摘要
在垂直跌水池的水槽试验中,在一定的水力条件与跌水池尺寸相匹配时,跌水池内会形成舌流、滑行水流与周期性振荡流。针对实验观察的现象,采用数值模拟以及理论分析着重研究了跌水池中周期性振荡流的流动演变特性与消能机理,并初步探讨了周期性振荡流的产生机理。研究分析表明,该周期性振荡流的流态呈现有波破碎与水跃的形态,据此可将跌水池分为回流区、水平冲击区、垂直冲击区、表面振荡破碎区以及尾部漩涡区。由于流体的惯性与结构物对水流的反射作用扰动了原流场自由液面,在波和涡的相互作用下形成了周期性振荡流。
It was discovered that in flume experiment, under certain conditions, the dropping flow forms napped flow, skimming flow and periodic oscillation flow. Based on the numerical simulation,flume experiment and theoretical analysis, this paper focuses on studying the energy dissipation mechanism,flow evolution characteristics and generating mechanism of periodic oscillatory flow. The results show that the flow pattern of periodic oscillation flow presents a similar wave of broken and hydraulic jump. The vertical drop pool is divided into recirculation region,level of impact zone,the vertical impact zone,oscillation and broken zone and the tail vortex zone. Since fluid inertia and the reflection effect of structure disturb the original free surface,the periodic oscillation flow forms under the wave-mean vortex interaction.
出处
《水利学报》
EI
CSCD
北大核心
2014年第11期1373-1380,共8页
Journal of Hydraulic Engineering
基金
四川省学术和技术带头人培养资金资助(2012DTPY020)
关键词
垂直跌水池
周期性振荡流
数值模拟
消能机理
波涡相互作用
vertical drop pool
periodic oscillation flow
numerical simulation
energy dissipation mecha-nism
wave-mean vortex interaction
