風胴実験に用いる地面盤上の境界層を除去する簡単な方法について
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概要
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This report summarizes the work to date on the removal of the boundary layer on a flat plate for use with Wing In Surface Effect Ship (WISES) model testing. A simple practical method is described which involves the use of a contraction and slot in order to suck the boundary layer from the plate. Theoretical aspects of the design are discussed with relation to the level of suction and the slot width. The boundary layer height was obtained through measurement of the mean velocity profile and a reduction of 50% was generally observed when suction was used. The effects on the forces on a low aspect-ratio wing were used to verify the technique for wing heights above 2.5% of the mean chord. Below this height separation of the boundary layer on the ground plate is thought to have altered the pressure distribution on the wing.
- 1995-07-30