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.
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