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Correlation of flight effects on centerline velocity decay for cold-flow acoustically excited jetsAcoustic excitation can influence the large scale shear layer structure of jet flow, thereby causing the jet centerline velocity to decay more rapidly. this phenomena has numerous practical applications, such as the reduction of jet/flap impingement velocity in order to reduce flap structural loads for under-the-wing STOL aircraft concepts. Cold flow centerline velocity decay data obtained with acoustic excitation of the jet exhaust flow are correlated with and without flight effects. Initially, static data are correlated in terms of an acoustic parameter involving the threshold sound level needed to initiate acoustic excitation of the jet plume. It is shown that for a given flight speed, the same acoustic excitation parameter as that developed for the static condition is valid. Finally, an aerodynamic flight effects parameter is included to correlate the static and flight centerline velocity decay data with and without acoustic excitation.
Document ID
19840003815
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Vonglahn, U. H. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 4, 2013
Publication Date
January 1, 1982
Subject Category
Acoustics
Report/Patent Number
NAS 1.15:83502
E-1842
NASA-TM-83502
Meeting Information
Meeting: Meeting of the Acoustical Soc. of Am.
Location: San Diego, CA
Country: United States
Start Date: November 7, 1983
End Date: November 11, 1983
Accession Number
84N11883
Funding Number(s)
PROJECT: RTOP 505-31-32
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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