Numerical analysis and experiment of jet-pump in conditions of complete characteristic
OU Mingxiong1,2, JIA Weidong1,2, QIU Baijing1, GUAN Xianpin1
1.Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. Synergistic Innovation Center of Modern Agricultural Equipment and Technology of Jiangsu Province, Zhenjiang, Jiangsu 212013, China
Abstract：To investigate the performance and inner flow pattern of jet-pump in conditions of complete characteristic, this paper presents an experimental and numerical research on jet-pump. The results reveal that the outlet static pressure of numerical model has a nearly negative linear relationship with the flow ratio, the numerical simulation method based on Realizable k-ε turbulent model predicted the non-dimensional performance precisely compared with the experimental data, and the pressure ratio also has a nearly negative liner relationship with the flow ratio. Under the positive pressure ratio and flow ratio status, the relative errors between numerical model and experiment increase with the growth of flow ratio, the maximum of error is about 0.26; under the positive pressure ratio and negative flow ratio status, the relatively errors are small and stable, the minimum of error is about 0.02. Around the best efficiency work condition, the velocity vector distributions of suction chamber are relatively uniform, the local vortex appears in suction chamber obviously while the flow ratio decreased. The numerical results reveal that the axial velocity uniformities of the throat chamber inlet section are obviously higher than those of other sections afterwards, the axial velocity uniformities of the middle section and afterwards in throat chamber are relatively even, and the momentum exchange process is almost complete before the middle section in the throat chamber.
[1]LU Xinxiao, WANG Deming. Experimental investigation on liquid absorption of jet pump under operating limits[J]. Vacuum, 2015, 114(1):33-40.[2]WANG Xiaodong, DONG Jingliang. Numerical study on the performances of steam-jet vacuum pump at different operating conditions[J]. Vacuum, 2010, 84(3): 1341-1346.[3]邱白晶,马靖. 在线混药喷雾系统混药性能试验[J]. 农业工程学报, 2014,30(17):78-85. QIU Baijing, MA Jing. Experiment on mixing perfor-mance of online mixing spray system[J]. Transactions of the CSAE, 2014, 30(17): 78-85.(in Chinese)[4]陆宏析,高传昌.射流泵全特性曲线的研究[J].流体机械,1996,24(1):10-14. LU Hongqi, GAO Chuanchang. Studies on the complete characteristic performances of jet pump[J]. Fluid machinery, 1996,24(1):10-14.(in Chinese)[5]XU Cong.Prediction of the pumping capacity for reverse-flow diverter pumps[J]. Chemical engineering research & design, 2014, 92(7):1219-1226.[6]FAN J, EVES J. Computational fluid dynamic analysis and design optimization of jet pumps[J]. Computers & fluids, 2011,46(1):212-217.[7]向清江, 袁寿其, 何培杰,等. 液气射流泵内部流场的数值计算[J]. 江苏大学学报(自然科学版), 2008, 29(3):231-235. XIANG Qingjiang, YUAN Shouqi, HE Peijie, et al. Numerical simulation of liquid jet gas pump[J]. Journal of Jiangsu University(natural science edition), 2008, 29(3):231-235.(in Chinese)[8]TANG K, FENG Y. Performance comparison of jet pumps with rectangular and circular tapered channels for a loop-structured traveling-wave thermoacoustic engine[J]. Applied energy, 2015, 148(2):305-313.[9]欧鸣雄,贾卫东. 射流混药装置变工况流场特性试验与数值分析[J].农业机械学报,2015, 46(9):107-111. OU Mingxiong, JIA Weidong. Experiment and numerical analysis of flow field in jet mixing device under va-riable working conditions[J]. Transactions of the CSAM, 2015,46(9):107-111.(in Chinese)[10]徐维晖,高传昌. 脉冲液体射流泵装置性能试验研究[J]. 核动力工程,2010,31(4):48-52. XU Weihui, GAO Chuanchang. Experimental study on performance of pulsed liquid jet pump[J]. Nuclear power engineering, 2010,31(4):48-52.(in Chinese)[11]AJMAL S, CHUGHTAI I R.Experimental and numerical analysis of steam jet pump[J]. International journal of multiphase flow, 2011,37(10):1305—1314.[12]吕忠斌, 王洋, 刘洁琼,等. 射流泵喷嘴收缩角的取值[J]. 江苏大学学报(自然科学版), 2015, 36(3):281-287. LYU Zhongbin, WANG Yang, LIU Jieqiong, et al. Value of nozzle falloff angle of jet pump[J]. Journal of Jiangsu University(natural science edition), 2015, 36(3):281-287.(in Chinese)[13]程军明, 吴伟烽, 聂娟,等. 气泡在静水中上升破裂产生射流特性的数值模拟[J]. 江苏大学学报(自然科学版), 2014, 35(5):513-517. CHENG Junming, WU Weifeng, NIE Juan, et al. Numerical simulation of bubbles rising and bursting under buoyancy effect in static water[J]. Journal of Jiangsu University(natural science edition), 2015, 36(3):281-287.(in Chinese)[14]ANDREA M, WALTER B. Numerical investigation on a jet pump evolving liquid lead for GEN-IV reactors[J]. Nuclear engineering & design, 2014, 280:608-618.[15]陆宏圻. 喷射技术理论及应用[M]. 武汉:武汉大学出版社, 2004.
