Numerical simulation of the hydraulic characteristics of hilly irrigation systems

LIU Jiahong; ZHOU Jinjun; WANG Hao; LV Hongxing

doi:10.16511/j.cnki.qhdxxb.2016.24.008

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Journal of Tsinghua University(Science and Technology) ›› 2016, Vol. 56 ›› Issue (4) : 387-393. DOI: 10.16511/j.cnki.qhdxxb.2016.24.008

HYDRAULIC ENGINEERING

Numerical simulation of the hydraulic characteristics of hilly irrigation systems

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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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hilly irrigation systems / flow coefficient / Reynolds number / computational fluid dynamics

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LIU Jiahong, ZHOU Jinjun, WANG Hao, LV Hongxing. Numerical simulation of the hydraulic characteristics of hilly irrigation systems[J]. Journal of Tsinghua University(Science and Technology). 2016, 56(4): 387-393 https://doi.org/10.16511/j.cnki.qhdxxb.2016.24.008

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