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Proceedings Paper

Planar velocity and scalar concentration measurements in shock-accelerated unstable fluid interfaces
Author(s): Cherie Goodenough; Sanjay Kumar; Mark Marr-Lyon; Adam Boyts; Katherine Prestridge; Paul Rightley; Christopher Tomkins; Michael Cannon; James Kamm; William Rider; Cindy Zoldi-Sood; Greg Orlicz; Peter Vorobieff
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Paper Abstract

We report applications of several high-speed photographic techniques to diagnose fluid instability and the onset of turbulence in an ongoing experimental study of the evolution of shock-accelerated, heavy-gas cylinders. Results are at Reynolds numbers well above that associated with the turbulent and mixing transitions. Recent developments in diagnostics enable high-resolution, planar (2D) measurements of velocity fields (using particle image velocimetry, or PIV) and scalar concentration (using planar laser-induced fluorescence, or PLIF). The purpose of this work is to understand the basic science of complex, shock-driven flows and to provide high-quality data for code validation and development. The combination of these high-speed optical methods, PIV and PLIF, is setting a new standard in validating large codes for fluid simulations. The PIV velocity measurements provide quantitative evidence of transition to turbulence. In the PIV technique, a frame transfer camera with a 1 ms separation is used to image flows illuminated by two 10 ns laser pulses. Individual particles in a seeded flow are tracked from frame to frame to produce a velocity field. Dynamic PLIF measurements of the concentration field are high-resolution, quantitative dynamic data that reveal finely detailed structure at several instances after shock passage. These structures include those associated with the incipient secondary instability and late-time transition. Multiple instances of the flow are captured using a single frame Apogee camera and laser pulses with 140 ?s spacing. We describe tradeoffs of diagnostic instrumentation to provide PLIF images.

Paper Details

Date Published: 17 March 2005
PDF: 7 pages
Proc. SPIE 5580, 26th International Congress on High-Speed Photography and Photonics, (17 March 2005); doi: 10.1117/12.577110
Show Author Affiliations
Cherie Goodenough, Los Alamos National Lab. (United States)
Sanjay Kumar, Los Alamos National Lab. (United States)
Mark Marr-Lyon, Los Alamos National Lab. (United States)
Adam Boyts, Los Alamos National Lab. (United States)
Katherine Prestridge, Los Alamos National Lab. (United States)
Paul Rightley, Los Alamos National Lab. (United States)
Christopher Tomkins, Los Alamos National Lab. (United States)
Michael Cannon, Los Alamos National Lab. (United States)
James Kamm, Los Alamos National Lab. (United States)
William Rider, Los Alamos National Lab. (United States)
Cindy Zoldi-Sood, Los Alamos National Lab. (United States)
Greg Orlicz, Univ. of New Mexico (United States)
Peter Vorobieff, Univ. of New Mexico (United States)


Published in SPIE Proceedings Vol. 5580:
26th International Congress on High-Speed Photography and Photonics
Dennis L. Paisley; Stuart Kleinfelder; Donald R. Snyder; Brian J. Thompson, Editor(s)

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