Three groups of cubic roughness elements non-protruding to the flow were fixed with a specific configuration at the downstream of a stream lined lib sluice gate. The aim was to test the performance of the hydraulic jump under using such elements as appurtenances of stilling basin. The experimental works has been conducting to test; four different intensities, I=8%, 10%, 12% and 16%; three width to height ratios, We/he=0.75, 1.5 and 2; and three length to height ratios, Le/he=0.75, 2 and 4, of cubic elements made from waterproof stiff rubber. The test was performed under the incoming Froude number; F1 ranged between 2.7 to 9. After analysing the experimental data one from the second group configuration gives a higher reduction of sequent depth ratio, y2/y1 as compared with the depth ratio of the un-forced hydraulic jump which calculated by Belanger equation, this decreases arrived 20%. Also greater relative energy has been dissipated, and the gain in dissipation (%GED) ranged between 10.8-22.3%.
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机译:在特定的配置下,将三组不突出于流体的立方粗糙度元件固定在流线型lib闸门的下游。目的是在使用诸如消沉盆附属物的情况下测试水力跳跃的性能。实验工作一直在进行测试;四个不同的强度,I = 8%,10%,12%和16%;三个宽高比,We / he = 0.75、1.5和2;由防水硬质橡胶制成的立方元件的三个长高比Le / he = 0.75、2和4。测试是在输入的Froude编号下进行的; F1介于2.7到9之间。分析第二组配置中的一个实验数据后,相继的深度比y2 / y1的降低比通过Belanger方程计算的无力水力跳跃的深度比更高。减少到达20%。还消散了较大的相对能量,并且消散增益(%GED)在10.8-22.3%之间。
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