Turbulence characteristics of supersonic corner flows in a low aspect ratio rectangular channel Rohan R. Morajkar * , Mirko Gamba † Department of Aerospace Engineering, University of Michigan, Ann Arbor, MI 48105 In this study we present the experimental results of stereo particle image velocimetry conducted in the corner of a Mach 2.75 low aspect ratio rectangular channel flow. Data is recorded at multiple cross-section planes and analyzed to study the formation of corner vortices and their effects on the structure of the mean flow field. Results show that several vortex elements exist instantaneously in the corner, however they do not conform to the time-averaged secondaryflow structure proposed by previous studies. Decomposing the flow into a large and small scale components, along with condi- tional averaging, makes it possible to capture and describe the properties of, the large scale corner vortices which are similar to the description of corner vortex pair proposed by previous studies. A conditional definition of corner vortex pair in instantaneous fields is introduced which facilitates the statistical study of their properties. Nomenclature x = Streamwise flow direction y = Side-wall normal direction z = Bottom-wall normal direction U = Ensemble-average streamwise flow velocity component V = Ensemble-average flow velocity in y-direction W = Ensemble-average flow velocity in z-direction u = Instantaneous velocity in x-direction v = Instantaneous velocity in y-direction w = Instantaneous velocity in z-direction t = Wall tangential direction n = Wall normal direction δ 99 = 99 % boundary layer thickness ω RR = Rigid rotation vorticity ω = Conventional vorticity Subscripts: x,y,z = Derivative in respective direction w = Quantity evaluated at the wall ∞ = Quantity evaluated in freestream L,S = Large and Small scale quantity Superscripts: 0 = Fluctuation quantity + = Inner wall scale Other: ψ, hψi = Ensemble average of property ψ * Graduate Student Research Assistant, AIAA Member, rohanrm@umich.edu † Assistant Professor, AIAA Member, mirkog@umich.edu 1 of 31 American Institute of Aeronautics and Astronautics Downloaded by University of Michigan - Duderstadt Center on December 14, 2017 | http://arc.aiaa.org | DOI: 10.2514/6.2016-1590 54th AIAA Aerospace Sciences Meeting 4-8 January 2016, San Diego, California, USA 10.2514/6.2016-1590 Copyright © 2016 by Rohan Morajkar, Mirko Gamba. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. AIAA SciTech Forum