Tandem submerged cylinders each subject to zero drag
Tandem submerged cylinders each subject to zero drag
复制标题
串联浸没式气缸均具有零阻力
DOI：
--
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发表时间：
1998
影响因子：
3.7
通讯作者：
D. Scullen
中科院分区：
文献类型：
--
作者：
E. Tuck;D. Scullen
两个相同的圆柱体一前一后地浸没在溪流中相同的深度。圆柱体中心之间存在间隔距离，使得组合体不产生下游波，因此受到零净波阻。一般来说，在每个圆柱体上有一个非零的、大小相等且方向相反的水平力。然而，存在特殊的浸没深度，使得圆柱体之间的这种相互作用力也消失，并且因此每个圆柱体单独地不受水平力。这种现象的参数范围内探讨了小半径的圆柱体的线性理论，并通过一个完全非线性的计算机程序。例如，当浸没深度约为间隔距离的四分之三时，间隔距离约为半波长的配置在每个圆柱体上产生零力。
Two identical circular cylinders are submerged to the same depth in tandem in a stream. There are separation distances between the cylinder centres such that the combination makes no downstream waves, and hence is subject to zero net wave drag. In general there is then a non-zero equal and opposite horizontal force on each cylinder. However, there are special depths of submergence such that this interaction force between the cylinders also vanishes, and hence each cylinder is separately free of horizontal force. The parameter range for this phenomenon is explored both by linear theory for cylinders of small radius, and by a fully nonlinear computer program. For example, a configuration with a separation distance of approximately one half-wavelength gives zero force on each cylinder when the depth of submergence is approximately three-quarters of the separation distance.