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Autor(en):
D. Pearman
Zusammenfassung:
Optimisation of lifting surface span-loads using lifting-line theory has established the elliptic distribution to be ideal for given span while constraining weight generates solutions that reduce induced drag but incur span increases. This theoretical study extends the latter´s theory to include moments of lift and of induced drag and investigates their characteristics in relation to the elliptic case. Evaluation for variable span determines reductions in moment of induced drag by up to 44% and yields negative values in outboard regions of the spanwise distributions of both induced drag and its moment, corroborating experimentally observed proverse yaw. These results provide theoretical affirmation of suitably placed control surfaces potentially obviating dedicated yaw devices. Evaluation for given span leads to simultaneous increase in induced drag by up to 33% as well as decreases in moment of lift and of induced drag of up to 20% and 33 %, respectively. The latter two results predict power reductions for driven rotors by minimising rotary moment instead of wake energy as well as noise abatement by lessening tip flow discontinuities.
Veranstaltung:
Deutscher Luft- und Raumfahrtkongress 2022, Dresden
Verlag, Ort:
Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn, 2022
Medientyp:
Conference Paper
Sprache:
englisch
Format:
21,0 x 29,7 cm, 9 Seiten
URN:
urn:nbn:de:101:1-2022122810595305629790
DOI:
10.25967/570033
Stichworte zum Inhalt:
Lift distribution, lifting-line theory, moment, rotor blade, span-load, wing
Verfügbarkeit:
Download - Bitte beachten Sie die Nutzungsbedingungen dieses Dokuments: CC BY-NC-SA 4.0OPEN ACCESS
Kommentar:
Zitierform:
Pearman, D. (2022): On Wings of Minimal Moments. Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V.. (Text). https://doi.org/10.25967/570033. urn:nbn:de:101:1-2022122810595305629790.
Veröffentlicht am:
28.12.2022