多股射流入流间距对下游水力特性影响分析  

Study on impact from inflow space of multi-jet flows on downstream hydraulic characteristics

作　　者：王晓鹏[1] 范晏岗[1] 郑铁刚[2] 

机构地区：[1]新疆额尔齐斯河流域开发工程建设管理局,新疆乌鲁木齐830000 [2]中国水利水电科学研究院,北京100038

出　　处：《水利水电技术》2016年第4期52-57,共6页Water Resources and Hydropower Engineering

基　　金：国家自然科学基金(51309256)

摘　　要：基于RNG k-ε紊流模型和VOF自由表面追踪法,采用非均匀结构网格技术,建立了三维紊流数学模型,并对多股底流水跃进行了三维模拟,详细分析了入流间距对多股底流消能下游流态的影响规律,探讨了不同孔距比下消力池内的漩涡特性。研究结果表明:入流间距对单股主流两侧流态影响显著,当孔距比大于1.5时,有回流形成;当孔距比大于等于2.0时,在弗汝德数约为7.0条件下,下游消力池底板附近已形成不同强度的立轴漩涡,所得成果可为相似研究提供参考。Based on RNG k- ε turbulent model and VOF method,a 3- D mathematical model of turbulance is established with the technique of non-uniform structural grid,and then a 3- D accurate simulation is made on the multi-bottom flow jumps,thus the law of the impact from the inflow space on the downsream flow pattern of the the multi-bottom flow dissipation is analyzed in detail,while the vortex characteristics in the stilling pool under the conditions of various hole spacing ratio are discussed as well.The study result shows that： the impact from the inflow space on the flow patterns of both the sides of main single flow is significant; i. e. if the hole spacing ratio is larger than 1. 5,the backflow is to be formed and if the ratio is larger than or equal to 2. 0,the vertical vortexes with different intensities are formed near the bottom slab of the downsream stilling pool under the condition of the Froude number of about 7. 0,from which the achievements can provide some references for the similar studies concerned.

关 键 词：多股射流 底流消能 入流间距 流态 立轴漩涡 

分 类 号：TV131.22[水利工程—水力学及河流动力学]