Effect of apex strake incidence-angle on the vortex development and interaction of a double-delta wing |
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Authors: | Myong Hwan Sohn |
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Institution: | (1) Pohang University of Science and Technology, Pohang, Gyeongbuk, 790-784, Republic of Korea |
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Abstract: | The vortex flow characteristics of a sharp-edged delta wing with an apex strake was investigated through the visualization
and particle image velocimetry (PIV) measurement of the wing-leeward flow region, and the wing-surface pressure measurement.
The wing model was a flat-plate, and 65°-sweep cropped-delta wing with sharp leading edges. The apex strake was also a flat-plate
wing with a cropped-delta shape of 65°/90° sweep, and it can change its incidence angle. The flow Reynolds number was 2.2 × 105 for the flow visualization and 8.2 × 105 for the PIV and wing-surface pressure measurements. The physics of the vortex flow in the wing-leeward flow region and the
suction-pressure distribution on the wing upper-surface were interrelated and analyzed. The effect of a positive (negative)
strake incidence-angle was the upward movement of the strake and wing vortices away from (downward movement of the strake
and wing vortices toward) the wing-upper surface and the delayed (enhanced) coiling interaction between them. This change
of vortex flow characteristics projected directly on the suction pressure distribution on the wing upper-surface. |
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