Abstract:Two jet pumps with superlarge arearatios (574 and 6005), respectively, were designed according to the conventional theory and the engineering requirements. Based on the finite volume method, the Realizable k-ε turbulence model with the standard wall function was adopted in the three dimensional flow simulations and structure optimization of the pumps. The simulation results indicated that the best efficiency point moves to a higher flow ratio and the optimum throat length increases with area ratio. Six jet pumps were manufactured according to the optimized parameters; subsequently their performance was tested under different driving pressures. There were six area ratios through the combinations of two size nozzles and three throat diameters. The experimental data show that the fluid flow inside those pumps has selfsimilarity like a conventional jet pump. The existing theory for predicting cavitation flow ratio overestimates the cavitation performance of those pumps, and it needs to be updated. The experimental data agreed well with the simulation results, confirming the reliability of numerical simulation and the feasibility of structure optimization. The investigation into the pumps with super area ratios has extended the application range of jet pumps.
龙新平, 程洪贵, 杨雪龙, 肖龙洲. 超大面积比射流泵性能模拟与试验研究[J]. 排灌机械工程学报, 2012, 30(4): 379-383.
Long-Xin-Ping, CHENG Hong-Gui, YANG Xue-Long, XIAO Long-Zhou. Numerical and experimental investigations on super large area ratio jet pumps. Journal of Drainage and Irrigation Machinery Engin, 2012, 30(4): 379-383.
[1]陆宏圻. 喷射技术理论及应用[M]. 武汉: 武汉大学出版社, 2004.[2]Tadashi N, Yukitaka Y, Hidetoshi K, et al. Flow analysis for single and multinozzle jet pump[J]. International Journal Series B: Special Issue on Jets, Wakes and Separated Flows,2006, 49(4):933-940.[3]Mallela R, Chatterjee D. Numerical investigation of the effect of geometry on the performance of a jet pump[J]. Journal of Mechanical Engineering Science, 2011, 225(7):1614-1625.[4]袁丹青,乌骏,杨敏官,等. 高空化性能多喷嘴射流离心泵的研制[J]. 农业机械学报,2008,39(4):65-68.Yuan Danqing, Wu Jun, Yang Minguan, et al. Development of a high cavitation characteristics and multinozzle jet centrifugal pump[J]. Transaction of the Chinese Society for Agricultural Machinery, 2008,39(4):65-68. (in Chinese)[5]龙新平,姚鑫,杨雪龙.多孔喷嘴射流泵流动模拟与涡结构分析[J].排灌机械工程学报,2012,30(2):136-140.Long Xinping, Yao Xin, Yang Xuelong. Flow simulation and vortex structure analysis of multinozzle jet pumps [J]. Journal of Drainage and Irrigation Machinery Engineering, 2012,30 (2): 136-140. (in Chinese)[6]Yukitaka Yamazaki, Atsushi Yamazaki, Tadashi Narabayashi, et al. Studies on mixing process and performance improvement of jet pumps[J]. Journal of Fluid Science and Technology, 2007, 2(1): 238-247.[7]Long Xinping, Han Ning, Cheng Qian.Influence of nozzle exit tip thickness on the performance and flow field of jet pump[J].Journal of Mechanical Science and Technology, 2008, 22: 1959-1965.[8]黄明全,宋伯明,费文彬.大面积比喷射泵试验研究[J].舰船科学技术,2002,24(3):50-52.Huang Mingquan, Song Boming, Fei Wenbin. Experimental research of large throat area ratio water jet pump[J]. Ship Science and Technology, 2002,24(3):50-52. (in Chinese)[9]Long Xinping, Yao Hao, Zhao Jianfu. Investigation on mechanism of critical cavitating flow in liquid jet pumps under operating limits[J]. International Journal of Heat and Mass Transfer, 2009, 52(9):2415-2420.[10]龙新平, 关云生, 王丰景,等. 补气位置对改善射流泵空化性能的试验[J]. 江苏大学学报:自然科学版, 2009, 30(3):270-273,292.Long Xinping, Guan Yunsheng, Wang Fengjing, et al. Experiment on air supplying position for improvement of jet pump cavitation performance[J]. Journal of Jiangsu University:Natural Science Edition, 2009, 30(3): 270-273, 292. (in Chinese)