Application of particle image velocimetry in high-speed separated flows

M. J. Molezzi; J. C. Dutton

doi:10.2514/3.11349

Application of particle image velocimetry in high-speed separated flows

M. J. Molezzi, J. C. Dutton

Aerospace Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

A particle image velocimetry (PIV) system has been developed for use in high-speed separated air flows. The complete system was developed to improve the spatial resolution and accuracy of the PIV technique as applied in high-speed compressible flows and is the first to incorporate both birefringent image shifting and submicron seed particles for analysis of separated flowfields. The system has been proven in preliminary experiments using a simple low-speed round jet flow and has been validated for accuracy with both known displacement simulated PIV photographs and with uniform flow experiments at Mach 0.5 (170 m/s) for comparison with pressure and laser Doppler velocimeter data. PIV data have also been obtained in the separated wake region behind a two-dimensional base model in a Mach 0.4 freestream flow (135-220 m/s) with resolution of velocity in 1.0-mm² regions, revealing features of the von Karman vortex street wake and underlying small-scale turbulence.

Original language	English (US)
Pages (from-to)	438-446
Number of pages	9
Journal	AIAA journal
Volume	31
Issue number	3
DOIs	https://doi.org/10.2514/3.11349
State	Published - Mar 1993

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Aerospace Engineering

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title = "Application of particle image velocimetry in high-speed separated flows",

abstract = "A particle image velocimetry (PIV) system has been developed for use in high-speed separated air flows. The complete system was developed to improve the spatial resolution and accuracy of the PIV technique as applied in high-speed compressible flows and is the first to incorporate both birefringent image shifting and submicron seed particles for analysis of separated flowfields. The system has been proven in preliminary experiments using a simple low-speed round jet flow and has been validated for accuracy with both known displacement simulated PIV photographs and with uniform flow experiments at Mach 0.5 (170 m/s) for comparison with pressure and laser Doppler velocimeter data. PIV data have also been obtained in the separated wake region behind a two-dimensional base model in a Mach 0.4 freestream flow (135-220 m/s) with resolution of velocity in 1.0-mm2 regions, revealing features of the von Karman vortex street wake and underlying small-scale turbulence.",

author = "Molezzi, {M. J.} and Dutton, {J. C.}",

note = "Funding Information: The authors gratefully acknowledge the support of the U.S. Army Research Office through Thomas L. Doligalski and the University of Illinois in funding this research. The authors also wish to extend thanks to Ronald A. Rosner for his work in developing the interrogation software and to R. J. Adrian, R. D. Keane, P. W. Offutt, and A. K. Prasad of the Department of Theoretical and Applied Mechanics, University of Illinois at Urbana-Champaign, for their useful advice in the develop- ment of this system.",

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N2 - A particle image velocimetry (PIV) system has been developed for use in high-speed separated air flows. The complete system was developed to improve the spatial resolution and accuracy of the PIV technique as applied in high-speed compressible flows and is the first to incorporate both birefringent image shifting and submicron seed particles for analysis of separated flowfields. The system has been proven in preliminary experiments using a simple low-speed round jet flow and has been validated for accuracy with both known displacement simulated PIV photographs and with uniform flow experiments at Mach 0.5 (170 m/s) for comparison with pressure and laser Doppler velocimeter data. PIV data have also been obtained in the separated wake region behind a two-dimensional base model in a Mach 0.4 freestream flow (135-220 m/s) with resolution of velocity in 1.0-mm2 regions, revealing features of the von Karman vortex street wake and underlying small-scale turbulence.

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Application of particle image velocimetry in high-speed separated flows

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