درباره ما
NASA-TM-X-3292
Measurements of farfield sound generation from a flow-excited cavity
Year: 1975
Abstract: 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.
Subject: AERODYNAMIC
Show full item record
| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T16:53:09Z | |
| date available | 2017-09-04T16:53:09Z | |
| date copyright | 01/01/1975 | |
| date issued | 1975 | |
| identifier other | WUTKAEAAAAAAAAAA.pdf | |
| identifier uri | https://yse.yabesh.ir/std/handle/yse/116549 | |
| description abstract | 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. | |
| language | English | |
| title | NASA-TM-X-3292 | num |
| title | Measurements of farfield sound generation from a flow-excited cavity | en |
| type | standard | |
| page | 48 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1975 | |
| contenttype | fulltext | |
| subject keywords | AERODYNAMIC | |
| subject keywords | BACKGROUND | |
| subject keywords | CAVITIES | |
| subject keywords | DATA | |
| subject keywords | FAR | |
| subject keywords | FIELDS | |
| subject keywords | FLOW | |
| subject keywords | GENERATORS | |
| subject keywords | INTERNAL | |
| subject keywords | NOISE | |
| subject keywords | PRESSURE | |
| subject keywords | SOUND | |
| subject keywords | SPECTRA | |
| subject keywords | TABLES | |
| subject keywords | VELOCITY |