Numerical simulations of solid-liquid two-phase flows in centrifugal pump as turbine
JIA Junrui1,2,ZOU Lei3,HUANG Jun3*,SHEN Yong4
1. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 210016, China; 2. Department of Mechatronics, Nantong Vocational & Technical Shipping College, Nantong, Jiangsu 226010, China; 3. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 4. Shandong Xingyuan Mining Equipment Group Co. Ltd., Jining, Shandong 272300, China
Abstract:Numerical simulations were performed on a centrifugal pumpas turbine(PAT)with a specific speed of 82 in ANSYS CFX to investigate characteristics of solid-liquid two-phase flow within the PAT. Nine cases were simulated in terms of particle sizes of 0.1 mm, 0.3 mm, 0.5 mm and solid vo-lume fractions of 5%, 10% and 15%, respectively, by using the Euler-Lagrange model to clarify effects of solid particles on PAT operations. The results show that solid particles are mainly distributed in the blade suction side near the leading edge and the shroud wall as well as in the top wall of cross-sections in the volute.At aconstant particle volume fraction, with increasing particle diameter, the solid volume fraction on the blade surfacesis increased and many particles are accumulated on the blade su-ction side. Under the circumstance, the head and power of the PAT get large and the efficiency is decreased to some degree. At a constant particle diameter, with the increase of solid particle volume fra-ction, solid particles in the impeller passages tend to migrate towards the impellerhub, and the accumulation area is expanded. In such a case, the PAT head and power is increased but the efficiency varies a little. The study has expanded design method of hydraulic turbine, and can provide a reference for design of PAT.
[1]JAIN S V, PATEL R N. Investigations on pump running in turbine mode: a review of the state-of-the-art[J]. Renewable & sustainable energy reviews, 2014, 30(2): 841-868.
[2]SINGH P, NESTMAN F. An optimization routine on a prediction and selection model for the turbine operation of centrifugal pumps[J]. Experimentalthermal and fluid science, 2010, 34: 152-164.
[3]DERAKHSHAM S, NOURBAKHSH A. Experimental study of characteristic curves of centrifugal pumps working as turbines indifferent specific speeds[J]. Journal of experimental thermal and fluid science, 2008, 32: 800-807.
[4]杨孙圣, 李强, 黄志攀,等. 不同比转数离心泵作透平研究[J]. 农业机械学报, 2013, 44(3):69-72.
YANG Sunsheng, LI Qiang, HUANG Zhipan, et al. Research on different specific speed pumps used as turbines[J]. Transactions of the CSAM,2013, 44(3):69-72.(in Chinese)
[5]余江成,姚启鹏,吴剑. 河流泥沙颗粒特性对磨损影响的研究[J]. 水利水电技术, 1999,30(11):37-39.
YU Jiangcheng, YAO Qipeng, WU Jian. Effects of grain characteristics of river silt on abrasion[J].Water resources and hydropower engineering, 1999, 30(11):37-39.(in Chinese)
[6]倪晋仁. 固液两相流基本理论及其最新应用[M]. 北京:科学出版社, 1991.
[7]车德福, 李会雄. 多相流及其应用[M]. 西安:西安交通大学出版社, 2007.
[8]刘春哲,王国光,尹光志,等.离心泵非定常空化流动特性的数值研究[J]. 流体机械,2019,47(7):39-43,26.
Liu Chunzhe,Wang Guoguang,Yin Guangzhi,et al. Numerical study of unsteady cavitating flow characteristics in a centrifugal pump[J]. Fluid machinery, 2019,47(7):39-43,26.(in Chinese)
[9]王勇,曾涛,徐银香,等.固体颗粒对水力旋流器冲蚀磨损特性的影响[J]. 流体机械,2019,47(5):50-55,6.
Wang Yong,Zeng Tao,Xu Yinxiang,et al. Effect of solid particles on the erosion wear characteristics of hydrocyclone[J]. Fluid machinery, 2019,47(5):50-55,6.(in Chinese)
[10]张阁, 周香林, 张济山, 等. 水轮机过流部件用高耐磨涂层制备技术[J]. 表面技术, 2004, 33(1): 4-7.
ZHANG Ge, ZHOU Xianglin, ZHANG Jishan, et al. Synthesis of high wear and corrosion resistance coating for hydraulic turbine transition parts[J].Surface techno-logy, 2004, 33(1): 4-7.(in Chinese)