J. Hoefling, J. Schirra, A. Spohr, D. Schaefer

The capabilities of induced drag prediction for highly non-planar wing configurations are analyzed using a vortex-lattice, a relaxed-wake vortex-lattice and a higher order panel method. Therefore Surface Pressure, Trefftz-Plane and Trailing Edge analysis are studied using planar crescent and elliptical shaped lifting surfaces, concluding that the two latter methods achieve the desired accuracy. In order to study the influences of drag-free and force-free wake model schemes on highly non-planar configurations, two biplane configurations are analyzed. Each method were found to have span efficiencies that agree well with lifting line theory, yet the relaxed-wake vortex-lattice and the higher order panel methods achieved more accurate results regarding induced drag prediction. For the same biplane configuration different downwash distributions and spanlaodings are found, depending on the utilized force-free or drag-free wake model scheme. These differences are associated with the wake sheet and rollup behavior inherited by the force-free wake model scheme and verified by comparison to higher order methods.

Deutscher Luft- und Raumfahrtkongress 2013, Stuttgart

Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn, 2013

Conference Paper

englisch

21,0 x 29,7 cm, 10 Seiten

urn:nbn:de:101:1-20131223873

non-planar, wing weight

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20.12.2013