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NUMERICAL INVESTIGATION OF THE LAMINAR-TURBULENT TRANSITION IN A M=4.6 FLAT-PLATE BOUNDARY LAYER FORCED BY WALL INJECTION

E. Orlik
ICARE-CNRS 1C avenue de la Recherche Scientifique, F-45071 Orleans cedex 2, France

Ivan Fedioun
ICARE-CNRS 1C avenue de la Recherche Scientifique, F-45071 Orleans cedex 2, France

Nicolas Lardjane
L.C.S.R./E.P.E.E. - C.N.R.S. 1c, avenue de la Recherche Scientifique 45071 Orleans cedex 2, France; CEA-DAM-DIF F-91297 Arpajon, France

要約

The laminar-turbulent transition of a Mach 4.6 flat-plate boundary layer forced by a wall under-expanded jet is investigated using Implicit Large Eddy Simulation based on a 5th order WENO scheme. Two free-stream unit length Reynolds numbers, 6 and 16 million, are considered. The effects of injection pressure and temperature on the structure and the stability of the near-injection flow are investigated. Downstream breakdown to turbulence is analyzed through Q-criterion visualization, mean velocity profiles and wall parameters. Results show that a low-pressure injection is sufficient for effective tripping, and that a cold injection is more efficient to promote transition.