| Multi-scale and multi-fractal analysis of pressure fluctuation in slurry bubble column bed reactor |
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| 作者姓名： | 王兴军 胡立舜 沈军杰 余志楠 王辅臣 于遵宏 |
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| 作者单位： | Institute of Clean Coal Technology East China University of Science and Technology，Institute of Clean Coal Technology East China University of Science and Technology，Institute of Clean Coal Technology East China University of Science and Technology，Institute of Clean Coal Technology East China University of Science and Technology，Institute of Clean Coal Technology East China University of Science and Technology，Institute of Clean Coal Technology East China University of Science and Technology，Shanghai 200237 China，Shanghai 200237 China，Shanghai 200237 China，Shanghai 200237 China，Shanghai 200237 China，Shanghai 200237 China |
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| 基金项目： | 教育部跨世纪优秀人才培养计划 |
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| 摘 要： | The Daubechies second order wavelet was applied to decompose pressure fluctuation signals with the gas flux varying from 0.18 to 0.90 m3/h and the solid mass fraction from 0 to 20% and scales 1?9 detail signals and the 9th scale approximation signals. The pressure signals were studied by multi-scale and R/S analysis method. Hurst analysis method was applied to analyze multi-fractal characteristics of different scale signals. The results show that the characteristics of mono-fractal under scale 1 and scale 2, and bi-fractal under scale 3?9 are effective in deducing the hydrodynamics in slurry bubbling flow system. The measured pressure signals are decomposed to micro-scale signals, meso-scale signals and macro-scale signals. Micro-scale and macro-scale signals are of mono-fractal characteristics, and meso-scale signals are of bi-fractal characteristics. By analyzing energy distribution of different scale signals,it is shown that pressure fluctuations mainly reflects meso-scale interaction between the particles and the bubble.
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| 关 键 词： | R/S分析 气泡 反应堆 计算机 |
| 收稿时间： | 26 February 2007 |
| 修稿时间： | 2007-02-26 |
Multi-scale and multi-fractal analysis of pressure fluctuation in slurry bubble column bed reactor |
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| Wang Xing-jun , Hu Li-shun , Shen Jun-jie , Yu Zhi-nan , Wang Fu-chen and Yu Zun-hong.Multi-scale and multi-fractal analysis of pressure fluctuation in slurry bubble column bed reactor[J].Journal of Central South University of Technology,2007,14(5):696-700. |
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| Authors: | Wang Xing-jun Hu Li-shun Shen Jun-jie Yu Zhi-nan Wang Fu-chen and Yu Zun-hong |
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| Affiliation: | Institute of Clean Coal Technology, East China University of Science and Technology, Shanghai 200237, China |
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| Abstract: | The Daubechies second order wavelet was applied to decompose pressure fluctuation signals with the gas flux varying from 0.18 to 0.90 m3/h and the solid mass fraction from 0 to 20% and scales 1?9 detail signals and the 9th scale approximation signals. The pressure signals were studied by multi-scale and R/S analysis method. Hurst analysis method was applied to analyze multi-fractal characteristics of different scale signals. The results show that the characteristics of mono-fractal under scale 1 and scale 2, and bi-fractal under scale 3?9 are effective in deducing the hydrodynamics in slurry bubbling flow system. The measured pressure signals are decomposed to micro-scale signals, meso-scale signals and macro-scale signals. Micro-scale and macro-scale signals are of mono-fractal characteristics, and meso-scale signals are of bi-fractal characteristics. By analyzing energy distribution of different scale signals,it is shown that pressure fluctuations mainly reflects meso-scale interaction between the particles and the bubble. |
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| Keywords: | pressure fluctuation R/S analysis multi-scale multi-fractal bubble column bed reactor |
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