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Instationnarité et dissymétrie d'un écoulement supersonique décollé dans une tuyère plane

Abstract : Steady and unsteady aspects of symmetrical and asymmetrical shock patterns occurring in an overexpanded supersonic planar nozzle have been investigated in the Onera continuous atmospheric transonic/supersonic S8Ch wind tunnel. The fluctuating aspects of the flow were obtained by using Ultra-fast spark shadowgraphy visualization techniques. The nozzle flow topology induced by an asymmetrical shock structure is described thanks to three-dimensional Laser Doppler Velocimetry (LDV) measurements and skin friction lines visualisations. The thorough examination of the two separated flow regions induced by shock/boundary layer interactions has allowed to point out low frequency phenomena (50-60Hz) due to the convection of large vortical structures. Thus, the spectral analysis of unsteady wall pressure measurements in the symmetrical and asymmetrical cases permitted to find again these low frequency phenomena and to underline frequency peak around 240Hz showing the shock oscillations.
Two-dimensional and steady numerical simulations in supersonic regime had been made to compare several usual turbulence models. The models chosen give different shock configurations. The transient start-up of the wind tunnel simulated numerically shows a asymmetrical final pattern.
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Contributor : Alexis Bourgoing <>
Submitted on : Monday, January 16, 2006 - 1:19:55 PM
Last modification on : Friday, March 12, 2021 - 3:20:18 AM
Long-term archiving on: : Thursday, September 23, 2010 - 3:09:48 PM


  • HAL Id : tel-00003256, version 3


Alexis Bourgoing. Instationnarité et dissymétrie d'un écoulement supersonique décollé dans une tuyère plane. domain_other. Université Pierre et Marie Curie - Paris VI, 2002. Français. ⟨tel-00003256v3⟩



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