摘要
为深入了解封闭梯形渠道的水流特性,以3m长封闭梯形渠道为例,采用雷诺应力紊流模型对不同糙率顶板的封闭梯形渠道水流特性进行了数值模拟,分析了影响其流速场和二次流形态的因素。结果表明,断面流速呈非对称的弓形分布,随顶板糙率的加大,最大流速点向渠底移动;由于受边壁和顶板糙率的影响,过水断面的二次涡流主要集中在固壁拐角处;壁面附近的紊动强度和紊动能耗散量均比较大;粗糙顶板的壁面剪切应力大于光滑顶板的切应力。
An enclosed trapezoidal channel of three-meter length with different roofs was taking as an example to better understand its flow characteristics.Reynolds stress turbulence model was chosen to simulate the inside flow structures.We analyzed the factors for influencing its velocity field and secondary flow patterns.The results show that the velocity of the flow section is unsymmetrical arch;maximum velocity points move towards the channel＇s bottom with the increasing of roof＇s roughness;vortexes of the flow section influenced by the roughness of both roof and side walls are mainly concentrated around corners;both turbulent kinetic energy and turbulent dissipation rate are intensive near walls;wall shear on rough roof is larger than that on glass roof.
出处
《水电能源科学》
北大核心
2015年第1期81-83,6,共4页
Water Resources and Power
关键词
封闭梯形渠道
数值模拟
水流特性
二次流
漩涡
closed trapezoidal channel
numerical simulation
flow characteristics
secondary flows
vortex
