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| Numerical simulation of flow field characteristics of inclined tube-gravity sedimentation tank for drip irrigation in Yellow River |
| WANG Keyuan, LI Yunkai, YANG Peiling*, REN Shumei |
| College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China |
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Abstract The sedimentation tank is the key facility to ensure the safe operation of drip irrigation system in Hetao irrigation areas. It is of great significance to study the flow field characteristics for optimizing the structure of the sedimentation tank and improving the sediment deposition efficiency. A new type of gravity settling basin for Yellow River irrigation areas was studied. It reduced the sediment settling distance by setting the inclined pipe in the sedimentation tank, and further improving the sedimentation efficiency. Based on the numerical simulation technology, the Realizable k-ε model in Star-ccm+software was used to simulate the flow process of the inclined tube-gravity sedimentation tank which was used in Hetao irrigation areas. The numerical simulation results were in good agreement with the measured data, which showed that the numerical simulation results could well reflect the flow field characteristics of the inclined tube-gravity sedimentation tank. The simulation results showed that the flow pattern in the inclined tube area of the settling basin was relatively stable, which was favorable for stable settling of the sediment. The vortex area at the front of the sedimentation tank and the bottom of the front area and the top of the back area of inclined tube area was not conducive to sediment settlement. The water absorption effect of the overflow weir in the back of the sedimentation tank affected the flow stability in the inclined tube area and reduced the sedimentation efficiency. Therefore, it is necessary to further optimize the structural parameters of the sedimentation tank. The research indicates that this type of settling basin needs to optimize the hole arrangement pattern of the adjusting flow board, the assembly height of the inclined tube and the position of the overflow weir.
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Received: 01 May 2018
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