Study on the reduction of aeroacoustic noise from a circular cylinder attached with cylindrical rings

• SANO Hidetoshi

  Graduate School of Science and Engineering, National Defense Academy

• YAMADA Shunsuke

  Department of Mechanical Engineering, National Defense Academy

• FUNAMI Yuki

  Department of Mechanical Engineering, National Defense Academy

• NAKAMURA Hajime

  Department of Mechanical Engineering, National Defense Academy

Bibliographic Information

Other Title

• 円筒リングを設置した円柱からの空力騒音低減に関する研究

Abstract

The reduction of aerodynamic noise emitted from a circular cylinder was investigated experimentally by attaching the cylindrical rings arranged in the axial direction of the cylinder. The Reynolds number based on the cylinder diameter d was ranged from Re = (2.0 to 3.9) × 10⁴. The sound pressure level was reduced up to 14 dB by attaching the rings of the diameter D_r/d = 1.3 and the width W/d = 1.0, which was arranged at the spanwise pitch P/d = 4. At this configuration, a 1/3 octave band analysis showed a reduction of the sound pressure up to 26 dB at the frequency band of the vortex shedding from a circular cylinder. The result of the PIV measurements showed that the reduction of the sound pressure is related to the reduction of the Reynolds stress in the wake, which is mainly caused by the suppression of the periodic vortex shedding.

Journal

• Transactions of the JSME (in Japanese)

  Transactions of the JSME (in Japanese) 86 (889), 20-00081-20-00081, 2020

  The Japan Society of Mechanical Engineers

Keywords

• Aeroacoustic noise
• Circular cylinder
• Vortex shedding
• Passive flow control
• FFT analysis

Details

• CRID: 1390567172575737472
• NII Article ID: 130007907748
• DOI: 10.1299/transjsme.20-00081
• ISSN: 21879761
• Web Site: https://www.jstage.jst.go.jp/article/transjsme/86/889/86_20-00081/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed