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Windtunnel-flight correlation for laminar wings in adiabatic and heating flow conditions

Stock, H.W. (2002) Windtunnel-flight correlation for laminar wings in adiabatic and heating flow conditions. Aerospace Science & Technology, 6 (4), pp. 245-257.

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Abstract

The DoAL3 airfoil was designed for a laminar wing of a commuter aircraft with small leading edge sweep flying at moderate Mach numbers, M = 0.45-0.6, and Reynolds numbers up to Re = 14 x 10xx6. Free transition measurements were executed in the Transonic Wind Tunnel Braunschweig (TWB) of the DLR, German Aerospace Center, at a Mach number of 0.48 and a Reynolds number of 3.2 x 10xx6. To quantify the airfoil performance for flight Reynolds numbers a Navier-Stokes method coupled to eN transition prediction is applied. The limiting N factor for the TWB facility has been shown beforehand to achieve a value of six, in flight a mean value of twelve can be expected. The extrapolation to flight Reynolds numbers considers the aircraft flying in adiabatic and heating flow conditions. When exposed to extensive sunshine on the airfield the fuel contained in the wet wings will be heated and the aircraft is then flying a considerable time in climb and cruise with wings exposed to non negligible heat transfer. The effects of Reynolds number and heat transfer on the extent of laminar wing flow are investigated separately. The important findings of the numerical study are, firstly, that in adiabatic conditions the wing will fly with the same extent of the laminar bucket as observed in the wind tunnel. Secondly, in heating conditions laminarity is completely lost, the drag is almost doubled with respect to the minimum drag for adiabatic flows.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=2002,
Title:Windtunnel-flight correlation for laminar wings in adiabatic and heating flow conditions
Authors:
AuthorsInstitution or Email of Authors
Stock, H.W.UNSPECIFIED
Date:2002
Journal or Publication Title:Aerospace Science & Technology
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:6
Page Range:pp. 245-257
Status:Published
Keywords:Laminar wing, Navier-Stokes method, eN transition prediction
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology
Deposited By: Claudia Grant
Deposited On:31 Jan 2006
Last Modified:14 Jan 2010 18:59

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