Abstract：To study the cavitation range of large-scale drainage pumps system, based on SST k-ω turbulence model, the pumps internal cavitation is described by using the Rayleigh-Plesset model, combined with the model pump experiment to verify the numerical results. Also, the emphasis is put on the distribution of cavitation, cavitation volume fraction under the same inlet water level and different flow coefficients, and blades surface pressure distribution under the large flow conditions. The result shows that under the optimal conditions, when the flow coefficients(δ)are 0.8 and 1.0, blades angles of the non-cavitation ranges are-8°-0° and-8°-+6°; the cavitation range rapidly expands for lowering the inlet water level; on the contrary, the range will decrease. However, under the larger flow conditions, the more the blades angle deviation from 0° is, the greater the volume fractions are conditions under the larger flow. What’s more, when the water level is up to the highest flood control water level, the biggest operation flow is 28.75 m3/s in non-cavitation conditions; and the blades surface pressure distribution will increase as the blades running angle enlarges under the large flow conditions. The results can provide a reference for the stable operation of the large-scale drainage pumps system.
燕浩, 柴立平, 李跃, 李强, 石海峡. 大型排水泵装置空化区间的数值计算[J]. 排灌机械工程学报, 2016, 34(8): 679-685.
YAN Hao, CHAI Liping, LI Yue, LI Qiang, SHI Haixia. Numerical calculation on cavitation range of large-scale drainage pumps system. Journal of Drainage and Irrigation Machinery Engin, 2016, 34(8): 679-685.
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