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Origin of transonic buffet on aerofoils

Published online by Cambridge University Press:  01 June 2009

J. D. CROUCH ,
A. GARBARUK ,
D. MAGIDOV  and
A. TRAVIN
J. D. CROUCH*
Affiliation:
The Boeing Company, Seattle, WA 98124-2207, USA
A. GARBARUK
Affiliation:
Saint Petersburg Polytechnic University, St Petersburg, 195251 Russia
D. MAGIDOV
Affiliation:
Saint Petersburg Polytechnic University, St Petersburg, 195251 Russia
A. TRAVIN
Affiliation:
Saint Petersburg Polytechnic University, St Petersburg, 195251 Russia
*
†Email address for correspondence: jeffrey.d.crouch@boeing.com
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Abstract

Buffeting flow on transonic aerofoils serves as a model problem for the more complex three-dimensional flows responsible for aeroplane buffet. The origins of transonic aerofoil buffet are linked to a global instability, which leads to shock oscillations and dramatic lift fluctuations. The problem is analysed using the Reynolds-averaged Navier–Stokes equations, which for the foreseeable future are a necessary approximation to cover the high Reynolds numbers at which transonic buffet occurs. These equations have been shown to reproduce the key physics of transonic aerofoil flows. Results from global-stability analysis are shown to be in good agreement with experiments and numerical simulations. The stability boundary, as a function of the Mach number and angle of attack, consists of an upper and a lower branch – the lower branch shows features consistent with a supercritical bifurcation. The unstable modes provide insight into the basic character of buffeting flow at near-critical conditions and are consistent with fully nonlinear simulations. The results provide further evidence linking the transonic buffet onset to a global instability.

Information

Type
Papers
Information
Journal of Fluid Mechanics , Volume 628 , 10 June 2009 , pp. 357 - 369
Copyright
Copyright © Cambridge University Press 2009

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