Actions for Application of Time-resolved PIV to Supersonic Hot Jets

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Application of Time-resolved PIV to Supersonic Hot Jets

Author
Wernet, Mark P.
Published
October 30, 2007.
Physical Description
1 electronic document
Additional Creators
Bridges, James
Online Version

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Unclassified, Unlimited, Publicly available.
Free-to-read Unrestricted online access
Summary
This presentation lays out the ground-breaking work at bringing high-speed (25kHz) particle image velocimetry (PIV) to bear on measurements of noise-producing turbulence in hot jets. The work is still in progress in that the tremendous amount of data obtained are still be analyzed, but the method has been validated and initial results of interest to jet noise modeling have been obtained. After a brief demonstration of the validation process used on the data, results are shown for hot jets at different temperatures and Mach numbers. Comparisons of first order statistics show the relative indifference of the turbulence to the presence of shocks and independence to jet temperature. What does come out is that when the shock-containing jets are in a screech mode the turbulence is highly elevated, showing the importance of removing screech phenomena from model-scale jets before applying findings to full-scale aircraft which typically do not contain shocks.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 20080012555.
NASA Aeronautics Research Mission Directorate Annual Meeting; 30 Oct. -1 Nov. 2007; New Orleans, LA; United States.
Terms of Use and Reproduction
No Copyright.
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