Acoustic Resonance and Vortex Shedding from Tube Banks of Boiler Plant

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概要

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• This paper focuses on the relationship between acoustic resonance and vortex shedding from the tube banks of a boiler plant. We have built a model similar to the actual boiler plant to clarify the characteristics of acoustic resonance phenomena and vortex shedding. The model used in-line tube banks with a small tube pitch ratio. We examined the relationship between the acoustic resonance of the actual plant and that of the model, and measured the sound pressure level, acoustic pressure mode shape, spectrum of velocity fluctuation, and gap velocity. Gap velocity was defined as the mean velocity in the smallest gaps between two neighboring tubes in the transverse direction. As a result, the resonant frequencies and mode shapes of the acoustic resonances in the actual boiler plant agreed well with those in the similar model. We found many peak frequencies in the sound pressure level spectrum when acoustic resonances occurred. The typical Strouhal numbers at the onset velocity of acoustic resonances were about 0.19, 0.26 and 0.52. Periodic velocity fluctuation caused by vortex shedding was observed inside the tube banks without acoustic resonance. The Strouhal number measured for vortex shedding was 0.15. Acoustic resonances of higher-order modes were generated in this plant.

• 一般社団法人 日本機械学会の論文

著者

• HAMAKAWA Hiromitsu

  Department of Mechanical Engineering, Oita University

• Fukano Tohru

  Department Of Environmental Symbiosis Engineering Kurume Institute Of Technology

• Nishida Eiichi

  Department Of Mechanical Engineering Shonan Institute Of Technology

• MATSUE Hiroto

  Graduate Student, Oita University

関連論文

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• Effect of Flow Induced Acoustic Resonance on Vortex Shedding from Staggered Tube Banks
• VORTEX SHEDDING IN NORMAL TRIANGULAR TUBE ARRAYS WITH CLOSELY MOUNTED TWIST SERRATED FIN(Flow around Cylinder 2)
• Effects of the Tip Clearance on Vortical Flow and Its Relation to Noise in an Axial Flow Fan
• Air-Water Two-Phase Annular Flow in Near-Horizontal Tubes (Effect of Pipe Inclination on the Fundamental Parameters)
• Hydrodynamic Force between Slightly Deformable Bubbles at Low Reynolds Number
• Acoustic Resonance and Vortex Shedding from Tube Banks of Boiler Plant
• Vortex Shedding from a Circular Cylinder with Spiral Fin

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