Experimental study on hydraulic characteristics of rectangular open channels under different boundary conditions
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Abstract:
In order to investigate hydraulic characteristics of open channel flow, based on indoor experiments, rectangle open channel with different slope rates were used, and the conditions of the side walls, slope angle and flux were changed to obtain experiment data. The experimental results showed that: under the same condition, the water depth increased linearly with the increase of flow rate, and the average flow velocity and the Reynolds number increased with the increase of the flow rate. The Froude number increased with the increase of the flow rate when Fr＜1. With the increase of the flow rate, the Froude number increased and then decreased when 1＜Fr＜1.526，and decreased gradually when Fr＞1.526. The Manning roughness coefficient decreased with the increase of flow rate. In the case of the same condition and the same flow rate, with the increase of slope, the water depth decreased, and the average flow velocity, Reynolds number，Froude number and Manning roughness coefficient increased. The empirical formula of Reynolds number and gradient and flow rate was obtained by the experimental data.
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