摘要
用IFA300热膜风速仪以高于对应最小湍流时间尺度的分辨率精细测量了环流反应器内不同空间位置的气液两相流瞬时速度信号,用子波分析的能量最大准则辩识气液两相流中气泡结构的尺度.以子波系数的瞬时强度因子和平坦因子作为检测特征,提出检测气液两相流中单个气泡结构的条件采样方法,并测量了单个气泡的平均强度,提取了单个气泡结构的条件相位平均波形,研究了气液两相流中气泡结构运动的动力学过程,以及去除气相前后的湍流多尺度能量分布、平坦因子等统计特征.
The velocity time sequence of gas-liquid two-phase flow at different vertical locations in a reflux reactor was measured by IFA300 constant-temperature hot-film anemometer with resolution higher than the frequency that corresponds to Kolmogorov dissipative scale. The scales of bubble structure in gas-liquid two-phase flow were discriminated by using the energy maxima criterion of wavelet analysis. A condition sampling method was presented, by which characterized by instantaneous intensity factor and flatness factor of wavelet coefficients to discriminate the singular structure in gas-liquid two-phase flow. Measured the average intensity of single bubble structure and extracted the phase-averaged evolution course for single bubble structure. Studied the dynamics course of bubble structure movement coming from gas-liquid flow, and the statistical characterization of energy distribution and flatness factor of multi-scale gas-liquid two-phase turbulent flow under conditions of contains and eliminating bubble structure.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2005年第6期805-808,共4页
Journal of China Coal Society
基金
国家自然科学基金联合资助项目(10472081
10232020)
黑龙江省教育厅科学技术研究项目(10551280)
黑龙江省科学技术厅科技计划项目(GC04A516)
关键词
子波分析
气液两相流
气泡结构
相位平均波形
环流反应器
wavelet analysis
gas-liquid two-phase turbulent flow
bubble structure, phase-averaged evolution course
reflux reactor
