Control of the shear layer above a supersonic cavity using energy deposition

E. Lazar; G. Elliotts; N. Glumac

doi:10.2514/1.32835

Control of the shear layer above a supersonic cavity using energy deposition

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Abstract

An experimental study was conducted to investigate the effectiveness of pulsed energy deposition as a means of active flow control for the shear layer above a supersonic cavity in the open configuration. The excitation pulse was generated with a Q-s witched Nd:YAG laser and was applied as a spanwise oriented line along the leading edge of a cavity. The study was conducted at a freestream Mach number of 1.4 and for a cavity length-to-depth ratio of 5.29. The flow field was analyzed over a range of delay times from the excitation laser pulse using schlieren photography and particle image velocimetry. Analysis of phase-averaged schlieren images suggested the formation and growth of a coherent large-scale structure (consisting of two adjoining vortices) in the wake of the generated disturbance. This result was confirmed through two-component velocity field data obtained from particle image velocimetry measurements. The velocity information was also used to determine the instantaneous convective velocity and define characteristic scales for the large-scale structure.

Original language	English (US)
Pages (from-to)	2987-2997
Number of pages	11
Journal	AIAA journal
Volume	46
Issue number	12
DOIs	https://doi.org/10.2514/1.32835
State	Published - Dec 2008

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Aerospace Engineering

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title = "Control of the shear layer above a supersonic cavity using energy deposition",

abstract = "An experimental study was conducted to investigate the effectiveness of pulsed energy deposition as a means of active flow control for the shear layer above a supersonic cavity in the open configuration. The excitation pulse was generated with a Q-s witched Nd:YAG laser and was applied as a spanwise oriented line along the leading edge of a cavity. The study was conducted at a freestream Mach number of 1.4 and for a cavity length-to-depth ratio of 5.29. The flow field was analyzed over a range of delay times from the excitation laser pulse using schlieren photography and particle image velocimetry. Analysis of phase-averaged schlieren images suggested the formation and growth of a coherent large-scale structure (consisting of two adjoining vortices) in the wake of the generated disturbance. This result was confirmed through two-component velocity field data obtained from particle image velocimetry measurements. The velocity information was also used to determine the instantaneous convective velocity and define characteristic scales for the large-scale structure.",

author = "E. Lazar and G. Elliotts and N. Glumac",

note = "Funding Information: The authors would like to thank the U.S. Air Force Office of Scientific Research with John Schmisseur for funding this work on energy deposition using laser-induced optical breakdown (FA9550-07-0215). Any opinions, findings and conclusions, or recommendations expressed in the material are those of the authors and do not necessarily reflect the views of the U.S. Air Force Office of Scientific Research. Additionally, we would like to thank our colleagues Doyle Knight, Graham Candler, and Hong Yan for their discussions and input regarding this work.",

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N2 - An experimental study was conducted to investigate the effectiveness of pulsed energy deposition as a means of active flow control for the shear layer above a supersonic cavity in the open configuration. The excitation pulse was generated with a Q-s witched Nd:YAG laser and was applied as a spanwise oriented line along the leading edge of a cavity. The study was conducted at a freestream Mach number of 1.4 and for a cavity length-to-depth ratio of 5.29. The flow field was analyzed over a range of delay times from the excitation laser pulse using schlieren photography and particle image velocimetry. Analysis of phase-averaged schlieren images suggested the formation and growth of a coherent large-scale structure (consisting of two adjoining vortices) in the wake of the generated disturbance. This result was confirmed through two-component velocity field data obtained from particle image velocimetry measurements. The velocity information was also used to determine the instantaneous convective velocity and define characteristic scales for the large-scale structure.

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Control of the shear layer above a supersonic cavity using energy deposition

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