Laser energy deposition effectiveness on shock-wave boundary-layer interactions over cylinder-flare combinations

Osuka, T., Erdem, E., Hasegawa, N., Majima, R., Tamba, T., Yokota, S., Sasoh, A. and Kontis, K. (2014) Laser energy deposition effectiveness on shock-wave boundary-layer interactions over cylinder-flare combinations. Physics of Fluids, 26(9), 096103. (doi: 10.1063/1.4896288)

Abstract

The effects of repetitive laser-pulse energy depositions (5.5 mJ/pulse) onto a shock wave-boundary layer interaction region over cylinder-flare model in a Mach 1.92 flow are experimentally investigated. Depending on the nose shape and the flare angle, the flow patterns are subdivided to two; separated flow in which a slip line and a strong separation shock wave originated in the nose-cylinder junction appears, and a non-separated flow in which a slip line is not observed and the re-attachment shock wave is much weaker. At flare angles around 30°, the separation can be suppressed by laser energy deposition even of down to 5 kHz. The Schlieren-visualized flow patterns are well correlated to the drag characteristics, in which a larger drag is obtained without separation. A possible scenario of the separation control is that the disturbance introduced by the baroclinic vortex ring induced the boundary layer transition so that it became robust against the adverse pressure gradient. Under marginal conditions, dual mode flow patterns, that is, a partial and full suppression modes are obtained under the same operation conditions.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Kontis, Professor Konstantinos and Erdem, Dr Erinc
• Authors: Osuka, T., Erdem, E., Hasegawa, N., Majima, R., Tamba, T., Yokota, S., Sasoh, A., and Kontis, K.
• College/School: College of Science and Engineering > School of Engineering; College of Science and Engineering > School of Engineering > Autonomous Systems and Connectivity
• Journal Name: Physics of Fluids
• Journal Abbr.: Phys. fluids
• Publisher: American Institute of Physics
• ISSN: 1070-6631
• ISSN (Online): 1089-7666