TY - GEN
T1 - Comparison of aero-optic distortion in hypersonic and transonic, turbulent boundary layers with gas injection
AU - Wyckham, Christopher M.
AU - Smits, Alexander J.
PY - 2006
Y1 - 2006
N2 - A Shack-Hartmann wavefront sensor is optimized for the study of aero-optic distortion in turbulent boundary layers at transonic and hypersonic flows. An extensive database of wavefronts, collected under a variety of flow conditions, with and without gas injection into the boundary layer, is examined. The Large Scale Motions of the outer boundary layer are found to be the aero-optically dominant structures, the Large Aperture Approximation is validated, and a new scaling argument for the rms phase distortion is proposed. The use of a combination of helium injection and low temporal bandwidth adaptive optics for the mitigation of aero-optic distortions is also evaluated and shown to be useful only if helium injection is already required for window cooling.
AB - A Shack-Hartmann wavefront sensor is optimized for the study of aero-optic distortion in turbulent boundary layers at transonic and hypersonic flows. An extensive database of wavefronts, collected under a variety of flow conditions, with and without gas injection into the boundary layer, is examined. The Large Scale Motions of the outer boundary layer are found to be the aero-optically dominant structures, the Large Aperture Approximation is validated, and a new scaling argument for the rms phase distortion is proposed. The use of a combination of helium injection and low temporal bandwidth adaptive optics for the mitigation of aero-optic distortions is also evaluated and shown to be useful only if helium injection is already required for window cooling.
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M3 - Conference contribution
AN - SCOPUS:33845448261
SN - 1563478145
SN - 9781563478147
T3 - Collection of Technical Papers - 37th AIAA Plasmadynamics and Lasers Conference
SP - 208
EP - 227
BT - Collection of Technical Papers - 37th AIAA Plasmadynamics and Lasers Conference
T2 - 37th AIAA Plasmadynamics and Lasers Conference
Y2 - 5 June 2006 through 8 June 2006
ER -