Abstract
A two-dimensional Shack-Hartmann wave-front sensor is used to study aero-optic distortion in turbulent boundary layers at transonic and hypersonic speeds, with and without gas injection. The large-scale motions in the outer layer, of the order of the boundary-layer thickness in size, are shown to dominate the aero-optic distortion. Gas injection always reduced the Strehl ratio, with helium injection generally giving lower Strehl ratios than nitrogen injection. The large aperture approximation is shown to be accurate for a wide variety of aberrations regardless of Mach number and gas injection. A new scaling argument for the root-mean-square phase distortion is proposed that appears to collapse the data better than previous models.
Original language | English (US) |
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Pages (from-to) | 2158-2168 |
Number of pages | 11 |
Journal | AIAA journal |
Volume | 47 |
Issue number | 9 |
DOIs | |
State | Published - Sep 2009 |
All Science Journal Classification (ASJC) codes
- Aerospace Engineering