منابع مشابه
Nonlinear interaction model of subsonic jet noise.
Noise generation in a subsonic round jet is studied by a simplified model, in which nonlinear interactions of spatially evolving instability modes lead to the radiation of sound. The spatial mode evolution is computed using linear parabolized stability equations. Nonlinear interactions are found on a mode-by-mode basis and the sound radiation characteristics are determined by solution of the Li...
متن کاملStability of Subsonic Jet Flows
An overview of recent experimental results on instability and dynamics of jets at low Reynolds numbers is given. Round and plane, macro and micro jets are under the consideration. Basic features of their evolution affected by initial conditions at the nuzzle outlet and environmental perturbations are demonstrated.
متن کاملDownstream subsonic jet noise: link with vortical structures intruding into the jet core
A subsonic circular jet with a Mach number of 0.9 and a Reynolds number of 65 000 is computed by a compressible Large Eddy Simulation (LES) to determine both the flow field and the sound field in the same calculation. The noise radiated by the jet, provided by LES, is in good agreement with experimental data of the literature in terms of sound pressure spectra, levels and directivity, showing t...
متن کاملNoise prediction of a subsonic turbulent round jet using the lattice-Boltzmann method.
The lattice-Boltzmann method (LBM) was used to study the far-field noise generated from a Mach, M(j)=0.4, unheated turbulent axisymmetric jet. A commercial code based on the LBM kernel was used to simulate the turbulent flow exhausting from a pipe which is 10 jet radii in length. Near-field flow results such as jet centerline velocity decay rates and turbulence intensities were in agreement wit...
متن کاملDirect numerical simulation of a temporally-developing subsonic round jet and its sound field
A temporally-developing isothermal round jet at a Mach number of 0.9 and a diameterbased Reynolds number of 3125 is computed by direct numerical simulations in order to investigate its turbulent development and its generated noise. The simulations are performed using high-order finite differences on a grid of 940 million points extending up to 120 jet radii in the axial direction. Snapshots and...
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ژورنال
عنوان ژورنال: The Journal of the Acoustical Society of America
سال: 1973
ISSN: 0001-4966
DOI: 10.1121/1.1982368