Flow structure generated by laser-induced blast wave propagation through the boundary layer of a flat plate

Ukai, T., Kontis, K. and Yang, L. (2018) Flow structure generated by laser-induced blast wave propagation through the boundary layer of a flat plate. Aerospace Science and Technology, 78, pp. 569-573. (doi: 10.1016/j.ast.2018.05.012)

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Laser energy deposition generates localized flow structures that can be used as flow control devices in high-speed flows. In the present study, the interaction between a laser-induced blast wave and an incoming laminar boundary layer on a flat plate was experimentally investigated at a Mach 5 flow with three different unit Reynolds numbers. A hemispherical laser-induced blast wave (LIBW) is induced by focusing a 532 nm pulsed Nd:YAG laser beam on the surface of the plate. The hemispherical shaped fore wave front of the LIBW is locally transformed to an oblique shape, which results in a laser-induced oblique shock wave (LIOSW). As LIOSW propagates through the laminar boundary layer increases its thickness. With laser energy deposition near the leading edge of the flat plate, the LIOSW interacts and influences the leading edge shock wave (LSW). This interaction could contribute to the modulation of the LSW in scramjet intakes. A weak shock limb generated at the shape transition point of the LIBW or thermal spot due to laser-induced gas breakdown causes the boundary layer perturbation. The geometrical pattern produced due to the interaction between the LIOSW and the disturbed boundary layer remains similar to itself as it grows with time as well as at different local Reynolds numbers, to 2.2 x 105 to 5.7 x 105.

Item Type:Articles
Additional Information:This work has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Grant Agreement No. 654318 for conducting the analysis of this study.
Glasgow Author(s) Enlighten ID:Ukai, Dr Takahiro and Kontis, Professor Konstantinos
Authors: Ukai, T., Kontis, K., and Yang, L.
College/School:College of Science and Engineering > School of Engineering > Aerospace Sciences
Journal Name:Aerospace Science and Technology
ISSN (Online):1626-3219
Published Online:14 May 2018

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