摘要
针对过水围堰溢洪流场特征系统研究较缺乏,数值模拟分析较少的现状,通过制作过水围堰溢洪的专门水工试验装置,结合数值模拟开展系统的水力特性研究并对比分析水面线、流速分布及压力的试验值与数值计算值。结果表明,过水围堰溢洪最大流速出现在消能平台进口附近,前部流速分布表现为底层流速大、表层流速小;消能平台底板承受水流转向的冲击力,压力随泄流量增大而增大。消能平台承担消能防冲任务,水流特性对围堰结构稳定至关重要,研究成果可为改善消能平台结构设计提供依据。
At present, the systematic research and numerical simulation about hydraulic characteristic on overtopped cofferdam is deficient. So, the special hydraulic model of overtopped cofferdam was made and research of systemic hydraulic characteristic was carried out by physical model and numerical simulation. The experimental data and calculation of water surface curve, flow velocity distribution and pressure were compared. The results show that the maximum flow velocity of overflow on overtopped cofferdam occurs around the inlet of the energy dissipation platform. The flow velocity in bottom is larger than that in surface at the front of the energy dissipation platform. The impact force from water flow swerve is born by the baseplate of the energy dissipation platform, and the pressure rises as the discharge increases. The energy dissipation platform undertakes the energy dissipation and erosion protection task. The hydraulic characteristic is fatal to the structural stability of overtopped cofferdam. Research results can provide reference for improvement of structure design of the energy dissipation platform.
出处
《水电能源科学》
北大核心
2015年第9期99-101,98,共4页
Water Resources and Power
基金
国家自然科学基金项目(51109149
51209155
51309172)
关键词
过水围堰
消能平台
水力特性
模型试验
数值模拟
overflow cofferdam
energy dissipation platform
hydraulic characteristic
model test
numerical simulation
