TY - JOUR
T1 - Profiles of streamwise velocity and fluctuations in a hypersonic turbulent boundary layer using acetone tagging velocimetry
AU - Segall, Ben A.
AU - Shekhtman, David
AU - Hameed, Ahsan
AU - Chen, James H.
AU - Parziale, Nicholaus J.
N1 - Publisher Copyright:
© 2023, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
PY - 2023/6
Y1 - 2023/6
N2 - Acetone tagging velocimetry (ATV) with nominally 1% mole fraction acetone seeding was conducted in a shock-tunnel-generated hypersonic turbulent boundary layer over a hollow-cylinder-flare at Me= 6.05 , Tw/ Tr= 0.65 , Re θ= 8925 , and Re τ= 408 . This single-laser tagging velocimetry experiment measured streamwise velocity and fluctuations, u¯ and uRMS′ , had a repetition rate of 50 kHz, and did not require the use of an image intensifier. The ATV data are non-dimensionalized via the van Driest transformation and compares well with the literature down to y+≈ 3 ; this is into the viscous sublayer. The Morkovin-scaled fluctuations matched the literature for y+> 10 ; however, below y+≈ 10 , it appears that the noise introduced by the measurement technique, in addition to the velocity differences being small near the wall, rendered the ATV-measured Morkovin-scaled fluctuations below y+= 10 not useful.
AB - Acetone tagging velocimetry (ATV) with nominally 1% mole fraction acetone seeding was conducted in a shock-tunnel-generated hypersonic turbulent boundary layer over a hollow-cylinder-flare at Me= 6.05 , Tw/ Tr= 0.65 , Re θ= 8925 , and Re τ= 408 . This single-laser tagging velocimetry experiment measured streamwise velocity and fluctuations, u¯ and uRMS′ , had a repetition rate of 50 kHz, and did not require the use of an image intensifier. The ATV data are non-dimensionalized via the van Driest transformation and compares well with the literature down to y+≈ 3 ; this is into the viscous sublayer. The Morkovin-scaled fluctuations matched the literature for y+> 10 ; however, below y+≈ 10 , it appears that the noise introduced by the measurement technique, in addition to the velocity differences being small near the wall, rendered the ATV-measured Morkovin-scaled fluctuations below y+= 10 not useful.
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U2 - 10.1007/s00348-023-03647-2
DO - 10.1007/s00348-023-03647-2
M3 - Article
AN - SCOPUS:85161856262
SN - 0723-4864
VL - 64
JO - Experiments in Fluids
JF - Experiments in Fluids
IS - 6
M1 - 122
ER -