排灌机械工程学报

作者：ZHAO Weiguo，HAN Xiangdong，FU Yidong

单位：School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; School of Power and Mechanical Engineering, Wuhan University, Wuhan, Hubei 430072, China; Hekou District Comprehensive Administrative Law Enforcement Bureau, Dongying, Shandong 257200, China

关键词：centrifugal pump, silt particles, cavitation flow, numerical simulation, promoting

Based on numerical method, effects of silt particle with certain silt mean diameter and silt concentration on the evolution of cavitation in a centrifugal pump were studied. Silt mean diameter 0.005 mm and silt concentration 1.0% were adopted in numerical simulations. Capitaton flow in a flat-nosed cylinder was simulated to validate the designed algorithm. Cavitaton flows of water and silt-laden water were simulated and compared. The results indicate that the silt particles promote the evolution of cavitation. At the outlet pressure of 6.0?105 Pa, cavitation bubbles do not exist in the water flow, but a few cavitation bubbles appeare in the silt-laden water flow, demonstrating the silt particles induce the formation of cavitation bubbles. At the outlet pressure of 5.29?105 Pa, the vapor volume fraction in the silt-laden water flow is much larger than that in the water flow, indicating that the silt particles enhanc the evolution of cavitation. The properties of silt particle, static pressure, flow field structure, turbulent kinetic energy and density difference have a close relationship with the evolution of cavitation.

来源：2019年第5期

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