Experimental evindence of three-dimensional perturbations in the reattachment of a two-dimensional laminar boundary layer at M=2,05
J.J. Ginoux
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Abstract
The reattachment of a laminar boundary-layer after separation has been investigated at a Mach number of 2.05. Backward facing step models were used that completely spanned the working section,. Surface flow was observed by a sublimation technique and detailed span-wise surveys were made in the reattachment region of the flow with total head probes. Strong, regular and repeatable span-wise perturbations were observed which could not be explained by irregularities either in the airflow upstream of the models or in the models themselves.