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Whole-Field Measurements of Turbulent Flows for the Study of Aero-Optical Effects

Fourguette, D. C. and Dimotakis, P. E. and Ching, W. K. (1996) Whole-Field Measurements of Turbulent Flows for the Study of Aero-Optical Effects. California Institute of Technology , Pasadena, CA. (Unpublished)

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Planar laser-Rayleigh scattering has been employed to simultaneously image the index-of-refraction field of a turbulent jet of ethylene into nitrogen and the optical degradation of a laser sheet caused by this turbulent-flow field. The optical degradation occurs in t he turbulent-jet region and manifests itself as phase-front tilts that result in a measurable spatial amplitude modulation (streaks) in the emerging pulsed-laser sheet. The experiments were conducted at elevated pressure, increasing the index-of-refract ion gradient s and improving the signal-to-noise ratio over measurements conducted at atmospheric pressure. The high index-of-refraction gradients in these experiments placed the optical far field within the field of view and allowed us to capture caustic formation in the distorted emerging laser sheet, simulating the aero-optics effects expected at large distances from the smaller index-of-refract ion fluctuations one would more typically encounter.

Item Type:Report or Paper (Technical Report)
Additional Information:© 1996 California Institute of Technology. This work was sponsored by the Air Force Office of Scientific Research, under Grant No. F49620-94-1-0283.
Group:Graduate Aeronautical Laboratories (Fluid Mechanics), GALCIT
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Air Force Office of Scientific Research (AFOSR)F49620-94-1-0283
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Record Number:CaltechAUTHORS:20141111-112204021
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51578
Deposited On:11 Nov 2014 19:35
Last Modified:17 Nov 2021 17:36

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