根据河湾迎流顶冲位置和河床冲深，确定护岸范围和优选护岸护底方案。
Based on the scouring position and depth by current in river bend the scope of bank protection and better selection scheme of bank protection are determined.
所有的空气动力都必须在缺乏任何迎流的情况下产生，意味着只可能通过翼的有动力作用的往复运动来产生提升。
All of the aerodynamic force must be produced in the absence of any incident flow, meaning lift can only be produced by the powered reciprocating motion of the wing.
实验观察到射流迎、背流剪切涡层卷起形成类开尔文涡列。
A kind of Kelvin type vortex formed by the roll up of the jet shear layer is observed in the experiment.
实验观察到射流迎、背流剪切涡层卷起形成类开尔文涡列。
A kind of Kelvin type vortex formed by the roll up of the jet shear layer is observed in the experiment.
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