CAJ | 학술논문

为了探究高海拔地区台阶式溢洪道水力特性，对坝顶位于海拔2586．0 m，斜坡角度θ＝32°的某大坝台阶式溢洪道进行了模型试验。通过改变来流流量，研究了3种不同工况下溢洪道台阶竖直面及水平面时均压强、水面线、流速、脉动压强等水力特性。结果表明：在3种试验工况下，台阶式溢洪道不仅具有较高消能率，而且不会发生空化空蚀破坏；溢洪道竖直面及水平面压力沿程为跳跃式分布；水深及流速在台阶溢洪道上达到某一值后，基本稳定。该结果可为高海拔地区的台阶式溢洪道优化设计提供参考依据。
위료탐구고해발지구태계식일홍도수력특성，대패정위우해발2586．0 m，사파각도θ＝32°적모대패태계식일홍도진행료모형시험。통과개변래류류량，연구료3충불동공황하일홍도태계수직면급수평면시균압강、수면선、류속、맥동압강등수력특성。결과표명：재3충시험공황하，태계식일홍도불부구유교고소능솔，이차불회발생공화공식파배；일홍도수직면급수평면압력연정위도약식분포；수심급류속재태계일홍도상체도모일치후，기본은정。해결과가위고해발지구적태계식일홍도우화설계제공삼고의거。
To explore the hydraulic characteristics of stepped spillway at high altitude,we conducted model test on the stepped spillway of a dam with slope θ=32°and dam crest at elevation 2586.0 m.By changing the incoming flow rate,we compared the hydraulic characteristics (time-averaged pressure in vertical and horizontal planes,wa-ter surface profile,flow velocity,and fluctuation pressure)in different conditions.Results prove that in all the three conditions,the stepped spillway has high energy dissipation efficiency and no cavitation.Pressure on step ver-tical plane and horizontal plane distributes in a bouncing manner along the spillway,and the height of water surface and the flow velocity will keep stable after reaching a certain value.