| 垂直上升管泡状流压力波动的多尺度分析 |
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| 引用本文： | 白博峰,陈学俊.垂直上升管泡状流压力波动的多尺度分析[J].工程热物理学报,2004,25(3):427-430. |
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| 作者姓名： | 白博峰 陈学俊 |
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| 作者单位： | 西安交通大学动力工程多相流国家重点实验室,陕西,西安,710049;西安交通大学动力工程多相流国家重点实验室,陕西,西安,710049 |
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| 基金项目： | 国家自然科学基金(No.50006010)，973项目资助(No.G1999022308)，博士点基金(No.20030698036) |
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| 摘 要： | 从理想的单气泡运动物理模型和离散正交小波与统计相结合的信号处理技术研究了泡状流压力波动的机理与多尺度时频规律,得到以下结论:泡状流的压力波动主要来源于气泡的运动和诱导湍流及液相湍流,其中在低流速下前者产生的压力波动幅度大于后两者;存在一个临界频率,低于该频率压力信号均方根随频率的增加而增加,高于该频率压力信号均方根随频率的增加而减小;发生流型转变时压力信号的时频特征发生明显改变,最大均方根出现在更低的频率区。
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| 关 键 词： | 泡状流 压力波动 多尺度分析 |
| 文章编号： | 0253-231X(2004)03-0427-04 |
| 修稿时间： | 2003年12月19 |
MULTI-SCALE ANALYSIS OF PRESSURE FLUCTUATION IN VERTICAL UPWARD BUBBLY FLOW |
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| BAI Bo-Feng,CHEN Xue-Jun State Key lab of Multiphase Flow in Power Engineering,Xi'an Jiaotong University Xi'an ,China.MULTI-SCALE ANALYSIS OF PRESSURE FLUCTUATION IN VERTICAL UPWARD BUBBLY FLOW[J].Journal of Engineering Thermophysics,2004,25(3):427-430. |
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| Authors: | BAI Bo-Feng CHEN Xue-Jun State Key lab of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China |
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| Institution: | BAI Bo-Feng,CHEN Xue-Jun State Key lab of Multiphase Flow in Power Engineering,Xi'an Jiaotong University Xi'an 710049,China |
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| Abstract: | The mechanism of pressure fluctuation in bubbly flow was investigated on basis of the
physical model of ideal single moving bubble. And the multi-scale time-frequency characteristics of
the fluctuation were analyzed with both the discrete wavelet and the statistics theory. The results
were induced as followed. The pressure fluctuation in bubbly flow is resulted from the moving bubble,
the derivational turbulence by bubble, and the liquid turbulence. The fluctuation amplitude resulted
from moving bubble can be greater than that resulted from other two reasons under the condition of
low liquid velocity. The distribution of RMS pressure has a distinguished difference across a critical
frequency, where the RMS pressure increases with frequency in the frequency region lower than the
critical frequency while decreases in the region greater than the critical one. The time-frequency
characteristic of pressure signal has a distinct change at the flow pattern transition, which the maximum
RMS pressure will transfer to a lower frequency. |
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| Keywords: | bubbly flow pressure fluctuation multi-scale analysis |
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