摘要
采用RNG k-ε三维紊流数学模型对180°强弯弯道水流结构和温度场进行模拟,对比分析了矩形断面和复式断面结构形成的二次流场特征及其对温度扩散的影响。结果表明:在强弯弯道中,离心力作用决定了主要环流(螺旋流)的方向;复式断面结构加大了滩槽处大量的动量交换和能量交换,使断面温度分布更趋于均匀。
The RNG（renormalization group methods） based turbulence model is used to simulate the flow and heat diffusion in 180° curved open channel. Both rectangular and compound channel flow in section are simulated to study the influence of the secondary flow on the heat mixing in curved open channel. The result shows that the centrifugal force decide the direction of the helical flow in curve channel. The compound channel structure enhances the exchange of the momentum and energy between bank and main channel, which causes strong mixing of the heat.
基金
国家自然科学基金资助项目(50749031
51079105)
关键词
弯道流
温排水
二次流
复式断面明渠
bend flow
heated water
secondary flow
compound open channel
