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A wind tunnel application of large-field focusing schlieren

Michael K. Ponton, John Seiner, L. Kerry Mitchell, J. C. Manning, Bernard J. Jansen, Nicholas T. Lagen

Abstract

A large-field focusing schlieren apparatus was installed in the NASA Lewis Research Center 9 by 15 foot wind tunnel in an attempt to determine the density gradient flow field of a free jet issuing from a supersonic nozzle configuration. The nozzle exit geometry was designed to reduce acoustic emissions from the jet by enhancing plume mixing. Thus, the flow exhibited a complex three-dimensional structure which warranted utilizing the sharp focusing capability of this type of schlieren method. Design considerations concerning tunnel limitations, high-speed photography, and video tape recording are presented in the paper.

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Available abstract

Key concepts: Schlieren, Schlieren photography, Supersonic wind tunnel, Wind tunnel, Nozzle, Supersonic speed, Jet (fluid), Aerospace engineering