喷嘴释放单气泡的声发射特性

doi:10.11949/j.issn.0438-1157.20161794

化工学报 ›› 2017, Vol. 68 ›› Issue (5): 1794-1802.DOI: 10.11949/j.issn.0438-1157.20161794

喷嘴释放单气泡的声发射特性

王鑫, 李美慧, 李晓磊, 杨转, 何利民

中国石油大学(华东)储运系, 山东省油气储运安全省级重点实验室, 山东青岛 266580

收稿日期:2016-12-23 修回日期:2017-02-08 出版日期:2017-05-05 发布日期:2017-05-05
通讯作者: 王鑫
基金资助:
国家自然科学基金项目（51376197）。

Acoustic emission characteristics of single nozzled bubble

WANG Xin, LI Meihui, LI Xiaolei, YANG Zhuan, HE Limin

Provincial Key Laboratory of Oil and Gas Storage and Transportation, College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, Shandong, China

Received:2016-12-23 Revised:2017-02-08 Online:2017-05-05 Published:2017-05-05
Supported by:
supported by the National Natural Science Foundation of China (51376197).

摘要/Abstract

摘要：

利用声发射技术在单气泡发生实验装置中研究了气液两相流中单气泡的动力学特性，使用自行开发的采集处理程序进行气泡声信号的参数提取，采用统计分析、小波变换和快速傅里叶变换对声信号进行时域和频域范围的分析。分析结果表明，声发射技术可以检测到管内气泡的声信号，具有较高的信噪比，且声信号随着喷嘴尺寸的增大而增大，随着液相表面张力的减小而减小。比较不同喷嘴直径下气泡的频率谱，发现喷嘴释放气泡发出的声信号频率为150～200 kHz，且随着喷嘴直径的增大，峰值频率相应增大，提出了声信号峰值频率与气泡尺寸之间的关联式。同时得到了气泡上升过程中的连续形态变化，分析了气泡产生声音的机理。研究表明，声发射技术是一种灵敏度高、测量手段方便的方法，可用于气液两相流气泡运动特性的检测。

关键词: 气液两相流, 气泡, 测量, 声发射

Abstract:

Dynamic characteristics of single bubbles in gas-liquid two-phase flow were studied by acoustic emission technique in an experimental setup of single bubble generator. Parameters of acoustic emission signal in bubbles were extracted using self-developed data acquisition and processing program. The acoustic signals in time and frequency domains were then analyzed by statistical analysis, wavelet transform and fast Fourier transform. The results showed that the acoustic emission technique could detect acoustic signals of bubbles inside tube with a high signal to noise ratio, which the acoustic signal increased with the size of nozzle but decreased with the surface tension of liquid. By comparing frequency spectra of bubbles from nozzle with different diameters, it was found that the acoustic signal frequency emitted by bubbles was between 150—200 kHz and peak frequency increased with nozzle diameter. A correlation function was proposed between peak frequency of acoustic signals and bubble diameter. Meanwhile, a continuous bubble evolution diagram was obtained for bubble floating up and generation mechanism of acoustic signals by bubbles was analyzed. The study demonstrates that acoustic emission technique is highly sensitive and very convenient for measurement of bubble motions in gas-liquid two-phase pipe flow.

Key words: gas-liquid flow, bubble, measurement, acoustic emission

中图分类号:

TE832

王鑫, 李美慧, 李晓磊, 杨转, 何利民. 喷嘴释放单气泡的声发射特性[J]. 化工学报, 2017, 68(5): 1794-1802.

WANG Xin, LI Meihui, LI Xiaolei, YANG Zhuan, HE Limin. Acoustic emission characteristics of single nozzled bubble[J]. CIESC Journal, 2017, 68(5): 1794-1802.

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喷嘴释放单气泡的声发射特性

Acoustic emission characteristics of single nozzled bubble

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