摘要 The slurry pump is the key component of a dredger. Solid particles have strong influence on the performance of a slurry pump. The movement of solid particles in a centrifugal impeller was studied using particle image velocimetry (PIV) measurement. The experiments were conducted in a dredging pump model at Hohai University. Some transparent glass spheres with diameter of 02-04 mm were used as solid particles. The concentration and relative velocities of the particles were analyzed to investigate the particle trajectory. The results show that the concentration of the particles on the pressure surfaces of the blades is higher than on the suction surfaces, and the particles tend to move towards the suction surfaces. Moreover, the particles have faster relative velocities than the liquid phase through the flow channels of the impeller.
[1]NI F S, YANG N H, SUN D D. Development on study to solidliquid pump[J]. Mining & processing equipment, 2006, 34 (2): 67-69.
[2]ZHANG Jingzhai, WANG Jun, YANG Jun. Recent progress in liquidsolid two phase flow pump research[J]. Energy research and information, 2014, 30(1): 1-6,17.
[3]WANG Q H, YANG Q H, WU X C, et al. Research progress of particle rotation characteristics in multiphase flows[J]. CIESC journal, 2011, 62(9): 2381-2390.
[4]ZHU J X, ZHAO J T. Calculation of solid particle motion in impeller of centrifugal pump[J]. Pump technology, 1989 (3): 14-20.
[5]XU H Y, CHEN X M, WANG L, et al. A study on motion of solid particles in centrifugal pump impeller[J]. Fluid engineering, 1992, 20(7):1-7.
[6]WEI J J, JIANG P Z. Experimental study on the motion of solid patricles in a centrifugal pump impeller[J]. Pump technology, 1998 (6): 3-5.
[7]ITAYA T, NISHIKAWA T. Study on the sand pump: on the trajectories of solid particles in the pump impeller [J]. Transactions of JSME,B, 1963, 29 (7): 1786-1794.
[8]CAI B Y. Theory and design of twophase flow centrifugal pump[J]. Chinese science bulletin, 1983(8): 498-502.
[9]XU J R, LUO Q. Relative motion between solid particles and liquid medium in hydrocyclones part Ⅱ: effect of particle features and flow field characteristics[J]. The Chinese journal of nonferrous metals, 1998, 8(4): 691-694.
[10]HAN W, JIN Y, LI R N, et al. Effects of particles on pressure fluctuation characteristics in centrifugal pump[J]. Journal of drainage and irrigation machinery engineering, 2015, 33(6): 467-474, 487.
[11]YANG M G, WU C F, GAO B, et al. Distribution feature experiment of saltout crystal particles in a centrifugal pump impeller[J]. Journal of Jiangsu University(natural science edition), 2011, 32(5): 528-532.
[12]GAO B, YANG M G, FENG L, et al. Saltout particle flow field in a vortex pump by PIV measurement[J]. Transactions of the CSAM, 2011, 42(11): 81-84.
[13][JP3]TIAN A M, XU H Y. Research on the law of wear and tear of the impellers of centrifugal pumps for grout handling[J]. Northeast coal technology, 1998 (1): 43-46.
[14]LI Y, ZHU Z C, HE Z H, et al. Abrasion characteristic analyses of solidliquid twophase centrifugal pump [J]. Journal of thermal science, 2011, 20(3): 283-287.