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Aerospace 2018, 5(3), 98; https://doi.org/10.3390/aerospace5030098

Leading-Edge Roughness Affecting Diamond-Wing Aerodynamic Characteristics

Chair of Aerodynamics and Fluid Mechanics, Department of Mechanical Engineering, Technical University of Munich, Boltzmannstr. 15, D-85748 Garching by Munich, Germany
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Received: 1 August 2018 / Revised: 27 August 2018 / Accepted: 29 August 2018 / Published: 19 September 2018
(This article belongs to the Collection Feature Papers in Aerospace)
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Abstract

Diamond wing configurations for low signature vehicles have been studied in recent years. Yet, despite numerous research on highly swept, sharp edged wings, little research on aerodynamics of semi-slender wings with blunt leading-edges exists. This paper reports on the stall characteristics of the AVT-183 diamond wing configuration with variation of leading-edge roughness size and Reynolds number. Wind tunnel testing applying force and surface pressure measurements are conducted and the results presented and analysed. For the investigated Reynolds number range of 2.1 × 10 6 R e 2.7 × 10 6 there is no significant influence on the aerodynamic coefficients. However, leading-edge roughness height influences the vortex separation location. Trip dots produced the most downstream located vortex separation onset. Increasing the roughness size shifts the separation onset upstream. Prior to stall, global aerodynamic coefficients are little influenced by leading-edge roughness. In contrast, maximum lift and maximum angle of attack is reduced with increasing disturbance height. Surface pressure fluctuations show dominant broadband frequency peaks, distinctive for moderate sweep vortex breakdown. The experimental work presented here provides insights into the aerodynamic characteristics of diamond wings in a wide parameter space including a relevant angle of attack range up to post-stall. View Full-Text
Keywords: AVT-183 diamond wing; experimental aerodynamics; leading-edge vortex; leading-edge roughness effect; vortex breakdown; stall AVT-183 diamond wing; experimental aerodynamics; leading-edge vortex; leading-edge roughness effect; vortex breakdown; stall
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Buzica, A.; Debschütz, L.; Knoth, F.; Breitsamter, C. Leading-Edge Roughness Affecting Diamond-Wing Aerodynamic Characteristics. Aerospace 2018, 5, 98.

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