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Prediction of the Wind Tunnel Sidewall Effect for the iGREEN Wing-Tailplane Interference Experiment in the TWG

Gardner, Anthony Donald and Richter, Kai and Rosemann, Henning (2008) Prediction of the Wind Tunnel Sidewall Effect for the iGREEN Wing-Tailplane Interference Experiment in the TWG. [Other] (Submitted)

Full text not available from this repository.

Abstract

The DLR project iGREEN (Integrated Green Aircraft; 2007-2010) investigates the effects of increased aircraft elasticity from optimised structures or new aerodynamic configurations. One work package concerns the wing-tailplane interference through buffet processes and includes experiments in the Transonic Wind Tunnel Goettingen (TWG) adaptive test section in 2010. An NLR7301 airfoil is to be attached to a flutter rig providing high-frequency pitching oscillations upstream of an elastic swept wing. In support of the experimental work, RANS computations with the DLR-TAU code were started in 2007 to quantify the effects of the TWG side-wall boundary layer on the experiment, and to identify potential problems. Computations for the NLR7301 comparing viscous and symmetry sidewalls identified significant changes due to the side-wall boundary layer at high Mach number and angle of attack. Here 3D separation bubbles form at the join between the wall and both the upper and lower sides of the airfoil. These separations act as displacing bodies which accelerate the flow, giving an effect vaguely similar to a reduction in angle of attack. Further investigation using 2D computations with a corrected angle of attack could only approximately reproduce the effect shown.

Document Type:Other
Title:Prediction of the Wind Tunnel Sidewall Effect for the iGREEN Wing-Tailplane Interference Experiment in the TWG
Authors:
AuthorsInstitution or Email of Authors
Gardner, Anthony DonaldUNSPECIFIED
Richter, KaiUNSPECIFIED
Rosemann, HenningUNSPECIFIED
Date:July 2008
Journal or Publication Title:STAB Jahresbericht 2008 als Mitteilung
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:2
Status:Submitted
Keywords:CFD, TAU, TWG, wall interference, iGreen
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 - Flexible Aircraft (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > High Speed Configurations
Deposited By: Dr. Anthony Gardner
Deposited On:11 Jul 2008
Last Modified:27 Apr 2009 15:03

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