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Transmission of thin light beams through turbulent mixing layers

Wissler, John B. and Roshko, Anatol (1992) Transmission of thin light beams through turbulent mixing layers. In: 30th AIAA Aerospace Sciences Meeting, January 6-9, 1992, Reno, NV.

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This research investigates the effects of spanwise and streamwise coherent structures in a turbulent mixing layer on the deflection of a thin light beam which is transmitting transversely through the mixing layer from the high-speed side to the low speed side. Both equal and unequal density mixing layers of varying pressures and velocities are studied, using a lateral effect detector to dynamically track the motion of a He-Ne laser beam. Beam deflections in the streamwise direction are found to be associated mainly with the spanwise coherent structures; at low Reynolds Numbers the beam deflection is directly related to the part of a spanwise structure through which the beam passes. Maximum deflections are associated with the trailing edge of the spanwise coherent structures. Spanwise deflections are caused mainly by the streamwise coherent structures and as such exhibit large variations across the span of the flow. With the development of the streamwise structures, spanwise deflections are found to exceed streamwise deflections. Mixing transition, as scaled using the momentum thickness of the high-speed side, is found to cause a peak in therms fluctuations of both the streamwise and spanwise deflections.

Item Type:Conference or Workshop Item (Paper)
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Additional Information:© 1992 AIAA. This research was supported by the Air Force Office of Scientific Research and Phillips Laboratory under AFOSR Grant No. AFOSR-89-0552. We wish to thank Professors Donald Coles and Bradford Sturtevant for crucial suggestions for the experimental techniques.
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Air Force Office of Scientific Research (AFOSR)AFOSR-89-0552
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AIAA Paper92-0658
Record Number:CaltechAUTHORS:20141210-134738343
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Official Citation:Transmission of thin light beams through turbulent mixing layers JOHN WISSLER and ANATOL ROSHKO 30th Aerospace Sciences Meeting and Exhibit. January 1992
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:52559
Deposited By: George Porter
Deposited On:10 Dec 2014 22:08
Last Modified:10 Nov 2021 19:42

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