Sound transmission through jet engine nozzles and broadband - noise amplification by pure tone excitation in free jets
Abstract
The problem of sound transmission from internal sources in jet engines is discussed. The transmission path for the essential part of sound energy coincides with that of the internal flow downstream to the nozzle exit. Sound then crosses the external free jet flow on its way to the far field, and an interaction takes place between sound from internal sources and the free turbulence within the jet. Possibilities for alternating this broadband amplification are described.
- Publication:
-
Unknown
- Pub Date:
- 1977
- Bibcode:
- 1977stje.rept.....B
- Keywords:
-
- Engine Noise;
- Jet Engines;
- Nozzle Flow;
- Sound Transmission;
- Acoustic Attenuation;
- Acoustic Excitation;
- Free Jets;
- Sound Amplification;
- Acoustics