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Analysis of flow field characteristics of adjustable micro-dripper based on CFD |
HOU Shiwen1,ZHANG Pengyang2,LI Liang1*,WANG Shifeng1,ZHU Junfeng1 |
1. Institute of Water Resources for Pastoral Area, Ministry of Water Resources, Hohhot, Inner Mongolia 010020, China; 2. Zhongxi Branch, China Resources Power Investment Co. Ltd., Zhengzhou, Henan 450000, China |
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Abstract Aiming at the problem of irrigation efficiency in north arid and dry areas, a kind of mecha-nically adjustable micro-dripper was designed. In order to explore the distribution characteristics of flow field inside micro-dripper under different working conditions, the CFD method was used and the stan-dard k-ε model was chosen to simulate the internal flow field of the micro-dripper. The internal flow field distribution characteristics of the dripper with inlet lengths of 1.5 mm, 3.0 mm, and 4.5 mm, and inlet boundary conditions of 10 kPa, 30 kPa, and 50 kPa, respectively, were analyzed. The results show that the space volume of the internal energy-dissipating chamber of the mini-dripper gradually decreases with the increase of the mating length, the proportion of space in the ″dead-flow zone″ gradually decreases, the impurity accumulation rate inside the emitter drops. With the increase of inlet pressure, the internal flow velocity of the channel also increases continuously, and the activity of the outlet fluid also gradually increases.
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Received: 11 June 2018
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