Reduction of Large Noise Generated in Boiler and Heat Exchanger by Flexible Walls

• ISHIHARA Kunihiko

  徳島文理大学保健福祉学部臨床工学科

• TAKAHASHI Takeshi

  The University of Tokushima

Bibliographic Information

Other Title

• ボイラ・熱交換器で発生する大音響騒音の柔軟壁を利用した対策法に関する研究

Abstract

Karman vortex occurs when the gas passes through the duct with tube bank of the heat exchangers, such as a gas heater and a boiler, and the very large noise called “Self-Sustained Tones” occurs due to the interaction of the vortex and the sound field in the duct. In general, baffle plates are used to suppress the self-sustained tone. However, it is difficult to use them effectively, because the insert condition is vague. We proposes that the rubber boards, flexible walls, are installed in both sides of the duct to suppress the self-sustained tones. Because we suggest the resonance of the duct perpendicular to the flow may be suppressed by rubber boards vibrating, when self sustained tones occur. The experiment was carried out to examine the suppression effect of the rubber boards installed. As a result, the suppression effect of the rubber sheet appeared when the tension of it is small and it is located at just the tube bank and downstream of the tube bank.

Journal

• TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C

  TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C 79 (802), 1837-1848, 2013

  The Japan Society of Mechanical Engineers

Keywords

• Noise Control
• Sound and Acoustics
• Natural Frequency
• Vibration Coupled with Fluid Motion
• FEM

Details

• CRID: 1390001206385835520
• NII Article ID: 130003375066
• DOI: 10.1299/kikaic.79.1837
• ISSN: 18848354
• ISSN: 03875024
• Web Site: https://www.jstage.jst.go.jp/article/kikaic/79/802/79_1837/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed