2016 Fiscal Year Final Research Report
Improvement of prediction method of acoustic resonance in tube banks of exhaust heat recovery boiler
| Project/Area Number |
26420178
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Dynamics/Control
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| Research Institution | Oita University |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
NISHIDA Eiichi 湘南工科大学, 工学部, 教授 (70410032)
HAYASHI Hidechito 長崎大学, 工学部, 教授 (10173022)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Keywords | 流体関連振動・騒音 / 音響共鳴現象 / 渦 / 管群 / ボイラ |
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| Outline of Final Research Achievements |
We have proposed the new prediction method of acoustic resonance in tube banks of exhaust heat recovery boiler. The phase characteristics of vortex shedding were experimentally investigated in in-line tube banks. As a result, the following conclusions were obtained. The phase delay between pressure drop at measured tube and acoustic pressure on the side wall as a function of gap velocity during the occurrence of acoustic resonance. The phase decreased from about－0.5π to －π as the gap velocity increased. This value agreed well with the result of theoretical one. The acceleration feedback for the coupling condition between sound field and wake oscillator were effective. The effects of a tube vibration on Karman vortex shedding were similar to those of acoustic resonance on vortex shedding without tube vibration.
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| Free Research Field |
機械力学・制御
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