Abstract
The behavior of a sound pulse from a simulated source in a jet is investigated both experimentally and numerically. Both approaches show that in the low and medium frequencies the far field acoustic power exhibits a marked amplification as the flow velocity increases. Experimentally this changes to an attenuation at the higher frequencies which cannot be computed by the numerical model. This amplification is traced to shear noise terms which trigger the instability waves that are inherent within the flow.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 281-301 |
| Number of pages | 21 |
| Journal | Journal of Sound and Vibration |
| Volume | 74 |
| Issue number | 2 |
| DOIs | |
| State | Published - Jan 22 1981 |
Funding
.; This work was supported under NASA Contracts No. NASI-14101 and NASl-15810 while the second and third authors were in residence at ICASE, NASA Langley Research Center, Hampton, Virginia 23665. Additional support for the third author was provided under U.S. Air Force Office of Scientific Research Contract No. AFOSR-76-288 1.
ASJC Scopus subject areas
- Condensed Matter Physics
- Mechanics of Materials
- Acoustics and Ultrasonics
- Mechanical Engineering