Zobrazeno 1 - 10
of 38
pro vyhledávání: '"Abbas Khavaran"'
Autor:
Abbas Khavaran
Publikováno v:
AIAA Journal. 57:1914-1929
The problem of propagation of sound across the shear layer in a turbofan jet exhaust with an external centerbody is discussed. The wave equation of interest is the compressible Rayleigh equation. T...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::db796c5bf746de4f94498903e854058b
https://doi.org/10.2514/1.j057723
https://doi.org/10.2514/1.j057723
Autor:
Abbas Khavaran
Publikováno v:
2018 AIAA/CEAS Aeroacoustics Conference.
The problem of propagation of sound across the shear layer in a turbofan jet exhaust with an external center-body is discussed. The wave equation of interest is compressible Rayleigh equation. Two forms of the equation are considered, and the Green's
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3784af4f794162d726da468a1c302eac
https://doi.org/10.2514/6.2018-3613
https://doi.org/10.2514/6.2018-3613
Autor:
Abbas Khavaran
Publikováno v:
International Journal of Aeroacoustics. 14:373-412
Generation of sound due to scrubbing of a jet flow past a nearby solid surface is investigated within the framework of the generalized acoustic analogy theory. The analysis applies to the boundary layer noise generated at and near a wall, and exclude
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8bc50a98879d594a039886f2d8623aea
https://doi.org/10.1260/1475-472x.14.3-4.373
https://doi.org/10.1260/1475-472x.14.3-4.373
Publikováno v:
22nd AIAA/CEAS Aeroacoustics Conference.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9016964fde634f71cc43457b12116744
https://doi.org/10.2514/6.2016-2863
https://doi.org/10.2514/6.2016-2863
Publikováno v:
International Journal of Aeroacoustics. 9:491-532
A prediction method based on the generalized acoustic analogy is presented and used to evaluate aerodynamic noise radiated from high-speed hot jets. The set of Euler equations are divided into two sets of equations that govern what may be considered
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::87678e4d5a9ad8559c76fe4f09e96a95
https://doi.org/10.1260/1475-472x.9.4-5.491
https://doi.org/10.1260/1475-472x.9.4-5.491
Publikováno v:
Noise Control Engineering Journal. 53:20-28
An investigation was conducted at the NASA Glenn Research Center using a set of three round jets operating under unheated subsonic conditions to address the question: "How close is too close?" Although sound sources are distributed at various distanc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::aa374f614441ffedda1e4c6c2aae678a
https://doi.org/10.3397/1.2839242
https://doi.org/10.3397/1.2839242
Autor:
David W. Wundrow, Abbas Khavaran
Publikováno v:
Journal of Sound and Vibration. 272:793-830
Three forms of the high-frequency asymptotic Green function for Lilley's equation are reviewed and compared to the exact solution over a wide range of Strouhal numbers. The asymmetric approximation, which applies to sources away from the jet axis, an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::de9f5cd3af12bada824fcd95b3c7b96f
https://doi.org/10.1016/s0022-460x(03)00420-6
https://doi.org/10.1016/s0022-460x(03)00420-6
Publikováno v:
50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference.
Computational fluid dynamics was used to analyze a three-stream nozzle parametric design space. The study varied bypass-to-core area ratio, tertiary-to-core area ratio and jet operating conditions. The flowfield solutions from the Reynolds-Averaged N
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4d154f4ef62112d3fad973568b0e7e72
https://doi.org/10.2514/6.2014-3741
https://doi.org/10.2514/6.2014-3741
Autor:
Abbas Khavaran
Publikováno v:
20th AIAA/CEAS Aeroacoustics Conference.
Concepts envisioned for the future of civil air transport consist of unconventional propulsion systems in the close proximity of the structure or embedded in the airframe. While such integrated systems are intended to shield noise from community, the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::998c1fcc7bf52a214bf69e75943a7cb2
https://doi.org/10.2514/6.2014-3314
https://doi.org/10.2514/6.2014-3314
Autor:
Abbas Khavaran
Publikováno v:
AIAA Journal. 37:832-841
The objective is to explore the role of anisotropy on aerodynamic mixing noise because of fine-scale turbulence. The usual assumption of isotropic turbulence is replaced with that of axisymmetric turbulence. The analysis is based on source terms of L
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b2872aa83fb125b1a765c609c4873310
https://doi.org/10.2514/2.7531
https://doi.org/10.2514/2.7531