连续跌坎型底流消能工水力特性的影响因素研究

通过大量的试验,测量了消力池底板压强分布规律、池内流态和流速分布,着重分析了入池水流单位重量水体能量、入池角度和跌坎高度的变化对消力池底板冲击压力、临底流速、池内流态及消能率的影响。研究表明,连续跌坎型底流消能工的跌坎高度与入池角度之间存在一种最优组合,可既保证消力池中消能率高,又能满足临底流速和底板动水冲击压力小的要求。该研究成果可为工程设计提供一定的科学依据。

Hydraulics Characteristics of Continuous Step-down Energy Dissipation

Based on the plenty of model experiments,the distribution of hydrodynamic pressure on the stilling basin,flow velocity and flow pattern in the basin are measured.The study focuses on these factors such as the different flow energy entranced the basin,the slope of flute connecting the stilling basin,the height of the drop step,which greatly influences the flow impact pressure on the basin floor,the flow velocity near the floor,the flow pattern and the energy dissipation rate.The results show that there exists an optimal combination of step height and the slope of flute connecting the stilling basin.With this optimal combination,both higher energy dissipation rate and lower flow velocity near the floor and lower hydrodynamic pressure on the floor in the basin can be obtained,which may be useful for the engineering design.