Acoustic Resonance and Vortex Shedding from Tube Banks of Boiler Plant

Hamakawa, Hiromitsu; Matsue, Hiroto; Nishida, Eiichi; Fukano, Tohru

doi:10.1299/jfst.3.805

Cited by 9 publications

(7 citation statements)

References 10 publications

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“…The acoustic natural frequency is independent of the flow velocity. A resonance phenomenon occurs at a certain velocity when the vortex shedding and acoustic natural frequencies coincide [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. When the flow velocity increases, the vortex shedding frequency suddenly locks on to the acoustic natural frequency of the duct.…”

Section: Introductionmentioning

confidence: 99%

“…They have found that dynamic lift fluctuation on the cylinders and strong in-phase vortex shedding synchronization are generated by the acoustic resonance. Thus, the self-sustained tone has been studied and the generation mechanism has been experimentally and numerically clarified [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of High Level Sound Generated in Boiler tube Bank Duct

Mori¹,

Masumoto²,

Ishihara³

2018

IJEAS

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Heat exchangers and boilers are widely used in various plants such as power plants and chemical plants. In heat exchangers and boilers, tube banks are set in a duct such that water passes through inside the tubes and warm gas outside the tubes. Due to the external flow around tube banks, the resonance phenomenon called the self-sustained tone occurs at a certain velocity. The self-sustained tone might cause noise problems in the surroundings, cause losses due to plant shutdown, etc. The self-sustained tone has been studied, and the generation mechanism has been experimentally and numerically clarified. In this paper, we have performed numerical simulations of high level sound generated in boiler tube bank duct with the flow and an acoustic simulation without the flow for a practical generation prediction of a self-sustained tone. The results show a good agreement with measurement data, and that acoustic resonance phenomenon has been numerically captured and clarified. There is the slight difference in the resonance frequencies obtained from the acoustic simulation (without the flow) by means of BEM and the CFD simulation or the experiments due to the absence or presence of the flow.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of High Level Sound Generated in Boiler tube Bank Duct

Mori¹,

Masumoto²,

Ishihara³

2018

IJEAS

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“…The structure of this apparatus is similar to that of an actual power station heat exchanger. The similarities are described in detail in the paper [15].…”

Section: Experimental Apparatus and Proceduresmentioning

confidence: 99%

“…To clarify the characteristics of the vortex shedding phenomena in the no-resonance case, the acoustic resonance generated in this model was suppressed with acoustic absorbers [15,17]. The acoustic absorbers were made of glass wool and covered by panting acrylic plates.…”

Section: Vortex Shedding Characteristicsmentioning

confidence: 99%

Effect of Arrangement of Tube Banks on Acoustic Resonance

Hamakawa¹,

Nakamura²,

Asakura³

et al. 2012

OJFD

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In the present paper the attention is focused on effect of arrangement of tube banks on acoustic resonance which occurred in the two-dimensional model of boiler. We have examined the characteristics of vortex shedding and acoustic resonance generated from in-line and staggered tube banks. At the small tube pitch ratio in in-line tube banks, acoustic resonance of third and fourth mode in the transverse direction occurred. As the tube pitch ratio in the flow direction decreased, the vortex shedding frequency became broad-band. The alternative vortex shed from in-line tube banks. The multiple resonance modes were generated within the broad-band vortex shedding frequency. And the acoustic resonances of lower-order modes occurred at the higher gap velocity. On the other hand, at the small tube pitch ratio in staggered tube banks, acoustic resonance did not occurred, although the vortex shed at the resonance frequency in tube banks. The pressure drop at staggered tube banks was larger than that of in-line tube banks. The symmetric vortices were observed inside staggered tube banks at the small tube pitch ratio.

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“…In contrast, a resonance frequency called an acoustic natural frequency, which is independent of the flow velocity, is determined by the duct size and the sound speed. When the two frequencies coincide, a resonance phenomenon occurs at a certain velocity [1][2][3][4][5][6][7][8][9]. Ziada and Oengören [10] have shown that vortex excitation results from the formation of periodic vortices in the space between tubes by visualization experiments in the waterway.…”

Section: Introductionmentioning

confidence: 99%

Countermeasure for High Level Sound Generated from Boiler Tube Bank Duct

Mori¹,

Ishihara²

2019

Noise and Vibration Control - From Theory to Practice

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Heat exchangers and boilers are widely used in various plants such as power plants and chemical plants. In the heat exchanger and the boiler, a high level sound is sometimes generated from the tube bank installed in a duct. In tube banks, warm gas flows outside of the tube, and due to the external flow around tube banks, the Karman vortex shedding occurs. At a certain frequency of the Karman vortex shedding that depends on the flow velocity, the resonance phenomenon called the self-sustained tone occurs. The self-sustained tone might cause noise problems in the surroundings, losses due to plant shutdown, etc. For suppression of the self-sustained tone, insertion of baffle plates in the tube bank is generally used. Although the insertion of baffle plates has been adopted for a long time, it is difficult to decide the effective insertion positions. On the other hand, a method using perforated plates has been proposed for the suppression of the self-sustained tones. In this chapter, we review the generation mechanism of the self-sustained tone clarified experimentally and numerically, and the methods for suppressing a self-sustained tone using baffle plates and perforated plates.

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Acoustic Resonance and Vortex Shedding from Tube Banks of Boiler Plant

Cited by 9 publications

References 10 publications

Numerical Simulation of High Level Sound Generated in Boiler tube Bank Duct

Numerical Simulation of High Level Sound Generated in Boiler tube Bank Duct

Effect of Arrangement of Tube Banks on Acoustic Resonance

Countermeasure for High Level Sound Generated from Boiler Tube Bank Duct

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