Computation of Shock Cell Structure of Dual-Stream Jets for Noise Prediction

Broadband shock cell noise is an important component of aircraft interior noise during cruise. At cruise, the secondary jet of most modern day jet engines is supersonic. As a result, a shock cell structure develops in the jet plume. The interaction of large turbulence structures of the jet flow and...

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Bibliographic Details
Published in:AIAA journal 2008-11, Vol.46 (11), p.2857-2867
Main Authors: Tam, Christopher K. W, Pastouchenko, Nikolai N, Viswanathan, K
Format: Article
Language:English
Subjects:
Acoustics
Aeroacoustics, atmospheric sound
Aircraft
Exact sciences and technology
Fluid dynamics
Fourier analysis
Fundamental areas of phenomenology (including applications)
Jet engines
Noise (turbulence generated)
Physics
Turbulent flow
Turbulent flows, convection, and heat transfer
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Summary:Broadband shock cell noise is an important component of aircraft interior noise during cruise. At cruise, the secondary jet of most modern day jet engines is supersonic. As a result, a shock cell structure develops in the jet plume. The interaction of large turbulence structures of the jet flow and the periodic components of the shock cells results in the emission of highly directional broadband shock cell noise. The primary objective of this investigation is to develop a computational method to calculate the shock cell structures of dual-stream jets issued from separate flow nozzles. Computation of the Fourier modes of such shock cell structures is also considered. Based on the dominant wave numbers computed by the method developed, the frequencies at the peaks of broadband shock cell noise spectra at various radiation directions are calculated. Good agreements are found with experimental measurements over a wide range of primary and secondary jet Mach numbers. The good agreements provide a validation of the accuracy of the computation method. [PUBLICATION ABSTRACT]
ISSN:0001-1452
1533-385X
DOI:10.2514/1.37045