NDLI: Effect of swirl on turbulent structures in supersonic jets (Document No: 19980237958)

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Effect of swirl on turbulent structures in supersonic jets (Document No: 19980237958)

Content Provider	NASA Technical Reports Server (NTRS)
Author	Lundgren, Thomas S. Rao, Ram Mohan
Copyright Year	1998
Description	Direct numerical simulation (DNS) is used to study the mechanism of generation and evolution of turbulence structures in a temporally evolving supersonic swirling round jet and also to examine the resulting acoustic radiations. Fourier spectral expansions are used in the streamwise and azimuthal directions and a 1-D b-spline Galerkin representation is used in the radial direction. Spectral-like accuracy is achieved using this numerical scheme. Direct numerical simulations, using the b-spline spectral method, are carried out starting from mean flow initial conditions which are perturbed by the most unstable linear stability eigenfunctions. It is observed that the initial.helical instability waves evolve into helical vortices which eventually breakdown into smaller scales of turbulence. 'Rib' structures similar to those seen in incompressible mixing layer flow of Rogers and Moser are observed. The jet core breakdown stage exhibits increased acoustic radiations.
File Size	861633
Page Count	29
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19980237958
Archival Resource Key	ark:/13960/t6644pc3v
Language	English
Publisher Date	1998-03-01
Access Restriction	Open
Subject Keyword	Fluid Mechanics And Heat Transfer Gas Jets Incompressible Flow Sound Waves Turbulence Turbulent Flow Direct Numerical Simulation Vortices Supersonic Jet Flow Eigenvectors Galerkin Method Mixing Layers Fluids Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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