【摘要】 掺气跌坎是明流泄洪洞强迫掺气的常用设计形式,本文根据前人研究成果,通过理论分析与模型试验相结合的方法,研究了掺气坎后水舌冲击力与空腔回水问题。对抛物线型底板,通过分析和比较,得出采用截断抛物线型底板,在高、中、低库水位泄流条件下增加了水舌冲击点范围的底坡,降低了高速水流水舌对底板的冲击夹角,减轻了对底板的冲击力,改善了空腔回水问题,并对实际工程设计提供了参考及指导。更多还原

【Abstract】 Aerators have been widely used in free flow spillway tunnels.Based on previous results,the impulsive force caused by flow nappe rushing to tunnel bottom and the backwater in the cavity were studied theoretically and experimentally in this paper.By analysis and comparison among different trajectory bottoms,it is shown that under different reservoir water level conditions,when a truncated trajectory bottom is applied,the bottom slope at the intersection of flow nappe with tunnel bottom is greater and the intersection angle of the flow nappe with the bottom is reduced.This causes a decrease in the impulsive force and an improvement on the backwater.These results can be referenced in bottom aerator design.更多还原