書誌事項
- タイトル別名
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- Relationship between Wake Vortex Formation and Discrete Frequency Noise in NACA Blades.
- NACA ヨクガタ ニ オケル コウリュウ ウズ ケイセイ ト リサン シュウ
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Effects of blade thickness on discrete frequency noise (DFN) have been investigated using symmetrical NACA blades of three different thicknesses. It was clarified that the mechanism of DFN generation was different depending on the thickness of the blade. In the case of a thin blade, NACA 0008, the air flow was separated upstream of the trailing edge on the suction side of the blade, but was attached to the trailing edge of the blade on the pressure side. Therefore the frequency and the sound pressure level of DFN were varied with the variation of the attack angle. On the other hand, in the case of a thick blade, NACA 0015 or NACA 0018, the flow was separated upstream of the trailing edge on the pressure side while it was attached to the trailing edge on the suction side. The frequency and sound pressure level of DFN did not vary with the variation of the attack angle in these cases. The location of the rolling up of Karman vortices was very important in the generation of DFN. When rolling up of the Karman vortex took place far from the trailing edge of the blade, the Karman vortices did not have a strong effect on the flow around the blade. However, when Karman vortices rolled up in the vicinity of the blade, the interaction of the Karman vortices with the blade was strong, causing DFN generation.
収録刊行物
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- 日本機械学会論文集B編
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日本機械学会論文集B編 61 (586), 2109-2114, 1995
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
- 1390282680870684800
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- NII論文ID
- 110002394435
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- NII書誌ID
- AN00187441
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- ISSN
- 18848346
- 03875016
- http://id.crossref.org/issn/03875016
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- HANDLE
- 10069/22749
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- NDL書誌ID
- 3608208
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- IRDB
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可