingKunming University of Science and Technology1-73

[13] WuB, YanH-z, XuH-l, TanY-qiang. Numerical simulation about erosion characteristics of solid particle in slurry pump [J]. Journal of Central South University: Science and Technology, 2012, 01: 124-129

[14] YuanS-q, YeL-t, ZhangJ-f, YuanY, ZhangW-jie. Influence of splitter blades on unsteady flow characteristics in centrifugal pump [J]. Journal of Drainage and Irrigation Machinery Engineering., 2012, 04: 373-378

[15] XuC-h, WuY-l, ChenN-x, LiuY, ZhangL, WuY-zhen. Simulation of turbulent flow in pump based on sliding mesh and RNG k-e model [J]. Journal of Engineering Thermophysics., 2005, 01: 66-68

[16] ZhangY-l, LiY, CuiB-l, ZhuZ-chao. Computational analysis of hydraulic transmission performance in two-phase flow centrifugal pump [J]. Chinese Journal of Mechanical Engineering, 2012, 48(14): 169-176

[17] ZhangH-l, YeZ-z, XieZhe. Analysis and calculation of axial and radial force in magnetic drive pump [J]. Pump Technology, 2007, 1: 6-10

[18] ZHANG Yu-liang, LI Yi, CUI Bao-lin, ZHU Zu-chao, DOU Hua-shu. Numerical simulation and analysis of solid-liquid two-phase flow in centrifugal pump [J]. Chinese Journal of Mechanical Engineering. 2013, 26(1).