[1]ZHONG Xinming,MA Xiaoyi,YANG Peipei.Numerical Simulation on Discharge Relation of Arc-Based Trapezoidal Canal and Cut-throat Flow Measurement Flume[J].Research of Soil and Water Conservation,2016,23(02):340-345.
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
23
Number of periods:
2016 02
Page number:
340-345
Column:
Public date:
2016-04-28
- Title:
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Numerical Simulation on Discharge Relation of Arc-Based Trapezoidal Canal and Cut-throat Flow Measurement Flume
- Author(s):
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ZHONG Xinming, MA Xiaoyi, YANG Peipei
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College of Water Resources and Architectural Engineering, Northwest A & F University, Yang ling, Shaanxi 712100, China
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- Keywords:
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water-saving irrigation; flow measurement flume; numerical simulation; channel bottom slope
- CLC:
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TV135.3
- DOI:
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- Abstract:
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To adapt to the irrigation management methods and section form of most channels, developing new facilities plays a vital role in water-saving irrigation. According to finite volume method, RNG k-ε turbulence model and VOF model, we make the amount of three-dimensional numerical simulation experimental study on arc-based trapezoidal cut-throat flow measurement flume by Fluent 6.3. By comparing the simulation results with the theoretical value, the result is well matched. This proofs that the fluent software for numerical simulation methods of free surface turbulence characteristics is reliable. On this basis, we carry out the amount of comprehensive simulation experimental Study on water level and discharge in different open channel bottom slopes. The results show that: (1) the upstream of the flow measurement flume is slow steady stream and the internal flow is jet stream, so the critical flow is bound to happen, Froude numbers along the flow measurement flume show that the critical flow can generate near the diffusing section of the throat; (2) the relationship between upstream water level and discharge is significant, the contraction ratio and bottom slope have great impact on forming the stable relationship between water level and discharge, the contraction ratio decreases with the increases of ε, channel size R, H, flow measurement flumes gradually form the unified water level and discharge relationship in the larger scope of the bottom slope; (3) the results have shown that the flow coefficient has a linear relationship with flume width and contraction ratio, and the flow coefficient increases with an increases of R, H and ε. The flow equations established by regression analysis show the average error value formula for measuring flow within 5%, which explains that arc-based trapezoidal canal and cut-throat flow measurement flume meets the requirements of open channel flow measurement. The results will provide some references and recommendations for the application of the irrigation branch canals.