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Experimental studies of aero-optical properties of subsonic turbulent boundary layers

Published online by Cambridge University Press:  05 January 2014

Stanislav Gordeyev ,
Adam E. Smith ,
Jacob A. Cress  and
Eric J. Jumper
Stanislav Gordeyev*
Affiliation:
Aerospace and Mechanical Engineering Department, University of Notre Dame, Notre Dame, IN 46556, USA
Adam E. Smith
Affiliation:
Aerospace and Mechanical Engineering Department, University of Notre Dame, Notre Dame, IN 46556, USA
Jacob A. Cress
Affiliation:
Aerospace and Mechanical Engineering Department, University of Notre Dame, Notre Dame, IN 46556, USA
Eric J. Jumper
Affiliation:
Aerospace and Mechanical Engineering Department, University of Notre Dame, Notre Dame, IN 46556, USA
*
†Email address for correspondence: [email protected]
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Abstract

This paper gives the most-complete characterization to date of the optical aberrations imposed on a laser beam propagated through a subsonic, compressible, turbulent boundary layer in a zero-pressure gradient environment, over a range of boundary-layer thicknesses, oblique propagation angles and Mach numbers. This characterization is based on optical measurements using optical-wavefront-sensing instruments that have only become available in the last decade. The optical characterization includes and discusses in detail: optical-wavefront spectra, convective velocities of optically active large-scale structures and correlation functions in both streamwise and cross-stream directions, as well as root-mean-square optical path difference levels for different apertures. The scaling law based on the extended strong Reynolds analogy is derived and is shown to successfully collapse optical data collected in a number of facilities. Anisotropy of aero-optical distortions for different oblique viewing angles was experimentally quantified and is discussed.

JFM classification

Compressible Flows: Compressible boundary layers Compressible Flows: Compressible Flows
Type
Papers
Information
Journal of Fluid Mechanics , Volume 740 , 10 February 2014 , pp. 214 - 253
Copyright
© 2014 Cambridge University Press 

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