D.P. Ramaswamy, A. Barklage, A.-M. Schreyer

An experimental analysis was carried out to assess the flow organisation and control effectiveness of an array of air-jet vortex generators (AJVGs) on an axisymmetric 33° flare induced shock-wave/boundary layer interaction at Mach 5.15. This is the first study of AJVGs in a hypersonic shock-wave/boundary layer interaction. Flow configurations for three different Reynolds numbers and various momentum-flux ratios (J) were investigated using schlieren and surface oil-flow visualisations. The jets have a diameter of 1mm and are pitched at 45° with respect to the local surface tangent, resulting in a purely azimuthal injection. Well defined separation and reattachment shocks were captured in the uncontrolled baseline configuration for all tested Reynolds numbers with minimal variation in their structure. Upon jet-injection, asymmetric pairs of counter rotating vortices are generated, which alter the structure of the boundary layer and the separation shock. Only a weak influence of air-jet vortex generators was seen at low momentum-flux ratios and flow Reynolds numbers. At higher values of J and Reynolds numbers, the jets represent a large obstruction, resulting in even earlier flow separation than in the uncontrolled case. This rather unexpected result may be related to the axisymmetry of the flow field.

Deutscher Luft- und Raumfahrtkongress 2020

Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn, 2020

Conference Paper

englisch

21,0 x 29,7 cm, 9 Seiten

urn:nbn:de:101:1-2020091813135066718558

10.25967/530277

hypersonic shock-wave, air-jet vortex generators, boundary-layer, flow control, hypersonic shock-wave/boundary-layer interaction

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Ramaswamy, D.P.; Barklage, A.; Schreyer, A.-M. (2020): Separation Control using Air-Jet Vortex Generators in a Hypersonic Shock-Induced Boundary-Layer Separation. Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V.. (Text). https://doi.org/10.25967/530277. urn:nbn:de:101:1-2020091813135066718558.

18.09.2020