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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.

Record type: Article

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.

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More information

Submitted date: 16 November 2007
Published date: July 2008
Keywords: laminar separation bubble, transitional separation bubble, aerofoil performance, airfoil performance, stall
Organisations: Aerodynamics & Flight Mechanics

Identifiers

Local EPrints ID: 55691
URI: http://eprints.soton.ac.uk/id/eprint/55691
ISSN: 0001-9240
PURE UUID: 67f4c284-b90e-4083-ac5c-86015cfa984e

Catalogue record

Date deposited: 05 Aug 2008
Last modified: 17 Jul 2017 14:32

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