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| Numerical simulation of solid-liquid two-phase turbulent flow of swept-back double blades sewage pump |
| Cheng Cheng, Shi Weidong, Zhang Desheng, Cao Weidong, Xing Jin |
| National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract Three-dimensional simulation was performed for the solid-liquid turbulent flow in swept-back double blades sewage pump with Particle model and SIMPLEC algorithm using or via ANSYS-CFX software. The coupling of impeller and volute is established using multiple reference frame. k-ε double turbulence model was applied to predict the liquid-phase, and an algebraic named the dispersed phase zero equation was adopted to predict the solid-phase. Under the solid volume fraction of 5%,10%,15% and 20%, the effect of five different solid particle diameters(0.2,0.4,0.6,0.8,1.0 mm)on the particle distribution in the pump, solid particle′s slip velocity, the wear and tear of flow components, and the influence law of pump hydraulic external characteristic were studied. Under the solid volume fraction of 5%,10%,15%,20%. The results show that with the increase of solid volume fraction, particle trajectory is biased toward the back of suction side. Slip velocity of solid particle is significantly increased on pressure side and Rear shroud near the suction side′s trailing edge, indicating wear of the wall is exacerbated, therefore, the shroud should be thickened In design phase. In addition, solid particle size and solid volume fraction have an influence on the pump hydraulic external characteristic in different degrees:the hydraulic head and pump efficiency drops with the increase of particle side, while the hydraulic head increases and pump efficiency declines with the increase of solid volume fraction. According to the test results, the efficiency of model pump can reach 80% with 11 m head at rated condition.The design of sewage pump meets the requirements, and has reached the leading level in domestic design.
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Received: 17 April 2014
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