| Oscillatory Flow in Thermoacoustic Sound Wave Generator |
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| 作者姓名： | Masayasu HATAZAWA |
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| 作者单位： | Department of |
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| 摘 要： | Oscillatory flow in a thermoacoustic sound wave generator is described. The thermoacoustic sound wave generator plays an important role in thermoacoustic equipment. The heat exchange between the working fluid and the stack, the acceleration and deceleration of the working fluid and viscous friction loss both in the stack and in the resonance tube influence the performance of the thermoacoustic sound wave generator. Particularly, oscillatory flow significantly influences the heat exchange mechanism between the working fluid and the stack. Temporal changes in pressure and velocity are sinusoidal inside the resonance tube. Flow forms an oscillatory jet just behind the tube outlet, and becomes intermittent far downstream outside the resonance tube. The open-end corrections of 0.63R, that is, the region where oscillatory flow characteristics are maintained downstream in spite of being outside the tube outlet, are confirmed by velocity measurements and flow visualization. Also, they are almost equal to acoustical theoretical results.
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| 关 键 词： | 热声现象 声波发电 摆动流 热交换 |
| 收稿时间： | 10 July 2005 |
Oscillatory flow in thermoacoustic sound wave generator |
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| Masayasu HATAZAWA.Oscillatory Flow in Thermoacoustic Sound Wave Generator[J].Journal of Thermal Science,2006,15(1):92-96. |
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| Authors: | Masayasu Hatazawa |
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| Affiliation: | (1) Department of Engineering Science, Junior College of Nihon University, 7-24-1, Narashinodai, Funabashi-city, Chiba 274-8501, Japan |
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| Abstract: | Oscillatory flow in a thermoacoustic sound wave generator is described. The thermoacoustic sound wave generator plays an important role in thermoacoustic equipment. The heat exchange between the working fluid and the stack, the acceleration and deceleration of the working fluid and viscous friction loss both in the stack and in the resonance tube influence the performance of the thermoacoustic sound wave generator. Particularly, oscillatory flow significantly influences the heat exchange mechanism between the working fluid and the stack. Temporal changes in pressure and velocity are sinusoidal inside the resonance tube. Flow forms an oscillatory jet just behind the tube outlet, and becomes intermittent far downstream outside the resonance tube. The open-end corrections of 0.63R, that is, the region where oscillatory flow characteristics are maintained downstream in spite of being outside the tube outlet, are confirmed by velocity measurements and flow visualization. Also, they are almost equal to acoustical theoretical results. |
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| Keywords: | thermoacoustic phenomena sound wave generator oscillatory flow |
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