Experimental Study of Flight Effect on Fan Noise : 2nd, Report, Fan Noise Variations due to Flight Effect
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説明
Clarification of fan noise source variation due to a flight effect is important for a turbofan noise reduction and a noise estimation. A fan noise spectral extent and a range of fan operation influenced by the flight effect were studied experimentally using a large turbofan engine and a geodesic 4m diameter semi-sphere inflow control device that can simulate the flight effect on fan noise in static engine tests. The fan noise reduction by the flight effect in a fan approach condition was higher than that in a fan take-off condition, because the fan rotor generates BPF tones by itself near the take-off condition. The highest reduced component in fan noise spectra was a fundamental fan blade passing frequency (BPF) tone, whose reduced level was 20 dB at maximum. Higher harmonic BPF tones and a buzz saw noise were also reduced by the flight effect, but a reduction of broadband noise was not evaluated in the whole range of fan operation.
収録刊行物
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- Bulletin of JSME
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Bulletin of JSME 29 (255), 2909-2916, 1986
一般社団法人 日本機械学会
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詳細情報 詳細情報について
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- CRID
- 1390282681469308544
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- NII論文ID
- 110002364193
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- NII書誌ID
- AA0058509X
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- ISSN
- 18811426
- 00213764
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可