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Title: The aerodynamics of non-planar wings
Author: Burnell, S. I.
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 1997
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Studies as early as 1967 have indicated that induced drag of a finite aspect ratio wing can be reduced below that of the classical optimum: the elliptically loaded finite aspect ratio wing by the introduction of spanwise camber into the wing planform. In the current research non-planar wings have been extensively studied both theoretically and experimentally in an attempt to understand the factors which govern their aerodynamic properties. A three degree of freedom traverse has been extensively modified to allow a single tube yawmeter to survey the wake behind a wing accurately and quickly. Results of wake surveys are inferred in the light of the theory advanced by Maskell. A new computational model, The Wing and Free Wake model, which is a combination of classical lifting line theory together with a representation for the wake as it develops downstream, shows that induced drag as calculated by rigid wake methods is a maximum of 18% different to that calculated by the new model for wings with spanwise camber. Extensive experimental studies, both by a wind tunnel balance and by wake surveys, indicate the benefit of wings with negative spanwise camber on the total drag. Maximum reductions in total drag have been found to be in the order of 8% for moderate negative spanwise cambers. The rolling up of the vortex wake has been shown to be of fundamental importance in reducing the induced drag of wings with negative spanwise camber.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available