与X型宽尾墩联合的台阶面近底水流特性研究  

Study on Underflow Hydraulic Characteristics of Step Surface with X-Shape Flaring Gate Pier

作　　者：杨钊 尹进步[1] 张曙光 卢洋亮 赵东阳 YANG Zhao;YIN Jinbu;ZHANG Shuguang;LU Yangliang;ZHAO Dongyang(College of Water Resources and Architectural Engineering,Northwest Agricultural and Forestry University,Yangling 712100,China)

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨凌712100

出　　处：《人民黄河》2021年第9期150-155,共6页Yellow River

摘　　要：通过数值模拟对与X型宽尾墩联合的台阶溢洪道近底水流水力特性进行了研究,并根据实测资料对其结果进行验证,最后结合滑移流流速分布、压强分布以及台阶内水平面与竖直面的压强分布,对近底水流流态进行分析。结果表明:台阶溢洪道滑移流流态下,旋滚区与主流区之间存在过渡区;过渡区下边界为旋滚水流分离点与交汇点的连线,上边界为断面压强分布极大值点连线;沿水流方向,过渡区内流速波动强烈,远离台阶面时波动减弱,至上边界波动消失。台阶铅直面相对高度y/h=0.83~0.91处出现负压,随后向下流动的水流与旋滚区沿铅直面向上流动的水流交汇,形成铅直面y/h=0.56~0.70处压强较大现象。The stepped spillway with X-shape flaring gate pier was studied by numerical simulation. The velocity distribution, pressure distribution and the pressure distribution of the horizontal surface and the vertical surface in the step with different discharges were obtained, and the feasibility of the results was verified by the measured data. The flow regime of the underflow was analyzed by the obtained results. The results indicate that stepped spillway skimming flow has transitional region witch between the mainstream region and the rolling region and the velocity and pressure of transitional region along the direction increase at the same time. There are separation points and intersection points in the water flow inside the steps, and the maximal pressure will be generated at both separation points and intersection points, so that the pressure in the horizontal surface and vertical surface of the steps will be distributed in a wave pattern. Negative pressure occurs at the vertical surface of the step y/h=0.83 to 0.91, and then the downward flow of the water intersects with the upward flow, resulting in a larger pressure at y/h=0.56-0.70 on the vertical surface. Along the flow direction, the velocity fluctuates strongly in the transition region.

关 键 词：台阶溢洪道 数值模拟 滑移流 过渡区 

分 类 号：TV652.1[水利工程—水利水电工程]