| タイトル | Turbofan noise generation. Volume 1: Analysis |
| 本文（外部サイト） | http://hdl.handle.net/2060/19830006770 |
| 著者（英） | Mark, W. D.; Ventres, C. S.; Theobald, M. A. |
| 著者所属（英） | Bolt, Beranek, and Newman, Inc. |
| 発行日 | 1982-07-01 |
| 言語 | eng |
| 内容記述 | Computer programs were developed which calculate the in-duct acoustic modes excited by a fan/stator stae operating at subsonic tip speed. Three noise source mechanisms are included: (1) sound generated by the rotor blades interacting with turbulence ingested into, or generated within, the inlet duct; (2) sound generated by the stator vanes interacting with the turbulent wakes of the rotors blades; and (3) sound generated by the stator vanes interacting with the mean velocity deficit wakes of the rotor blades. The fan/stator stage is modeled as an ensemble of blades and vanes of zero camber and thickness enclosed within an infinite hard-walled annular duct. Turbulence drawn into or generated within the inlet duct is modeled as nonhomogeneous and anisotropic random fluid motion, superimposed upon a uniform axial mean flow, and convected with that flow. Equations for the duct mode amplitudes, or expected values of the amplitudes, are derived. |
| NASA分類 | ACOUSTICS |
| レポートNO | 83N15041
NAS 1.26:167951
REPT-4770
NASA-CR-167951 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/163943 |
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