Multi-line FLEET by imaging periodic masks

Journal Article · Fri Jul 10 00:00:00 EDT 2020 · Optics Letters

DOI:https://doi.org/10.1364/OL.392779· OSTI ID:1634808

Zhang, Yibin ^[1]; Marshall, Garrett ^[2]; Beresh, Steven J. ^[1]; Richardson, Daniel ^[1]; Casper, Katya M. ^[1]

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1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Vanderbilt Univ., Nashville, TN (United States)

A simple linear configuration for multi-line FLEET velocimetry is used for the first time to image an overexpanded unsteady supersonic jet. The FLEET lines are spaced 0.5-1.0 mm apart and up to six lines can simultaneously be used to visualize the flowfield. These lines are created using periodic masks, despite the mask blocking 25 — 30% of the 10 mJ incident beam. Maps of mean single-component velocity in the direction along the principal flow axis, and turbulence intensity in that same direction, are created using multi-line FLEET, and computed velocities agree well with that obtained from single-line (traditional) FLEET. Compared to traditional FLEET, multi-line FLEET offers increased simultaneous spatial coverage and the ability to produce spatial correlations in the streamwise direction. This FLEET permutation is especially well-suited for short-duration test facilities

• Research Organization: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: AC04-94AL85000; NA0003525
• OSTI ID: 1634808
• Alternate ID(s): OSTI ID: 1637747
• Report Number(s): SAND2020--5817J; 686529
• Journal Information: Optics Letters, Journal Name: Optics Letters Journal Issue: 14 Vol. 45; ISSN 0146-9592; ISSN OPLEDP
• Publisher: Optical Society of America (OSA)
• Country of Publication: United States
• Language: English

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