摘要
研究了竖直管内沸腾两相流动时压力波动信号的特性,采用功率谱密度函数、分维数、关联维数及Kolmogorov熵等非线性分析方法对压力波动时间序列进行了定性及定量分析,考察了热流密度及液速对压力波动的影响规律。结果表明,此类系统具有非线性混沌特性。定量计算结果表明,分维数小于1.5,系统存在1个关联维。K熵的变化也具有同样的趋势,且为有限正值;沸腾流动的汽液两相流型和非线性特征量之间有一定的关系。
Experiments were carried out to study the feature of pressure fluctuating in a vertical tube for boiling two-phase flow. The time series of pressure fluctuation were analyzed by means of power spectrum density, rescaled range （R/S）, correlation dimension and Kolmogoroy entropy analyses. And the effects of heat flux and liquid velocity on the pressure fluctuations were stressed study. The results showed that the system was nonlinear and chaotic. These quantitative numbers were greatly influenced by the heat flux and liquid velocity. In different velocity of flow, the fractal dimension is less than 1.5 under the various heat flux, and positive finite value of the Kolmogorov entrcpy was found. There was corresponding relationship between flow regime of vapour-liquid two phase flow and the quantitative numbers.
出处
《化学反应工程与工艺》
CAS
CSCD
北大核心
2010年第1期7-13,共7页
Chemical Reaction Engineering and Technology
