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四面六边透水框架是一种新型的防冲促淤结构,一般是由6根相同的杆件相互搭接而成的透空正四面体.采用平面二维粒子图像测速仪(PIV)对四面六边透水框架“迎流布置”和“背流布置”两种典型布置方式下的框架周边流场分别进行了测量,采用240个瞬时流场计算得到了水流时均和紊动流场特性,并与无框架作用下的流场进行了对比.结果表明,框架的存在对水流产生了较大干扰,水流结构发生明显改变;通过分析典型截面上框架后方的流速、紊动强度、雷诺应力及总切应力垂向分布和减速率,揭示了透水框架的防冲促淤机理,并对比了两种布置形式的减速效果,认为背流布置比迎流布置减速效果更好.
Four-sided six-sided water-permeable frame is a new type of anti-scouring and silting structure, and is usually a transparent tetrahedron made of six identical rods.The planar two-dimensional particle image velocimetry (PIV) The flow fields around the frame with six pervious frames, the “on-stream arrangement” and the “back-flow arrangement” were respectively measured. The average and turbulence The results show that the existence of the frame interferes with the water flow and the structure of the water flow changes obviously. By analyzing the flow velocity and the turbulence intensity behind the frame on the typical cross section, , Reynolds stress and total shear stress vertical distribution and deceleration rate, reveals the percolation mechanism scouring and silting mechanism, and compared the two types of arrangement of the deceleration effect, that the backflow arrangement than the Yingliu layout deceleration effect is better.