竖直窄矩形通道气液两相流流型识别研究

在实验研究的基础上，采用小波分析的方法对窄矩形通道内两相流的流型进行有效的识别，为在不可视或不能进行摄影测试技术特殊情况下提供了有效识别方法。通过可视化观察发现，窄矩形通道内两相流流型主要有泡状流、弹状流、搅混流和环状流。采用小波分析法给出了4种流型的功率密度图，并结合每种流型的特征及压差波动特性，对每种流型的频率分布范围及最大能量分布范围给出了界定。因此，利用频率分布特征值及最大能量分布值可对流型进行有效的识别和判定。

Identification and Study of Flow Patterns in Narrow Vertical Rectangular Channel

On the basis of the experimental study, two-phase flow pattern of the narrow rectangular channel by the way of wavelet analysis was identified effectively. An effective way to recognize flow pattern without visible case or high-speed photography was provided. By the visual observation, it is found that there are four flow patterns (bubble flow, slug flow, churn flow, and annular flow) in the narrow rectangular channel. The power density spectra of the four flow patterns were shown according wavelet analysis. The frequency distribution of each flow range and maximum energy distribution were also defined. Therefore, using the frequency distribution and the energy distribution maximum value can identify and determinate flow pattern effectively.