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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781721009305
Category :
Languages : en
Pages : 54
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Book Description
Noise radiated from a supersonic jet is computed using the Parabolized Stability Equations (PSE) method. The evolution of the instability waves inside the jet is computed using the PSE method and the noise radiated to the far field from these waves is calculated by solving the wave equation using the Fourier transform method. We performed the computations for a cold supersonic jet of Mach number 2.1 which is excited by disturbances with Strouhal numbers St=.2 and .4 and the azimuthal wavenumber m=l. Good agreement in the sound pressure level are observed between the computed and the measured (Troutt and McLaughlin 1980) results.Balakumar, P. and Owis, FaroukLangley Research CenterJET AIRCRAFT NOISE; SUPERSONIC JET FLOW; SUBSONIC FLOW; STABILITY; FAR FIELDS; WAVE EQUATIONS; FOURIER TRANSFORMATION; SOUND PRESSURE; COLD GAS; STROUHAL NUMBER; AZIMUTH
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781721009305
Category :
Languages : en
Pages : 54
Get Book Here
Book Description
Noise radiated from a supersonic jet is computed using the Parabolized Stability Equations (PSE) method. The evolution of the instability waves inside the jet is computed using the PSE method and the noise radiated to the far field from these waves is calculated by solving the wave equation using the Fourier transform method. We performed the computations for a cold supersonic jet of Mach number 2.1 which is excited by disturbances with Strouhal numbers St=.2 and .4 and the azimuthal wavenumber m=l. Good agreement in the sound pressure level are observed between the computed and the measured (Troutt and McLaughlin 1980) results.Balakumar, P. and Owis, FaroukLangley Research CenterJET AIRCRAFT NOISE; SUPERSONIC JET FLOW; SUBSONIC FLOW; STABILITY; FAR FIELDS; WAVE EQUATIONS; FOURIER TRANSFORMATION; SOUND PRESSURE; COLD GAS; STROUHAL NUMBER; AZIMUTH
Author: Stanford University. Thermosciences Division. Thermosciences Division
Publisher:
ISBN:
Category : Aerodynamic noise
Languages : en
Pages : 312
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Book Description
Author: Ganesh Raman
Publisher: Multi-Science Publishing Company
ISBN:
Category : Science
Languages : en
Pages : 584
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Book Description
An up-to-date survey of airplane noise, this single-volume reference thoroughly addresses the key problems facing aeronautical engineers. By tackling the most important aspects of jet aeroacoustics, including theories of jet noise, the design of jet noise facilities, and how jet noise is measured, this thoroughly researched analysis outlines a plan for first limiting the current distress being vocalized in issues of passenger cabin comfort and protests by those living near airports and later for finding an overall solution to jet noise.
Author: Farouk Owis
Publisher:
ISBN:
Category : Acoustical engineering
Languages : en
Pages : 322
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Book Description
Author:
Publisher:
ISBN:
Category : Jet planes
Languages : en
Pages : 694
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 75
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Book Description
Three analytical models for near field noise calculation are formulated for subsonic and supersonic jet flows. Evaluation of these models in comparison with nearfield noise measurements from a full scale jet engine and scale model hot jets is presented. The use of compositions of different quadrupoles as prediction models is demonstrated. The effect of initial turbulence level on the near noise field was studied by the use of the analytical models. The results of the study indicate that an increase of the turbulence level in the jet exit plane causes an increase in sound pressure level for high frequencies. The effect of the turbulence level is negligible for low frequency sound. (Author).
Author:
Publisher:
ISBN:
Category : Jet planes
Languages : en
Pages : 50
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Book Description
Author:
Publisher:
ISBN:
Category : Jet planes
Languages : en
Pages : 52
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Book Description
Author: Christophe Bailly
Publisher:
ISBN:
Category :
Languages : en
Pages : 16
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Book Description
Author: Rainer Friedrich
Publisher: Springer Science & Business Media
ISBN: 9781402020322
Category : Science
Languages : en
Pages : 676
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Book Description
The fifth ERCOFfAC workshop 'Direct and Large-Eddy Simulation-5' (DLES-5) was held at the Munich University of Technology, August 27-29, 2003. It is part of a series of workshops that originated at the University of Surrey in 1994 with the intention to provide a forum for presentation and dis cussion of recent developments in the field of direct and large-eddy simula tion. Over the years the DLES-series has grown into a major international venue focussed on all aspects of DNS and LES, but also on hybrid methods like RANSILES coupling and detached-eddy simulation designed to provide reliable answers to technical flow problems at reasonable computational cost. DLES-5 was attended by 111 delegates from 15 countries. Its three-day pro gramme covered ten invited lectures and 63 original contributions partially pre sented in parallel sessions. The workshop was financially supported by the fol lowing companies, institutions and organizations: ANSYS Germany GmbH, AUDI AG, BMW Group, ERCOFfAC, FORTVER (Bavarian Research Asso ciation on Combustion), JM BURGERS CENTRE for Fluid Dynamics. Their help is gratefully acknowledged. The present Proceedings contain the written versions of nine invited lectures and fifty-nine selected and reviewed contributions which are organized in four parts: 1 Issues in LES modelling and numerics 2 Laminar-turbulent transition 3 Turbulent flows involving complex physical phenomena 4 Turbulent flows in complex geometries and in technical applications.
