Elucidation of fan noises using high-precision numerical prediction and multiple acoustic mode control experiments of fan noises

2013 Fiscal Year Final Research Report

• Project/Area Number: 23560955
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Aerospace engineering
• Research Institution: Kyushu University
• Principal Investigator: YAMASAKI Nobuhiko 九州大学, 工学(系)研究科(研究院), 教授 (70166635)
• Co-Investigator(Kenkyū-buntansha): INOKUCHI Yuzo 九州大学, 大学院工学研究院, 准助教 (30274509)
• Project Period (FY): 2011 – 2013
• Keywords: ファン騒音 / トーンノイズ / 能動制御 / ANC / モード解析 / 線形非定常 / 翼列

Research Abstract

Effects of the lean (circumferential inclination angle), the distance from the rotor blades, the sweep (axial inclination angle) of the stator vanes downstream of the rotor blade of a fan on fan noise reduction were elucidated by the numerical calculation based on the unsteady Reynolds-averaged Navier-Stokes (URANS) equations. It was shown all geometric parameters can be effective in the noise reduction, together with the physical reasoning.
As far as the active suppression of fan noise using the model fan setup is concerned, the sound source which can generate multiple sound modes was developed, the filtered-x LMS algorithm in the frequency domain was introduced, and the automatic control of the multiple modes was enabled to be realized.

Research Products

• [Journal Article] モード解析を用いたダクトファンのアクティブ消音 (2013)
  • Author(s): 長井健一郎, 鈴木優太郎, 猪口雄三, 生沼秀司, 石井達哉, 山崎伸彦
  • Journal Title: 日本機械学会論文集B編 Volume: 第79巻,第801号 Pages: 739-743
  • Peer Reviewed
• [Journal Article] ファン騒音の能動制御 (2012)
  • Author(s): 鈴木優太郎, 猪口雄三, 山崎伸彦
  • Journal Title: ターボ機械 Volume: 第40巻,第4号 Pages: 226–233
  • Peer Reviewed
• [Presentation] Noise Prediction and Suppression from Aircraft Engines (2013)
  • Author(s): Nobuhiko Yamasaki
  • Organizer: Proceedings of 7th Asian-Pacific Conference on Aerospace Technology and Sciences, (APCATS)
  • Year and Date: 20130000
  • Invited
• [Presentation] Fan Noise Prediction Using Unsteady CFD Analysis and Modal Decomposition (2013)
  • Author(s): Nobuhiko Yamasaki, Daijiro Shiraiwa and YunTae Lee
  • Organizer: Proceedings of 21st International Symposium on Air Breathing Engines (ISABE)
  • Place of Presentation: (ISABE-2013-1316, CD-ROM)
  • Year and Date: 20130000
• [Presentation] Experiments on Adaptive Anti-Noise Control for Fan Noises (2012)
  • Author(s): Yutaro Suzuki, Kenichiro Nagai, Yuzo Inokuchi, Takuya Ishii, Hideshi Oinuma, and Nobuhiko Yamasaki
  • Organizer: Proceedings of The 13^<th> International Symposium on Unsteady Aerodynamics, Aeroacoustics, and Aeroelasticity of Turbomachines
  • Place of Presentation: (ISUAAAT13-S12-6, CD-ROM)
  • Year and Date: 20120000
• [Presentation] Active Control of Fan Noise at Various Rotational Speeds (2011)
  • Author(s): Nobuhiko Yamasaki, Yutaro Suzuki, Takeshi Nakagawa and Yuzo Inokuchi
  • Organizer: Proceedings of 20^<th> International Symposium on Air Breathing Engines (ISABE)
  • Place of Presentation: (ISABE-2011-1413, CD-ROM)
  • Year and Date: 20110000
• [Remarks] ホームページ
  • URL: http://www.aero.kyushu-u.ac.jp/apl/