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Measurements of farfield sound generation from a flow-excited cavity
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Block, P. J. W. Heller, H. |
| Copyright Year | 1975 |
| Description | Results of 1/3-octave-band spectral measurements of internal pressures and the external acoustic field of a tangentially blown rectangular cavity are compared. Proposed mechanisms for sound generation are reviewed, and spectra and directivity plots of cavity noise are presented. Directivity plots show a slightly modified monopole pattern. Frequencies of cavity response are calculated using existing predictions and are compared with those obtained experimentally. The effect of modifying the upstream boundary layer on the noise was investigated, and its effectiveness was found to be a function of cavity geometry and flow velocity. |
| File Size | 1497531 |
| Page Count | 48 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19760006791 |
| Archival Resource Key | ark:/13960/t9p31nw4b |
| Language | English |
| Publisher Date | 1975-12-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Cavities Tables Data Far Fields Aerodynamic Noise Flow Velocity Sound Generators Background Noise Noise Spectra Internal Pressure 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 |
