Recent advances concerning an understanding of sound transmission through engine nozzles and jets
- Bechert, D.
- Sep 1, 1978.
- Physical Description:
- 1 electronic document
- Additional Creators:
- Dfizenmaier, E. and Michel, U.
- hdl.handle.net , Connect to this object online.
- Restrictions on Access:
- Unclassified, Unlimited, Publicly available.
Free-to-read Unrestricted online access
- 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.
- Other Subject(s):
- NASA Technical Reports Server (NTRS) Collection.
- Document ID: 19780024871.
Accession ID: 78N32814.
13-15 Sep. 1977; Berlin.
- No Copyright.
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