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Finite-difference theory for sound propagation in a lined duct with uniform flow using the wave envelope concept
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Baumeister, K. J. |
| Copyright Year | 1977 |
| Description | Finite difference equations are derived for sound propagation in a two dimensional, straight, soft wall duct with a uniform flow by using the wave envelope concept. This concept reduces the required number of finite difference grid points by one to two orders of magnitude depending on the length of the duct and the frequency of the sound. The governing acoustic difference equations in complex notation are derived. An exit condition is developed that allows a duct of finite length to simulate the wave propagation in an infinitely long duct. Sample calculations presented for a plane wave incident upon the acoustic liner show the numerical theory to be in good agreement with closed form analytical theory. Complete pressure and velocity printouts are given to some sample problems and can be used to debug and check future computer programs. |
| File Size | 2085679 |
| Page Count | 67 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19770023964 |
| Archival Resource Key | ark:/13960/t0ms8hn6z |
| Language | English |
| Publisher Date | 1977-08-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Sound Propagation Continuity Equation Finite Difference Theory Runge-kutta Method Momentum Uniform Flow Acoustic Ducts Two Dimensional Flow Sound Pressure Cartesian Coordinates Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
