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Mode propagation in nonuniform circular ducts with potential flow
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Cho, Y. C. Ingard, K. U. |
| Copyright Year | 1982 |
| Description | A previously reported closed form solution is expanded to determine effects of isentropic mean flow on mode propagation in a slowly converging-diverging duct, a circular cosh duct. On the assumption of uniform steady fluid density, the mean flow increases the power transmission coefficient. The increase is directly related to the increase of the cutoff ratio at the duct throat. With the negligible transverse gradients of the steady fluid variables, the conversion from one mode to another is negligible, and the power transmission coefficient remains unchanged with the mean flow direction reversed. With a proper choice of frequency parameter, many different modes can be made subject to a single value of the power transmission loss. A systematic method to include the effects of the gradients of the steady fluid variables is also described. |
| File Size | 5853026 |
| Page Count | 15 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19820007008 |
| Archival Resource Key | ark:/13960/t3kx07b4h |
| Language | English |
| Publisher Date | 1982-01-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Green's Functions Ducts Flow Characteristics Circular Cylinders Potential Flow Propagation Modes Ducted Flow Flow Equations Throats Numerical Analysis Acoustic Properties Energy Dissipation Subsonic Flow Duct Geometry Transmission Loss Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
