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 secondary flow structure proposed by previous studies. Decomposing the flow into a large and small scale components, along with conditional 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.
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