CAJ | 학술논문

由于台阶式溢洪道结构特殊，流态复杂，对台阶式溢洪道压强并未取得一致性的研究成果。对多个台阶式溢洪道滑掠流时均压强资料进行分析，探讨来流流量、掺气、台阶尺寸、溢洪道坡度等对台阶式溢洪道时均压强的影响。分析结果表明：单宽流量大，时均压强变大；掺气可有效降低正压时均压力并增加负压值；台阶尺寸对台阶式溢洪道的影响较为复杂，台阶尺寸较小，且坡度较缓时竖直面压强呈中间小、两头大分布，坡度较大时具有2个压力极小值，位于竖直面底部和顶部，台阶尺寸较大时竖直面压强自下而上呈减小趋势；坡度增加，台阶式溢洪道压强变化幅度增大。
유우태계식일홍도결구특수，류태복잡，대태계식일홍도압강병미취득일치성적연구성과。대다개태계식일홍도활략류시균압강자료진행분석，탐토래류류량、참기、태계척촌、일홍도파도등대태계식일홍도시균압강적영향。분석결과표명：단관류량대，시균압강변대；참기가유효강저정압시균압력병증가부압치；태계척촌대태계식일홍도적영향교위복잡，태계척촌교소，차파도교완시수직면압강정중간소、량두대분포，파도교대시구유2개압력겁소치，위우수직면저부화정부，태계척촌교대시수직면압강자하이상정감소추세；파도증가，태계식일홍도압강변화폭도증대。
As stepped spillway has special structure and complex flow patterns,researches on the pressure in stepped spillway are not consistent.In view of this,we investigate into the effects of flow discharge,air entrain-ment,step size and spillway’s slope gradient on the distribution of time-averaged pressure through analysing the pressure data of skimming flow in several stepped spillways.Results reveal that big discharge per unit width leads to big time-averaged pressure.Air entrainment could effectively reduce positive time-averaged pressure and increase negative pressure.Effect of the step size is complicated:when the step size is small with gentle slope,pressure is small in the middle but large on both ends in vertical plane of the step;when step size is small with steep slope, minimum pressure occurs on the bottom and top of step in vertical plane;while when the step size is large,pressure decreases from the bottom to the top,and pressure variation intensifies with the increase of slope gradient.