| HYDRAULIC ENGINEERING |
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Numerical simulation of the hydraulic characteristics of hilly irrigation systems |
| LIU Jiahong1, ZHOU Jinjun1,2, WANG Hao1,3, LV Hongxing2 |
1. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China;
2. College of Water Resources and Architectural Engineering, Northwest Agriculture and Forestry University, Yangling 712100, China;
3. Research Center for Water Resources and Hydro-ecological Engineering, Ministry of Water Resources, Beijing 100044, China |
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Abstract The hydraulic characteristics of pressurized pipelines are important for irrigation system designs. The hydrodynamics irrigation pipes in a hilly terrain were analyzed here using a computational fluid dynamics model. The energy losses in the pipeline were calculated with the input discharge as the control variable. The relationship between the Reynolds number and flow resistance coefficient of a convex section (a 135° elbow) was analyzed. The pressure and velocity distributions are presented for the pipeline. The results show that:1) when the Reynolds number is less than 5.0×104, the flow coefficient of the elbow decreases rapidly with increasing Reynolds number; 2) when the Reynolds number is more than 7.0×104, the flow coefficient is nearly constant; 3) when the Reynolds number is in the range of 2.3×104 and 7.0×104, the flow coefficient ranges in 4.12~0.37. The pressure on the backside of the elbow is high, while the inside pressure is low. The velocity distribution is just the opposite with a low velocity near the backside of the elbow and higher velocities near the inside.
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| Keywords
hilly irrigation systems
flow coefficient
Reynolds number
computational fluid dynamics
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Issue Date: 15 April 2016
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2016,
Vol. 56
