ＮＡＣＡ翼形における後流渦形成と離散周波数騒音の関係に関する実験的研究

DOI 機関リポジトリ HANDLE Web Site Web Site 被引用文献5件 参考文献12件

書誌事項

タイトル別名
  • 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

この論文をさがす

抄録

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

被引用文献 (5)*注記

もっと見る

参考文献 (12)*注記

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ