首页|圆紊形墩台尾迹水动力特性开缝控制三维数值分析

圆紊形墩台尾迹水动力特性开缝控制三维数值分析

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水流绕流水闸闸墩、导流墩等水工建筑物后产生旋涡分离流,其三维尾迹结构水动力特性复杂,对旋涡分离流进行流动控制,不仅是闸墩优化设计的需要,而且关系到工程运行的效率和工程安全.在验证三维水动力数学模型的基础上,对圆紊形墩台开缝后的旋涡分离流和流动控制的三维水动力特性进行了研究,对比了无缝与开缝墩台方案下纵向、横向和竖向方向的时均流速分布,湍流动能以及湍流强度分布等水力学指标,探究了开缝墩台水动力特性.分析表明,墩台开缝后可以明显改善墩台后方的水流结构,开缝位置越靠近水深的中部位置,对墩后尾流旋涡的抑制越大,对绕流墩台绕流的控制越来越好,水深中部位置开缝最大程度的影响了开缝墩后的上部水流和下部水流,使得开缝对时均流速的影响最大,开缝对旋涡的抑制也最大最佳.为抑制墩后的旋涡对工程的不利影响,工程的设计中应首先确定墩台后的水深,开缝位置应尽量设置在墩台后水深的中部位置.
Three dimensional numerical analysis of hydrodynamic characteristics of circular pier and abutment wake with slit control
Water flows around hydraulic structures such as gate piers and diversion piers,it results in vortex sepa-rated flow.The three-dimensional wake structure has complex hydrodynamic characteristics,and flow control of vortex separated flow is not only necessary for the optimization design of gate piers,but also related to the efficiency and safety of engineering operation.On the basis of verifying the three-dimensional hydrodynamic mathematical model,this article studies the three-dimensional hydrodynamic characteristics of vortex separation flow and flow control after the circular end pier is slotted.It compares the time-averaged velocity distribution,turbulent flow en-ergy,and turbulence intensity distribution in the longitudinal,transverse,and vertical directions under the seam-less and slotted pier schemes,and explores the hydrodynamic characteristics of the slotted pier.Analysis shows that the water flow structure behind the pier can be significantly improved after the opening of the pier.The closer the opening position is to the middle of the water depth,the greater the suppression of the wake vortex behind the pier,and the better the control of the flow around the pier.The opening of the middle position of the water depth greatly affects the upper and lower water flow behind the slotted pier,making the opening the most influential on the time-averaged flow velocity,and the opening also has the greatest and best suppression on the vortex.To sup-press the adverse effects of vortices behind the piers on the project,the water depth behind the piers and abutments should be determined first in the design of the project,and the opening position should be set as much as possible in the middle of the water depth behind the piers and abutments.

round end pier and abutmentfluid flow slit controlturbulent kinetic energyvortex separation flowthree dimensional numerical analysis

李东风、白福青、方志浩、张红武、胡建永

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浙江省农村水利水电资源配置与调控关键技术重点实验室,浙江水利水电学院,浙江杭州 310018

浙江海洋大学船舶与海运学院,浙江舟山 316022

清华大学水沙科学与水利水电工程国家重点实验室,北京 100084

浙江海洋大学海洋工程与装备学院,浙江舟山 316022

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圆紊形墩台 开缝流动控制 湍流动能 旋涡分离流 三维数值模拟

浙江省自然科学基金项目浙江省自然科学基金项目国家重点研发计划项目国家重点研发计划项目农村水利水电资源配置与调控关键技术浙江省重点实验室项目校科研项目

LZJWZ22C030001LZJWZ22E0900042016YFC04025022016YFC0402500ZJWEU-RWM-202101XKY2023012

2024

10.13243/j.cnki.slxb.20230604

水利学报
中国水利学会

水利学报

CSTPCD北大核心
影响因子：1.778
ISSN：0559-9350
年,卷(期)：2024.55(6)