角柱後流域を通過する走行物体に働く非定常空気力　　風洞実験

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タイトル別名
  • Unsteady aerodynamic forces on a vehicle model passing in a wake. (Experiments)
  • カクチュウコウリュウイキ オ ツウカスル ソウコウ ブッタイ ニ ハタラク ヒ

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説明

The response of aerodynamic forces on a vehicle model passing in a wake behind a model of a main tower of a big suspension bridge has been investigated in a wind tunnel. A splitter plate placed behind a tower model prevents the vortex street from shedding in the wake and the effect of surviving velocity gradients is examined. We have prepared two kinds of vehicle models: a cylindrical model with a rectangular section and a box model. The results of the present study may be summarized as follows: (1) When a cylindrical model passes through the wake of a tower model with a splitter plate, the aerodynamic forces are influenced by the effects of an apparent angle of attack, the interference between the flows around a tower and a vehicle, and the effects of transient characteristics of flow. In the case of a box model, the aerodynamic forces are governed by the effects of the angle of attack (2) The fluctuation in a side force exerted on a cylindrical or a box model corresponds to the fluctuation in wind due to a wake vortex street behind a tower model, and its amplitude remarkably increases when a vehicle model gets out of the wake. (3) The aerodynamic forces on a box model respond more rapidly to the change in wind velocity than ones on a cylindrical model.

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