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| 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 |
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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.
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Received: 11 April 2018
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