Aero-optic distortion in transonic and hypersonic turbulent boundary layers

Christopher M. Wyckham, Alexander J. Smits

Research output: Contribution to journalArticlepeer-review

95 Scopus citations


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 languageEnglish (US)
Pages (from-to)2158-2168
Number of pages11
JournalAIAA journal
Issue number9
StatePublished - Sep 2009

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering


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