Aero-optic distortion in transonic and hypersonic turbulent boundary layers

Christopher M. Wyckham, Alexander J. Smits

Research output: Contribution to journalArticle

69 Scopus citations

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 languageEnglish (US)
Pages (from-to)2158-2168
Number of pages11
JournalAIAA journal
Volume47
Issue number9
DOIs
StatePublished - Sep 1 2009

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering

Fingerprint Dive into the research topics of 'Aero-optic distortion in transonic and hypersonic turbulent boundary layers'. Together they form a unique fingerprint.

  • Cite this