In order to investigate the gas-liquid two-phase flow characteristics in axial pumps, an axial pump with the specific speed of 1 500 was selected as study object. The two-phase flow in the pump was calculated based on the Eulerian-Eulerian inhomogeneous two-phase model at different flow rates and inlet gas volume fractions(IGVF). The performance of the axial pump was obtained under gas-liquid mixing flow conditions. Meanwhile, the two-phase flow pattern was indicated by analysis of the pressure and gas distribution and velocity distribution of two-phase in the impeller. The results show that the curves of the head and the efficiency display a slight decline with the increase of inlet gas volume fraction. Moreover, under the same air void, the pressure of the pressure face is greater than the suction surface pressure, and the pressure increases from the hub to the rim. And the gas is mainly concentrated on the suction surface of the impeller. With the increase of flow rate, the highest pressure is nearing the flange, the gas on the pressure surface of blade gradually increases, but that on the suction surface is opposite. The pressure surface gas is mainly accumulated on the inlet side and has a tendency to move towards the rim. At the same flow rate, the gas is still mainly concentrated on the suction surface of the impeller. With the increase of air void, the maximum pressure region of the pressure face has a tendency to move from the inlet side to the middle rim, then moves to the impeller outlet along the suction surface. In addition, with the increase of flow rate, the velocity of gas-liquid phase increases, and the flow separation phenomenon appears in the region close to the hub.
TANG Yuan-Feng,YUAN Jian-Ping-*,SI Qiao-Rui et al. Numerical analysis of the two-phase flow(liquid/gas)in axial pump based on Eulerian-Eulerian flow model[J]. Journal of Drainage and Irrigation Machinery Engin, 2018, 36(6): 478-484.
ZHANG Jinya, CAI Shujie, ZHU Hongwu, et al. Experimental study of gas-liquid flow pattern in a helico-axial multiphase pump by visualization[J]. Journal of engineering thermophysics, 2015, 36(9): 1937-1941.(in Chinese)
TREMANTE A, MORENO N, REY R, et al. Numerical turbulent simulation of the two-phase flow(liquid/gas)through a cascade of an axial pump[J]. Journal of fluids engineering, 2002, 124(2):371-376.
CAMPO A, CHISELY E A. Experimental characterization of two-phase flow centrifugal pumps[J]. Journal of bacteriology, 2010, 176(24):7524-7531.
ZHU J, ZHANG H Q. CFD Simulation of ESP perfor-mance and bubble size estimation under gassy conditions[C]//Proceedings of SPE Annual Technical Conference and Exhibition, 2014:2039-2053.
CARIDAD J, KENYERY F. CFD analysis of electric submersible pumps(ESP)handling two-phase mixtures[J]. Journal of energy resources technology, 2004, 126(2):99-104.
CARIDAD J, ASUAJE M, KENYERY F,et al. Chara-cterization of a centrifugal pump impeller under two-phase flow conditions[J]. Journal of petroleum science & engineering, 2008, 63(1):18-22.
CARIDAD J A, KENYERY F. Slip factor for centrifugal impellers under single and two-phase flow conditions[J]. Journal of fluids engineering, 2005, 127(2):317-321.
TREMANTE A, MORENO N, REY R, et al. Numerical performance prediction and experimental validation of an axial pump under two-phase flow(liquid/gas)[C]//Proceedings of ASME Engineering Technology Conferen-ce on Energy, 2002:755-760.
BARRIOS L, PRADO M G. Modeling two phase flow inside an electrical submersible pump stage[C]//Proceedings of ASME International Conference on Ocean, 2009:227-231.
HUANG Si. Numerical calculation of gas-liquid flow in a multistage axial flow pump[J]. Waterhead technology, 2007(6):34-39.(in Chinese)
YUAN Jianping, ZHANG Keyu, SI Qiaorui, et al. Numerical investigation of gas-liquid two-phase flow in centrifugal pumps based on inhomogeneous model[J] Transactions of the CSAM,2017,48(1):89-95.(in Chinese)