Abstract
Based on the principle of the critical flow and standard k-ε three-dimensional turbulence model, experiments and simulations were performed on a portable pillar-shaped flume with three contraction ratios under 12 working conditions. By combining the numerical simulations with the experiments, the theoretical stage-discharge formula of the portable pillar-shaped flume was developed, and the variations in the Froude number, backwater height, critical submergence, head loss, and velocity distribution were examined. The simulation data obtained from the standard k-ε three-dimensional turbulence model are in good agreement with the experimental results, with a maximum error of 8.65%. The maximum error in the difference between the theoretical stage-discharge formula and the measured value is 4.74%. The upstream Froude number is less than 0.5, and critical submergence is between 0.73 and 0.96. Compared to airfoil pillar-shaped flumes, the portable pillar-shaped flume had a significantly smaller head loss and backwater height. Finally, the portable pillar-shaped flume can be used for flow measurement and has the advantages of high measurement accuracy, low backwater height, and small head loss.
Highlights
Rectangular channels, as an indispensable infrastructure in economic development, deal with the transportation of water resources, irrigation, water pollution control, flood prevention, storm drainage, and other important functions
There are various methods for measuring the flow of open channels, flow measurement based on the concept of critical flow is the most widely used technique, and flumes with a local contraction of channel are universally applied as discharge measurement structures, especially in scientific and hydrological research in irrigation systems [4,5,6]
Unlike a Parshall flume, an improved venturi channel which had a contraction along the channel axis rather than its side walls was proposed by Hager [17], central baffle flume was proposed by Kolavani et al and Bijankhan and Ferro, and the stage-discharge curve of the central baffle flume was studied experimentally [18, 19]
Summary
Rectangular channels, as an indispensable infrastructure in economic development, deal with the transportation of water resources, irrigation, water pollution control, flood prevention, storm drainage, and other important functions. It is widely used in the construction of water conservancy, especially in areas where the cultivated land resources are scarce or the efficiency of the cultivated land resources is high. In order to further study the internal flow field distribution and to provide a theoretical basis for the optimization and promotion of the portable pillar-shaped flume, its hydraulic characteristics are analyzed by means of computational fluid dynamics (CFD) using Fluent 19.2 software, which can accurately and conveniently compute and visualize the results
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