On the Birth of Stall Cells on Airfoils

Rodríguez Álvarez, Daniel and Theofilis, Vassilios (2011). On the Birth of Stall Cells on Airfoils. "Theoretical and Computational Fluid Dynamics", v. 25 (n. 1-4); pp. 105-117. ISSN 0935-4964. https://doi.org/10.1007/s00162-010-0193-7.

Description

Title: On the Birth of Stall Cells on Airfoils
Author/s:
  • Rodríguez Álvarez, Daniel
  • Theofilis, Vassilios
Item Type: Article
Título de Revista/Publicación: Theoretical and Computational Fluid Dynamics
Date: 2011
ISSN: 0935-4964
Volume: 25
Subjects:
Freetext Keywords: Stall cells – Flow topology – Global flow instability
Faculty: E.T.S.I. Aeronáuticos (UPM)
Department: Motopropulsión y Termofluidodinámica [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Critical point theory asserts that two-dimensional topologies are defined as degeneracies and any three-dimensional disturbance of a two-dimensional flow will lead to a new three-dimensional flowfield topology, regardless of the disturbance amplitude. Here, the topology of the composite flowfields reconstructed by linear superposition of the two-dimensional flow around a stalled airfoil and the leading stationary three-dimensional global eigenmode has been studied. In the conditions monitored the two-dimensional flow is steady and laminar and is separated over a fraction of the suction side, while the amplitudes considered in the linear superposition are small enough for the linearization assumption to be valid. The multiple topological bifurcations resulting have been analysed in detail; the surface streamlines generated by the leading stationary global mode of the separated flow have been found to be strongly reminiscent of the characteristic stall cells, observed experimentally on airfoils just beyond stall in both laminar and turbulent flow.

More information

Item ID: 10448
DC Identifier: http://oa.upm.es/10448/
OAI Identifier: oai:oa.upm.es:10448
DOI: 10.1007/s00162-010-0193-7
Official URL: http://www.springerlink.com/content/eul4340pm655446j/
Deposited by: Memoria Investigacion
Deposited on: 05 Mar 2012 10:42
Last Modified: 20 Apr 2016 18:39
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