Infrared thermography investigation of transitional flow over isolated roughness at high speed

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Abstract

The transitional flow features over and downstream of isolated roughness elements in hypersonic flow are investigated by means of infrared thermography. The local heat flux distribution in the wake of the roughness element reveals the footprint of multiple streamwise counter-rotating vortex pairs. The formation of a turbulent wedge with the spanwise spreading of the wake in the downstream region indicates the early stage of transition and breakdown to turbulence. The onset location of transition is predicted by detecting the origin of the turbulent wedge. Strong dependence of the transition process on the roughness geometry is observed, with significant variations of the lateral spreading rate in the turbulent wedge. Instead, for the present flow conditions negligible variations are associated to changes in Reh
Original languageEnglish
Title of host publication51st 3AF International Conference on Applied Aerodynamics
Subtitle of host publicationStrasbourg - France
Pages1-10
Number of pages10
Publication statusPublished - Apr 2016
Event51st 3AF International Conference on Applied Aerodynamics: Thermal effects and aerodynamics - Strasbourg, France
Duration: 4 Apr 20176 Apr 2017
Conference number: 51
http://www.3af-aerodynamics2016.com/

Conference

Conference51st 3AF International Conference on Applied Aerodynamics
Abbreviated titleAerodynamics 2016
CountryFrance
CityStrasbourg
Period4/04/176/04/17
Internet address

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