| タイトル | Application of the Bernoulli enthalpy concept to the study of vortex noise and jet impingement noise |
| 本文（外部サイト） | http://hdl.handle.net/2060/19780014918 |
| 著者（英） | Yates, J. E. |
| 著者所属（英） | Aeronautical Research Associates of Princeton, Inc. |
| 発行日 | 1978-04-01 |
| 言語 | eng |
| 内容記述 | A complete theory of aeroacoustics of homentropic fluid media is developed and compared with previous theories. The theory is applied to study the interaction of sound with vortex flows, for the DC-9 in a standard take-off configuration. The maximum engine-wake interference noise is estimated to be 3 or 4 db in the ground plane. It is shown that the noise produced by a corotating vortex pair departs significantly from the compact M scaling law for eddy Mach numbers (M) greater than 0.1. An estimate of jet impingement noise is given that is in qualitative agreement with experimental results. The increased noise results primarily from the nonuniform acceleration of turbulent eddies through the stagnation point flow. It is shown that the corotating vortex pair can be excited or de-excited by an externally applied sound field. The model is used to qualitatively explain experimental results on excited jets. |
| NASA分類 | ACOUSTICS |
| レポートNO | 78N22861
NASA-CR-2987 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/179011 |
