NDLI: Time dependent difference theory for sound propagation in axisymmetric ducts with plug flow

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Time dependent difference theory for sound propagation in axisymmetric ducts with plug flow

Content Provider	NASA Technical Reports Server (NTRS)
Author	Baumeister, K. J.
Copyright Year	1980
Description	The time dependent governing acoustic-difference equations and boundary conditions are developed and solved for sound propagation in an axisymmetric (cylindrical) hard wall duct with a plug mean flow and spinning acoustic modes. The analysis begins with a harmonic sound source radiating into a quiescent duct. This explicit iteration method then calculates stepwise in real time to obtain the transient as well as the 'steady' state solutions of the acoustic field. The time dependent finite difference analysis has two advantages over the steady state finite difference and finite element techniques: (1)the elimination of large matrix storage requirements, and (2)shorter solution times under most conditions.
File Size	528236
Page Count	12
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19800014607
Archival Resource Key	ark:/13960/t0rr6np3r
Language	English
Publisher Date	1980-01-01
Access Restriction	Open
Subject Keyword	Acoustics Finite Element Method Harmonic Functions Time Dependence Sound Propagation Ducts Finite Difference Theory Turbofan Engines Mach Number Axisymmetric Bodies Acoustic Impedance Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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