摘要
根据紊流边界层理论,整理分析了前人对台阶式溢洪道掺气位置的研究成果,提出了掺气发生点的计算方法。通过模型试验,研究了坡度分别为30°、51.3°、60°台阶式溢洪道上掺气水深的分布规律。研究结果表明当台阶尺寸一定时,掺气水深主要与堰上流能比、台阶坡度、台阶以上总水头有关;流能比越小,单宽流量越小,台阶上的水层越薄,掺气越充分,相对掺气水深越大;随着坡度的变陡,来流速度增加,掺气发生点前移,水流破碎严重,水深增加越大;沿程相对掺气水深随流程的增加而增加。
According to the theory of turbulent boundary layer,and by analyzing the research achievements of predecessors on stepped spillway,the calculation method for the point of incipient aeration is proposed.The distribution rule of aerated flow is studied by experiment on stepped spillway within the range of 30°~ 60°.When the step size is constant,aerated flow depth is a function of discharge-energy ratio above the weir,step slope and total water head.The relative depth of aerated flow increases with smaller discharge-energy ratio and unit discharge,which means the thinner water layer on steps is,the more sufficient aeration will be.When the slope becomes steeper,the celocity increases,which will enhance the point of incipient aeration move forward and the flow seriously broken,so as to increase the flow depth,relative aerated flow depth along the flow direction increases also.
出处
《应用力学学报》
CAS
CSCD
北大核心
2011年第6期644-648,677,共5页
Chinese Journal of Applied Mechanics
关键词
台阶式溢洪道
掺气发生点
掺气水深
stepped spillway,the point of incipient aeration,aerated flow depth.
