10 kHz Acetone Molecular Tagging Velocimetry in a Mach 4 Ludwieg Tube

Smith, Cary; Lester, Lauren; Siddiqui, Farhan; Gragston, Mark

doi:10.2514/6.2023-0630

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2024

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Cited by 2 publications

(2 citation statements)

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“…9. Note that the friction velocity and skin-friction values are consistent with measurements by others in the same facility at similar conditions [8,25] but with acetone tagging velocimetry.…”

Section: Multi-line Fleetsupporting

confidence: 89%

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Multi-point FLEET velocimetry in a Mach 4 Ludwieg tube using a diffractive optical element

Siddiqui,

Gragston

2024

Appl. Opt.

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A diffractive optical element was paired with femtosecond laser electronic excitation tagging (FLEET) velocimetry and used to probe multiple locations in a high-speed wind tunnel. Two configurations were explored, one that uses the traditional method of viewing from a perspective orthogonal to the beam axis and another that uses a perspective parallel to the beam axis. In the latter, the FLEET emissions are viewed as points that can allow for FLEET measurements in a wall normal fashion without the laser needing to impinge upon the surface. The configurations are demonstrated in a Mach 4 Ludwieg tube, highlighting their utility in high-speed flow measurements.

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Section: Multi-line Fleetsupporting

confidence: 89%

“…To better validate the results, a least-squares analysis was done to fit a Sun-Childs [24] turbulent boundary layer profile to the FLEET profiles. The calculation was done using the formulation described in Smith et al [25] with room temperature for the wall and results for the fitted profiles for Lines 1 and 2 are shown in Fig. 9.…”

Section: Multi-line Fleetmentioning

confidence: 99%