Semi-span wind tunnel testing without conventional peniche

Skinner, S.N. and Behtash, H. Z. (2017) Semi-span wind tunnel testing without conventional peniche. Experiments in Fluids, 58(12), 163. (doi: 10.1007/s00348-017-2442-7)

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Low-speed wind tunnel tests of a flexible wing semi-span model have been implemented in the 9×79×7 ft de Havilland wind tunnel at the University of Glasgow. The main objective of this investigation is to quantify the effect of removing the traditional peniche boundary layer spacer utilised in this type of testing. Removal of the peniche results in a stand-off gap between the wind tunnel wall and the model’s symmetry plane. This offers the advantage of preventing the development of a horseshoe vortex in front of the model, at the peniche/wall juncture. The formation of the horseshoe vortex is known to influence the flow structures around the entire model and thus alters the model’s aerodynamic behaviours. To determine the influence of the stand-off gap, several gap heights have been tested for a range of angles of attack at Re=1.5×106Re=1.5×106 , based on the wing mean aerodynamic chord (MAC). Force platform data have been used to evaluate aerodynamic coefficients, and how they vary with stand-off heights. Stereoscopic Particle Imaging Velocimetry (sPIV) was used to examine the interaction between the tunnel boundary layer and model’s respective stand-off gap. In addition, clay and tuft surface visualisation enhanced the understanding of how local flow structures over the length of the fuselage vary with stand-off height and angle of attack. The presented results show that a stand-off gap of four-to-five times the displacement thickness of the tunnel wall boundary layer is capable of achieving a flow field around the model fuselage that is representative of what would be expected for an equivalent full-span model in free-air—this cannot be achieved with the application of a peniche.

Item Type:Articles
Glasgow Author(s) Enlighten ID:SKINNER, SHAUN and Zare-Behtash, Dr Hossein
Authors: Skinner, S.N., and Behtash, H. Z.
College/School:College of Science and Engineering > School of Engineering > Autonomous Systems and Connectivity
Journal Name:Experiments in Fluids
ISSN (Online):1432-1114
Published Online:08 November 2017
Copyright Holders:Copyright © 2017 Crown Copyright
First Published:First published in Experiments in Fluids 58(12):163
Publisher Policy:reproduced with the permission of the Controller of HMSO and the Queen’s Printer for Scotland

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
647261National Wind Tunnel FacilityFrank CotonEngineering and Physical Sciences Research Council (EPSRC)EP/L024888/1VPO (ACADEMIC & EDUCATIONAL INNOVATION)