跌坎型底流消能工跌坎深度在工程优化设计中的应用

发布时间：2018-08-29 10:17

【摘要】：以某工程导流泄洪隧洞底流消能工为试验研究对象,原方案试验中,在闸门半开工况下,下泄水流出现脱离泄槽底板现象,不利于下泄水流的消能,经研究,改变压坡段底板坡度,同时将泄槽的两个坡段改成一个坡段;原方案底流消能工消力池内均发生远驱式水跃,消能效果差,通过研究采用以最大临底流速为控制目标的最小跌坎深度计算公式,确定消力池底板高程。经两次优化试验后,消除了闸后水流脱离泄槽底板的现象,下泄水流流态稳定,消力池内形成稳定的淹没水跃消能,出池水流与下游水流衔接较好,消力池内临底流速和时均动水压强均明显降低,消能效果好。
[Abstract]:Taking the energy dissipator at the bottom of the diversion tunnel of a project as the experimental research object, in the original scheme test, under the condition of half opening of the gate, the phenomenon of disengaging from the bottom of the drain slot appears in the downflow flow, which is not conducive to the energy dissipation of the discharge flow. Changing the slope of the bottom plate of the pressure slope section, and changing the two sections of the drain slot into one slope section, the original scheme of the bottom flow energy dissipator energy dissipation pool occurred in the far drive type hydraulic jump, the energy dissipation effect is poor, In this paper, the calculation formula of the minimum floor depth with the maximum critical velocity as the control target is used to determine the height of the bottom plate of the stilling pool. After two optimization tests, the phenomenon of the flow behind the sluice is removed from the bottom of the drain slot, the flow state of the discharge is stable, the steady submerged water jump energy dissipation is formed in the stilling pool, and the flow out of the tank is better connected with the downstream flow. The near bottom velocity and the time average dynamic pressure in the stilling pool are obviously reduced, and the energy dissipation effect is good.
【作者单位】：昆明理工大学电力工程学院;楚雄欣源水利电力勘察设计有限责任公司;
【基金】：国家自然科学基金(51169008)~~
【分类号】：TV653

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