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对于长距离泄水槽,坡度缓水头高,常规设计消能工规模大,为此在底板上设置台阶,增加糙率,以减小消能工的规模。应用近似糙率法、CHANSON经验公式法对某长距离台阶式泄水槽进行了水力计算。计算结果符合经验规律,经工程实际运行验证2种计算方法均可应用于工程设计;台阶式泄水槽减速掺气消能效果显著,减少了工程投资。
For the long-distance drain tank, the slope is gentle on the water head, and the conventional design of the energy dissipater has a large scale. Therefore, a step is provided on the floor plate to increase the roughness, so as to reduce the energy dissipater size. Applying approximate roughness method and CHANSON empirical formula method, hydraulic calculation is carried out on a long-distance stepped drain tank. The calculation results accorded with the rule of experience. Two kinds of calculation methods verified by the actual operation of the project can be applied to the engineering design. The effect of decelerating aeration and aeration on the stepped scuppers is significant and the project investment is reduced.