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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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 over a supersonic cavity in the open configuration. The excitation was generated with a Q-switched Nd:YAG pulsed 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 measurements. Analysis of phase averaged schlieren images indicated considerable alterations to the cavity flow field in the wake of the generated disturbance. Specifically, the formation and growth of a coherent large-scale structure (consisting of two adjoining vortices) was identified. 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 of a large-scale structure that developed in the shear layer. The large-scale structure generated by the laser induced excitation also appeared to have similar characteristics and a theoretical convective velocity as that proposed by past researchers for compressible shear layers.

Original languageEnglish (US)
Title of host publicationCollection of Technical Papers - 45th AIAA Aerospace Sciences Meeting
Pages14667-14684
Number of pages18
StatePublished - Jul 2 2007
Event45th AIAA Aerospace Sciences Meeting 2007 - Reno, NV, United States
Duration: Jan 8 2007Jan 11 2007

Publication series

NameCollection of Technical Papers - 45th AIAA Aerospace Sciences Meeting
Volume21

Other

Other45th AIAA Aerospace Sciences Meeting 2007
CountryUnited States
CityReno, NV
Period1/8/071/11/07

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering

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