| タイトル | Fluid dynamic aspects of jet noise generation |
| 本文（外部サイト） | http://hdl.handle.net/2060/19760014116 |
| 著者（英） | Panunzio, S.; Barra, V. |
| 著者所属（英） | New York Univ. |
| 発行日 | 1976-01-31 |
| 言語 | eng |
| 内容記述 | Jet engine noise generation and noise propagation was investigated by studying supersonic nozzle flow of various nozzle configurations in an experimental test facility. The experimental facility was constructed to provide a coaxial axisymmetric jet flow of unheated air. In the test setup, an inner primary flow exhausted from a 7 in. exit diameter convergent--divergent nozzle at Mach 2, while a secondary flow had a 10 in. outside diameter and was sonic at the exit. The large dimensions of the jets permitted probes to be placed inside the jet core without significantly disturbing the flow. Static pressure fluctuations were measured for the flows. The nozzles were designed for shock free (balanced) flow at Mach 2. Data processing techniques and experimental procedures were developed in order to study induced disturbances at the edge of the supersonic flows, and the propagation of those disturbances throughout the flows. Equipment used (specifications are given) to record acoustic levels (far field noise) is described. Results and conclusions are presented and discussed. Diagrams of the jet flow fields are included along with photographs of the test stand. |
| NASA分類 | AIRCRAFT PROPULSION AND POWER |
| レポートNO | 76N21204
NASA-CR-146845 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/186415 |
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