Transitional separation bubbles and unsteady aspects of aerofoil stall


Sandham, N.D. (2008) Transitional separation bubbles and unsteady aspects of aerofoil stall Aeronautical Journal, 112, (1133), pp. 395-404.

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Description/Abstract

A time-accurate solution method for the coupled potential flow and integral boundary-layer equations is used to study aerofoils near stall, where laboratory experiments have shown high-amplitude low-frequency oscillations. The laminar-turbulent transition model incorporates an absolute instability formulation, which allows the transition process in separation bubbles to be sustained in the absence of upstream disturbances, in agreement with recent direct numerical simulations. The method is demonstrated to capture large scale flow oscillations with Strouhal numbers and amplitudes comparable to experiments. The success of this particular physical model suggests that bubble bursting is primarily due to a potentialflow/ boundary-layer interaction effect, in which relatively simple models of boundary layer transition and turbulence suffice to describe the key phenomena.

Item Type: Article
ISSNs: 0001-9240 (print)
Related URLs:
Keywords: laminar separation bubble, transitional separation bubble, aerofoil performance, airfoil performance, stall
Subjects:
Organisations: Aerodynamics & Flight Mechanics
ePrint ID: 55691
Date :
Date Event
16 November 2007Submitted
July 2008Published
Date Deposited: 05 Aug 2008
Last Modified: 16 Apr 2017 17:43
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/55691

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