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单词 Vortex trail
释义

Vortex trail

中文百科

卡门涡街 Kármán vortex street

(重定向自Vortex trail)
卡门涡街
美国太空总署拍摄的智利海岸的胡安·费尔南德斯群岛周围的风引起的卡门涡街
德国巴登古堡中的风弦琴

卡门涡街Kármán vortex streetvon Kármán vortex sheet)。在流体中安置阻流体,在特定条件下会出现不稳定的边界层分离,阻流体下游的两侧,会产生两道非对称地排列的旋涡,其中一侧的旋涡循时针方向转动,另一旋涡则反方向旋转,这两排旋涡相互交错排列,各个旋涡和对面两个旋涡的中间点对齐,如街道两边的街灯般,这种现象,因匈牙利裔美国空气动力学家西奥多·冯·卡门最先从理论上阐明而得名卡门涡街

河水流过障碍物时,经常可见卡门涡街。冯·卡门曾在意大利北部博洛尼亚的一所教堂里,目睹一幅圣克里斯多福背负耶稣化身的儿童,赤足渡河的油画,画家画出圣克里斯多福的脚跟在河水中造成两排交错的旋涡,冯·卡门说,这是卡门涡街最早的记录。

英语百科

Kármán vortex street 卡门涡街

(重定向自Vortex trail)
Visualisation of the vortex street behind a circular cylinder in air; the flow is made visible through release of oil vapour in the air near the cylinder
Animation of vortex street created by a cylindrical object; the flow on opposite sides of the object is given different colors, showing that the vortices are shed from alternating sides of the object
A look at the Kármán vortex street effect from ground level, as air flows quickly from the Pacific ocean eastward over Mojave desert mountains.
Kármán vortex street caused by wind flowing around the Juan Fernández Islands off the Chilean coast

In fluid dynamics, a Kármán vortex street (or a von Kármán vortex sheet) is a repeating pattern of swirling vortices caused by the unsteady separation of flow of a fluid around blunt bodies. It is named after the engineer and fluid dynamicist Theodore von Kármán, and is responsible for such phenomena as the "singing" of suspended telephone or power lines, and the vibration of a car antenna at certain speeds.

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更新时间:2025/6/17 1:02:52