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Recent advances concerning an understanding of sound transmission through engine nozzles and jets
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Michel, U. Bechert, D. Dfizenmaier, E. |
| Copyright Year | 1978 |
| Description | Experiments on the interaction between a turbulent jet and pure tone sound coming from inside the jet nozzle are reported. This is a model representing the sound transmission from sound sources in jet engines through the nozzle and the jet flow into the far field. It is shown that pure tone sound at low frequencies is considerably attenuated by the jet flow, whereas it is conserved at higher frequencies. On the other hand, broadband jet noise can be amplified considerably by a pure tone excitation. Both effects seem not to be interdependent. Knowledge on how they are created and on relevant parameter dependences allow new considerations for the development of sound attenuators. |
| File Size | 1475614 |
| Page Count | 24 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19780024871 |
| Archival Resource Key | ark:/13960/t91883k1q |
| Language | English |
| Publisher Date | 1978-09-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Amplification Wave Attenuation Exhaust Nozzles Jet Flow Broadband Sound Transmission Far Fields High Frequencies Low Frequencies Turbulent Jets Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
