In order to investigate the effects of diffuser installation position on the hydraulic performance, pressure fluctuation characteristics in the mixed flow pump, eight schemes(C0-C7)of different diffuser installation position are analysed through steady and unsteady simulations by using ANSYS CFX 14.5. Through grid independency analysis, the predicted results of the original scheme C0 has a good agreement with the experimental performance, thus the numerical simulation is reliable. The results show that the diffuser installation position almost has no effects on the head but influences the hydraulic efficiency obviously, and the head of each scheme reaches the design requirement. The hydraulic efficiency of C2 is the largest but that of C7 is the smallest, whose difference is about 2.6%. Each scheme has the same main activating frequency, three times blade passing frequency, but its amplitude is different, the amplitude of C7 is the largest and those of C0 and C2 are similar. Besides, the pressure fluctuation is weakened along the discharge pipe. The pressure fluctuation intensity varies evidently with the change of diffuser installation position, and the maximum in the circular casing occurs near the diffuser leading surface. The pressure fluctuation intensity of C7 is largest, C0 taking the second place, and that of C2 is the smallest. Overall, the diffuser installation position C2 has the optimal performance and pressure fluctuation, which can be a significant reference for installing the diffuser in the mixed flow pump.
GU Yan-Dong,YUAN Shou-Qi,PEI Ji et al. Effects of diffuser installation position on pressure fluctuation in the mixed flow pump[J]. Journal of Drainage and Irrigation Machinery Engin, 2017, 35(2): 93-99.
关醒凡. 现代泵理论与设计[M]. 北京:中国宇航出版社, 2011.
GÜLICH J F. Centrifugal pumps[M]. Berlin: Sprin-ger, 2008.
BEHR T, PORRECA L, MOKULYS T, et al. Multistage aspects and unsteady effects of stator and rotor clocking in an axial turbine with low aspect ratio blading[J]. Journal of turbomachinery, 2006, 128(1): 11-22.
RODRIGUEZ C G, EGUSQUIZA E, SANTOS I F. Frequencies in the vibration induced by the rotor stator interaction in a centrifugal pump turbine[J]. Journal of fluids engineering, 2007, 129(11): 1428-1435.
SCHENNACH O, WOISETSCHLÄGER J, MARN A, et al. Laser-doppler-velocimetry measurements in a one and a half stage transonic test turbine with different angular stator-stator positions[J]. Experiments in fluids, 2007, 43(2/3): 385-393.
SEGALA W, STEL H, HUNGRIA V, et al. Numerical simulation of the flow in a centrifugal pump with a vaned diffuser[C]//Proceedings of ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. New York:American Society of Mechanical Engineers, 2011: 1791-1800.
LONG Y, ZHU R, WANG D, et al. Numerical and experimental investigation on the diffuser optimization of a reactor coolant pump with orthogonal test approach[J]. Journal of mechanical science & technology, 2016, 30(11):4941-4948.
WANG Chunlin, PENG Na, ZHAO Baitong, et al. Influence of relative position of diffuser inlet edge on performance of nuclear model pump [J]. Drainage and irrigation machinery, 2008, 26(5):38-41.(in Chinese)
ZHU Rongsheng, XI Yi, YUAN Shouqi, et al. Position of guide vane trailing edge of nuclear reactor coolant pump under gas-liquid two phase condition [J]. Journal of drainage and irrigation machinery engineering, 2013, 31(6):484-489.(in Chinese)
FU Heng, LU Jinling, CHEN Nan, et al. Numerical simulation on clocking effect of impeller-stator in multistage axial-flow pump [J]. Journal of drainage and irrigation machinery engineering, 2016,34(11):934-940.(in Chinese)
LIU Jianrui,ZHENG Junfeng,FU Dengpeng,et al. Effect of volute tongue-impeller gaps on the unsteady flow in mixed-flow pump[J]. Fluid machinery, 2014,42(3):19-23.(in Chinese)
ISAEV S A, LIPNITSKII Y M, MIKHALEV A N, et al. Simulation of the supersonic turbulent flow around a cylinder with coaxial disks[J]. Journal of engineering physics and thermophysics, 2011, 84(4):827-839.
ISAEV S A, BARANOV P A, PRIGORODOV Y S, et al. Numerical analysis of the influence of the compressibility of a viscous gas on its turbulent flow around a cylinder with a circular vortex cell[J]. Journal of enginee-ring physics and thermophysics, 2008, 81(2):351-358.
PEI Ji, YUAN Shouqi, YUAN Jianping, et al. Comparative study of pressure fluctuation intensity for a single-blade pump under multiple operating conditions [J]. Journal of Huazhong University of Science and Technology(natural science edition), 2013, 41(12):29-33.(in Chinese)
WANG Wenjie, YUAN Shouqi, PEI Ji, et al. Numerical analysis of the clocking effect on the pressure fluctuation in the centrifugal pump with vaned diffuser [J]. Journal of mechanical engineering, 2015,51(4):185-192.(in Chinese)