横掠水平管束间气-液两相流流型对流致振动激励的影响

Flow Patterns of Air-Water Two-Phase cross a Tube Bundle and Their Effect on Excitation of Flow-Induced Vibration

在气-液两相流现有的Taitel流型图和Ulbrich&Mewes流型图的基础上,通过分析试验数据提出一种新的流型图,根据该流型图将垂直向上横掠水平管束的气-液两相流分为3种流型:泡状流、搅拌-泡状流和间歇流,给出这3种流型下的两相流作用在管束上的激励力的时间历程、功率谱密度曲线和功率谱密度峰值对应的Strouhal数。分析表明,在管束间两相流流致振动问题中,流型对于激励力时程、功率谱密度曲线的形状和频率分布均有明显影响。

Based on the existing Taitel map and Ulbrich Mewes map,a new flow pattern map was proposed based on the analysis of the experimental data.According to this map,three typical flow patterns can occur in vertically upward shell-side flow in tube arrays,namely,the bubbly,churn-bubbly and intermittent flows.In different patterns,the typical time-history,power spectral density（PSD） curves and Strouhal numbers associated with the peak PSD of excitation forces working on tube bundle are given.There are obvious effects of flow pattern on the time-history of excitation forces,the shapes and frequency distribution of PSD curves.