Email RIS file
Bookmark
Report an Issue

Supersonic jet noise generated by large scale instabilities

Author
Mclaughlin, D. K.
Published
Sep 1, 1982.
Physical Description
1 electronic document
Additional Creators
Seiner, J. M. and Liu, C. H.
Online Version

Availability

I Want It
I Want It

Finding items...

Restrictions on Access
Unclassified, Unlimited, Publicly available.
Free-to-read Unrestricted online access
Summary
The role of large scale wavelike structures as the major mechanism for supersonic jet noise emission is examined. With the use of aerodynamic and acoustic data for low Reynolds number, supersonic jets at and below 70 thousand comparisons are made with flow fluctuation and acoustic measurements in high Reynolds number, supersonic jets. These comparisons show that a similar physical mechanism governs the generation of sound emitted in he principal noise direction. These experimental data are further compared with a linear instability theory whose prediction for the axial location of peak wave amplitude agrees satisfactorily with measured phased averaged flow fluctuation data in the low Reynolds number jets. The agreement between theory and experiment in the high Reynolds number flow differs as to the axial location for peak flow fluctuations and predicts an apparent origin for sound emission far upstream of the measured acoustic data.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19820026313.
Accession ID: 82N34189.
NAS 1.60:2072.
L-15307.
NASA-TP-2072.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15714694