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Theory of low frequency noise transmission through turbines
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Mani, R. Matta, R. K. |
| Copyright Year | 1979 |
| Description | Improvements of the existing theory of low frequency noise transmission through turbines and development of a working prediction tool are described. The existing actuator-disk model and a new finite-chord model were utilized in an analytical study. The interactive effect of adjacent blade rows, higher order spinning modes, blade-passage shocks, and duct area variations were considered separately. The improved theory was validated using the data acquired in an earlier NASA program. Computer programs incorporating the improved theory were produced for transmission loss prediction purposes. The programs were exercised parametrically and charts constructed to define approximately the low frequency noise transfer through turbines. The loss through the exhaust nozzle and flow(s) was also considered. |
| File Size | 5251191 |
| Page Count | 160 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19790011946 |
| Archival Resource Key | ark:/13960/t6741kd37 |
| Language | English |
| Publisher Date | 1979-03-01 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Propulsion And Power Sound Waves Turbine Blades Engine Noise Noise Reduction Data Acquisition Acoustic Propagation Low Frequencies Turbines Turbine Exhaust Nozzles Computer Programs 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 |
