A Zonal Approach for Prediction of Jet Noise PDF Download
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Author: S. H. Shih
Publisher:
ISBN:
Category : Jet planes
Languages : en
Pages : 16
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Book Description
Author: S. H. Shih
Publisher:
ISBN:
Category : Jet planes
Languages : en
Pages : 16
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Book Description
Author: S. H. Shih
Publisher:
ISBN:
Category : Jet planes
Languages : en
Pages : 16
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Book Description
Author: Oleksandr Zaporozhets
Publisher: CRC Press
ISBN: 0203888820
Category : Technology & Engineering
Languages : en
Pages : 432
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Book Description
Aircraft noise has adverse impacts on passengers, airport staff and people living near airports, it thus limits the capacity of regional and international airports throughout the world. Reducing perceived noise of aircraft involves reduction of noise at source, along the propagation path and at the receiver. Effective noise control demands highly s
Author: Anthony R. Pilon
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Dominic P. Clemence
Publisher: American Mathematical Soc.
ISBN: 0821833499
Category : Mathematics
Languages : en
Pages : 226
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Book Description
Lively discussions and stimulating research were part of a five-day conference on Mathematical Methods in Nonlinear Wave Propagation sponsored by the NSF and CBMS. This volume is a collection of lectures and papers stemming from that event. Leading experts present dynamical systems and chaos, scattering and spectral theory, nonlinear wave equations, optimal control, optical waveguide design, and numerical simulation. The book is suitable for a diverse audience of mathematical specialists interested in fiber optic communications and other nonlinear phenomena. It is also suitable for engineers and other scientists interested in the mathematics of nonlinear wave propagation.
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781720664826
Category :
Languages : en
Pages : 48
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Book Description
The model-based approach, used by the JeNo code to predict jet noise spectral directivity, is described. A linearized form of Lilley's equation governs the non-causal Green s function of interest, with the non-linear terms on the right hand side identified as the source. A Reynolds-averaged Navier-Stokes (RANS) solution yields the required mean flow for the solution of the propagation Green s function in a locally parallel flow. The RANS solution also produces time- and length-scales needed to model the non-compact source, the turbulent velocity correlation tensor, with exponential temporal and spatial functions. It is shown that while an exact non-causal Green s function accurately predicts the observed shift in the location of the spectrum peak with angle as well as the angularity of sound at low to moderate Mach numbers, the polar directivity of radiated sound is not entirely captured by this Green s function at high subsonic and supersonic acoustic Mach numbers. Results presented for unheated jets in the Mach number range of 0.51 to 1.8 suggest that near the peak radiation angle of high-speed jets, a different source/Green s function convolution integral may be required in order to capture the peak observed directivity of jet noise. A sample Mach 0.90 heated jet is also discussed that highlights the requirements for a comprehensive jet noise prediction model.Khavaran, Abbas and Bridges, James and Georgiadis, NicholasGlenn Research CenterNOISE PREDICTION; TURBULENCE; JET AIRCRAFT NOISE; CONVOLUTION INTEGRALS; EXPONENTIAL FUNCTIONS; MACH NUMBER; MATHEMATICAL MODELS; SUPERSONIC SPEED
Author: R. Hixon
Publisher:
ISBN:
Category : Computational aeroacoustics
Languages : en
Pages : 32
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Book Description
Author: C. K. W. Tam
Publisher:
ISBN:
Category : Aerodynamic noise
Languages : en
Pages : 396
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Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1430
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Author: James R. Stone
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 57
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Book Description
