| タイトル | An experimental study of sound radiation from a subsonic jet in simulated motion |
| 著者（英） | Yu, J. C.; Dixon, N. R. |
| 著者所属（英） | Joint Inst. for Advancement of Flight Sciences|NASA Langley Research Center |
| 発行日 | 1979-01-01 |
| 言語 | eng |
| 内容記述 | A free-jet anechoic facility is used for quantitative determination of the effect of motion on the pure jet mixing noise from subsonic jets. The farfield measurements obtained outside the free jet are subjected to amplitude and angle corrections due to free-jet shear layer refraction; in addition, corrections are made to account for the distributed nature of the jet noise source as a function of frequency. The corrected results, which provide the changes in the jet mixing noise as a result of simulated jet motion, are presented for a range of jet velocities with a fixed free-jet velocity. Comparisons are made between the findings obtained and those related to other simulation and flight measurements. The results indicate that the effect of motion is to reduce jet mixing noise at all angles of measurement, and the reduction is broadband with the largest magnitude occurring around the spectral peak. |
| NASA分類 | ACOUSTICS |
| レポートNO | 79A19584
AIAA PAPER 79-0185 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/428840 |
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