60°弯道丁坝水流水力特性数值模拟研究  

Hydraulic characteristics of straight and T-shape spur dikes in 60° channel bend by numerical simulation

作　　者：魏文礼[1] 郭扬扬 张泽伟[1] 刘玉玲[1] 李东旭[1] 

机构地区：[1]西安理工大学陕西省西北旱区生态水利工程重点实验室,西安710048

出　　处：《水力发电学报》2017年第9期91-99,共9页Journal of Hydroelectric Engineering

基　　金：陕西省工业科技攻关项目(2016GY-180);陕西省科学研究计划项目(2014K15-03-05);国家自然科学基金(51578452;51178391)

摘　　要：采用气液两相流模型结合RNG k-ε紊流模型(FLUENT 6.3)对60°弯道内布设丁坝时的水力特性进行了数值模拟,自由液面的捕捉采用VOF(Volume of Fluid)法,速度与压力的耦合方程组利用半隐式SIMPLE(Semiimplicit Method for Pressure-linked Equations)算法求解,控制方程采用有限体积法离散。将弯道内布设直丁坝时流速和水位的模拟结果与试验数据进行了比较,两者吻合较好。随后用该模型研究了T型丁坝对弯道水力特性的影响并与直丁坝进行了比较,结果表明:T型丁坝在调整水面横比降、减小坝后回流区长度、改善弯道水流流态等方面较直丁坝有明显优势。Three-dimensional hydraulic characteristics of spur dikes in a 60° channel bend were simulated numerically using a gas-liquid two-phase flow model and an RNG k-ε turbulence model（FLUENT 6.3）, along with the VOF method for free surface tracking and the SIMPLE algorithm for solving the governing equations on a finite-volume discretization framework. Calculated distributions of velocity and water level in the bend show a good agreement with previous experimental data. This two-phase flow model was applied to simulations of the flows around a set of three T-shape spur dikes located at the concave side of a 60° channel bend. Comparison with straight spur dikes indicates that the T-shape spur dikes have advantages in reducing transverse surface slope, improving flow patterns, and suppressing flow circulations behind the spur dikes.

关 键 词：弯道水流 丁坝 水面横比降 流态 数值模拟 

分 类 号：X131.2[环境科学与工程—环境科学]