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Hypersonic N2 boundary layer flow velocity profile measurements using FLEET

Abstract

Femtosecond laser electronic excitation tagging (FLEET) velocimetry was used in the boundary layer of an ogive-cylinder model in a Mach-6 Ludwieg tube. One-dimensional velocity profiles were extracted from the FLEET signal in laminar boundary layers from pure ${{\rm N}_2}$ flows at unit Reynolds numbers ranging from ${3.4} \times {{10}^6}/{\rm m}$ to ${3.9}\; \times {{10}^6}/{\rm m}$. The effects of model tip bluntness and the unit Reynolds number on the velocity profiles were investigated. The challenges and strategies of applying FLEET for direct boundary layer velocity measurement are discussed. The potential of utilizing FLEET velocimetry for understanding the dynamics of laminar and turbulent boundary layers in hypersonic flows is demonstrated.

© 2021 Optical Society of America

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Supplementary Material (2)

NameDescription
Visualization 1       Visualization of 1-kHz FLEET imaging for sharp tip. (The image was captured 5 ms after the excitation pulse.)
Visualization 2       Visualization of 1-kHz FLEET imaging for blunt tip. (The image was captured 5 ms after the excitation pulse.)

Data Availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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