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
Full Article | PDF ArticleMore Like This
Angelina Andrade, Eugene N. A Hoffman, Elijah J. LaLonde, and Christopher S. Combs
Opt. Express 30(23) 42199-42213 (2022)
Paul S. Hsu, Naibo Jiang, Joseph S. Jewell, Josef J. Felver, Matthew Borg, Roger Kimmel, and Sukesh Roy
Opt. Express 28(15) 21982-21992 (2020)
Farhan Siddiqui and Mark Gragston
Appl. Opt. 63(4) 1087-1093 (2024)