Abstract:In order to reveal the influence of the different turbulence models on the flow characteristics and noise in the submersible sewage pump, a low specific speed pump with ultra-thick blades was adopted as a model. The computational fluid dynamics(CFD)based on the Lighthill equation theory was adopted to calculate the flow field and sound field respectively. The pressure distribution at different flow rates of 0.6QN, 0.8QN, 1.0QN, 1.2QN, 1.4QN was analyzed, and the causes of noise generation and distribution characteristics in the inner and outer fields were discussed. The results show that the performance curve obtained by SST model is the closest to the test results. When the impeller rotaties from moment a to moment d, the high-pressure area near the tongue increases. The pressure fluctuation at tongue is the most dramatic, indicating that the tongue is the main noise source. The noise is lower near the optimal condition and the larger noise deviates from the optimal condition; The maximum noise appears at 30°-75°, the minimum value oppears at 225°-250°.
蔡晓彤, 施卫东*, 张德胜, 张俊杰, 石磊. 基于直接边界元法的潜水排污泵内流噪声数值模拟[J]. 排灌机械工程学报, 2018, 36(12): 1264-1269.
CAI Xiaotong, SHI Weidong*, ZHANG Desheng, ZHANG Junjie, SHI Lei. Numerical simulation of internal flow-induced noise in submersible sewage pump based on the direct boundary element method. Journal of Drainage and Irrigation Machinery Engin, 2018, 36(12): 1264-1269.
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