摘要
在保证消力池容积不变的情况下,采用水工模型试验和标准κ-ε紊流数学模型相结合的方法,对不同尾坎纵向坡度的消力池进行了模型试验和数值模拟,研究了消力池尾坎坡度(90°、75°、60°、45°)对消力池内水流流动特性和消能率的影响,并将计算结果与水工模型试验结果进行对比验证。结果表明,数值计算结果与模型试验吻合较好,所采用的数值模拟方法可行;在保证消力池容积不变的情况下,尾坎坡度越大,消能效果越好,临底流速越小;但尾坎纵坡越大,消力池内水深增加,底板压强越大,边墙设计中应予以考虑。因此,在实际工程中应合理设计尾坎坡度,兼顾消能效果和两侧边墙高度要求。
Numerical simulation and model test were carried out to study hydraulic characteristics and energy dissipation efficiency of stilling basin with different end slopes(90°,75°,60°,45°)under the same condition of stilling basin volume.The simulation based standardκ-εturbulence model was compared with the hydraulic model tests.It shows that the simulation results are consistent with the model tests and the selected numerical simulation is feasible.With the same volume of stilling basin,when the end slope is steeper,the energy dissipation efficiency is higher and the bottom velocity is smaller.However,the water is deeper in the stilling basin,and the pressure on the stilling basin floor is bigger.Therefore,the optimal angle of end slope,energy dissipation efficiency,and the height of side wall should be taken into consideration at the same time in the related projects.
出处
《水电能源科学》
北大核心
2017年第5期104-107,共4页
Water Resources and Power
基金
国家自然科学基金项目(51679157)
关键词
数值计算
κ-ε模型
消力池
尾坎坡度
消能率
numerical simulation
κ-εmodel
stilling basin
end slope
energy dissipation efficiency
