滩地植被化明渠中横向水平射流特性试验研究

运用Micro ADV测速系统,对3种工况下滩地植被化的复式断面横流环境中三维圆形水平射流的特性进行了试验研究.试验测得的射流典型横断面速度场及湍动能的成果表明,射流与来流的相互作用表现出明显的分叉现象,其分叉半角为5.71°;复式断面二次流具有加速射流分叉的作用,滩地植被具有减缓射流分叉的效应.对射流出口平面的速度场及湍动能的分析表明,射流轨迹曲线的弯曲程度、射流中心线的位置主要取决于射流与来流流速比.流动横断面流速和湍动能特性表明,射流在整个流场中是各向异性的.

Experimental study on the behavior of horizontal turbulent side jets in compound open channel with vegetated plain

The Micro ADV is used to test the round jets in the cross flow in the unsymmetrical compound channel with vege tated plain for the 3 typical cross sections.The measured velocity fields show that the interact ion between the jets and the cross flow results in bifurcation,which is enlarged by the secondary flow and allayed by vegetation.The half angle of the bifurcation is 5.71°.The velocity and the turbulent kinetic energy of the jet exit plane with different jet-to-cross velocity ratios are obtained.It is found that the jets are anisotropic in the whole flow field.The curvature of the jet curve and the jet center lines's location mainly depend on the jet to cross velocity ratios.The data can be used to validate the turbulent model and the numerical methods.