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Effect of apex strake incidence-angle on the vortex development and interaction of a double-delta wing

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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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Acknowledgments

This research was sponsored by the Korea Science and Engineering Foundation (Grant Number KOSEF R01-2003-000-10744-0). The author would like to thank KOSEF.

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Authors and Affiliations

  1. Pohang University of Science and Technology, Pohang, Gyeongbuk, 790-784, Republic of Korea

    Myong Hwan Sohn

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  1. Myong Hwan Sohn
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Correspondence to Myong Hwan Sohn.

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Sohn, M.H. Effect of apex strake incidence-angle on the vortex development and interaction of a double-delta wing. Exp Fluids 48, 565–575 (2010). https://doi.org/10.1007/s00348-009-0644-3

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  • DOI: https://doi.org/10.1007/s00348-009-0644-3

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