摘要
泄洪防冲消能设计是水利工程设计中的重要技术问题。采用水工模型试验和数值模拟相结合的方法对连续坎和燕尾坎的水力特性进行了对比。主要研究内容包括两种挑坎的水舌运动特性、水垫塘底板动水压强分布及其扩散特性、RNG k-ε湍流模型求解脉动荷载的可行性。研究结果表明:RNG k-ε湍流模型对于连续坎和燕尾坎的水舌形态、水垫塘底板时均压强、不同工况下水垫塘底板脉动均方根的变化规律均可达到较高的模拟精度;相比于连续坎,燕尾坎对于水舌的纵向拉伸效果明显,水垫塘冲击区范围扩大,底板上的时均压强与脉动压强均方根峰值均向上游移动且大幅度减小,荷载集中程度减弱。
Energy dissipation is a critical issue in the design and operation of water conservancy projects.The hydraulic characteristics of conventional flip buckets and partial-flip buckets were compared using the integrated method of hydraulic model test and numerical simulation.Some essential factors were compared and analyzed such as:movement characteristics of trajectory jets from the two types of flip buckets;distribution of dynamic pressure load on the plunge pool floor slab and its diffusion characteristics,feasibility study of RNG k-εturbulence model to the solution of pulsating loads.The results show that the RNG k-εturbulence model can achieve accurate simulation results for the movement characteristics of trajectory jets from flip buckets and partial-flip buckets,time-average pressure on the plunge pool floor slab and variations of the pulsating pressure root mean square on the plunge pool floor slab under different working conditions.Compared with the conventional flip buckets,partial-flip buckets led to a larger longitudinal stretch of trajectory jets and expansion of the impact zone in the plunge pool.Correspondingly,the peak of time-average pressure and root mean square of the pulsating pressure on the plunge pool floor slab shifted upstream and reduced significantly,which is all conducive to more energy dissipation.
作者
马斌
叶星宇
缑文娟
王孝群
王宇航
MA Bin;YE Xingyu;GOU Wenjuan;WANG Xiaoqun;WANG Yuhang(State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300350,China;School of Water Conservancy and Hydroelectric Power,Hebei University of Engineering,Handan 056038,China;Hebei Key Laboratory of Intelligent Water Conservancy,Hebei University of Engineering,Handan 056038,China)
出处
《水资源与水工程学报》
CSCD
北大核心
2021年第6期125-133,共9页
Journal of Water Resources and Water Engineering
基金
国家重点研发计划项目(2016YFC0401707)
国家自然科学基金项目(51779167、51809194)。
关键词
挑流消能
模型试验
燕尾坎
水垫塘
RNG
k-ε模型
ski-jump energy dissipation
hydraulic model test
partial-flip bucket
plunge pool
RNG k-εmodel