Tan Minggao1, Lian Yichao1, Wu Xianfang2, Ding Rong1, Chen Kun3
1.Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China; 3. Ningbo Jushen Pumps Industry Co., Ltd., Ningbo, Zhejiang 315135, China
In order to research the unsteady dynamics in a double channel sewage pump as it transports the solid-liquid two-phase flow, the inner flow double channel sewage pump was numerically simulated by using the mixture multiphase flow model and the developed standard k-ε turbulence model. The pressure fluctuation in the gap flow channel and the impeller radial force under different impeller diameter D2, namely 101, 103 and 105 mm, were studied. The simulation results agree well with the experimental ones, which indicated that the numerical calculation methods can be used to predict the transient dynamics in this pump. The results showed that the dominant frequency of pressure pulsation at monitoring points in gap flow channel is the blade passing frequency before and after adding a moderate amount of particles. The pressure fluctuation intensity at each monitoring point was weakened with particle addition and the maximum reduction was 25.86%. When the pump transports the solid-liquid two-phase flow and the diameter is 105 mm or 101 mm, the distribution and change of impeller radial force are more regular under designed and operation at a small flow rate. When the flow rate of two-phase flow is larger than the design flow rate, the distribution and change of impeller radial force are regular under all diameters. As the flow rate of two-phase flow increases, the vector center of impeller radial force moves from the eighth section to the fourth section of volute and the impeller diameter has little effect on it.
CHENG Xiaorui,ZHANG Nan,ZHAO Weiguo,et al. Pressure fluctuation features of sand particle-laden water flow in volute of double-suction centrifugal pump[J].Journal of drainage and irrigation machinery engineering,2015,33(1):37-42.(in Chinese)
DONG R, CHU S, KATZ J. Relationship between unsteady flow, pressure fluctuations, and noise in a centrifugal pump[J]. Journal of fluids engineering, 1995, 117(1): 24-29.
SHI F, TSUKAMOTO H. Numerical study of pressure fluctuations caused by impeller difuser interaction in a diffuser pump stage[J]. Journal of fluid engineering-transaction of the ASME, 2001,123(9): 466-474.
BARRIO R, PARRONDO J, BLANCO E. Numerical analysis of the unsteady flow in the near tongue region in a volute-type centrifugal pump for different operating points[J].Computers & fluids,2010,39(5): 859-870.
UY R V, BRENNEN C E. Experimental measurements of rotordynamic forces caused by front shroud pump leakage[J]. Journal of fluids engineering, 1999, 121(3):633-637.
JOSÉ González, JORGE Parrondo, CARLOS Santolaria, et al. Steady and unsteady radial forces for a centrifugal pump with impeller tongue gap variation[J]. Journal of fluids engineering, 2006, 128(3): 454-462.
QI Xueyi, YAN Xiaowei, JI Xiaobin, et al. Volume fraction distribution rules for solid-phase in double channel sewage pump[J].Journal of Jiangsu University(natural science edition),2009, 30(2):156-159.(in Chinese)
WU Denghao,YUAN Shouqi,REN Yun,et al.Pressure pulsation and vibration in in-line circulator pumps[J]. Journal of Huazhong University of Science and Technology(natural science edition),2013,41(4):16-20.(in Chinese)