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°.
CAI Xiao-Tong,SHI Wei-Dong-*,ZHANG De-Sheng et al. Numerical simulation of internal flow-induced noise in submersible sewage pump based on the direct boundary element method[J]. Journal of Drainage and Irrigation Machinery Engin, 2018, 36(12): 1264-1269.
YUAN Danqing, SHI Rong, HAN Yongtao, et al. Design and optimization of new type space guide vanes for deep well centrifugal pump[J]. Journal of Jiangsu University(natural science edition), 2015, 36(6): 661-665.(in Chinese)
LI Yue, SHI Weidong, HAN Xiaoxiao, et al. Effects of pump hydraulic structure on vibration characteristic of series-parallel centrifugal pump[J]. Journal of drainage and irrigation machinery engineering, 2015, 33(9):744-749.(in Chinese)
SI Qiaorui, YUAN Shouqi, YUAN Jianping,et al. Study on the influence of volute to flow-induced noise in centrifugal pump[J]. Advanced materials research, 2012, 516: 1009-1017.
GIOVANNA Cavazzini. Roter-stator interaction in radial turbomachines: experimental and numerical investigation[M]. Lap Lambert Academic Publishing, 2013.
GAO Bo, YANG Minguan, LI Zhong, et al. Experimental study on cavitation induced low frequency vibration in a centrifugal pump[J]. Journal of engineering thermophysics, 2012, 33(6): 965-968.
JOSE Gonzalez, JOAQUIN Fernandez,EDUARDO Blanco,et al. Numerical simulation of the dynamic effects due to impeller-volute interaction in a centrifugal pump[J]. Transactions of the ASME,2002,124(2):348-355.
ATIFI A, BENMANDSOUR S, BOIS G, et al. Numei-rical and experimental comparison of the vaned diffuser interaction inside the impeller velocity field of a centrifugal impeller[J]. Science China, 2011, 54(1): 1-9.
DAZIN A, CAVAZZINI G, PAVESI G, et al. High-speed stereoscopic PIV study of rotating instabilities in a radial vaneless diffuser[J]. Experiments in fluids, 2011, 51: 83-93.
WANG Yong, LIU Qing, LIU Dongxi, et al. Analysis of flow induced vibration and noise in centrifugal pumps with different blade inlet incidence angle[J]. Fluid machinery, 2013,41(7):1-4.(in Chinese)
JORGE P,JAVIER P,RAÙL B,et al. A simple acoustic model to characterize the internal low frequency sound field in centrifugal pumps[J]. Applied acoustics,2011,72:59-64.
CHU S, DONG R, KATZ J. Relationship between unsteady flow, pressure fluctuations, and noise in a centrifugal pump——part A: Use of PDV data to compute the pressure field[J]. Journal of fluids engineering, 1995, 117(1):24-29.
CHU S, DONG R, KATZ J. Relationship between unsteady flow, pressure fluctuations, and noise in a centrifugal pump——part B: effects of blade-tongue interactions[J]. Journal of fluids engineering, 1995, 117(1):30-35.
DONG R,CHU S,KATZ J. Effect of modification to tongue and impeller geometry on unsteady flow, pressure fluctuations, and noise in a centrifugal pump[J]. ASME Journal of fluids engineering,1997, 119(3):506-515.