长喉颈文丘里管气液两相流弹状流机理研究

为了实现气液两相流相含率测量并得到相关模型,结合气液两相流研究现状,采用近红外光谱技术与高速摄影技术结合的手段,利用近红外系统布置于长喉颈文丘里管喉管位置的新装置,将弹状流相间流动特征与近红外测量系统接收光强信号特征相结合,提出了把弹状流分成泰勒气泡与尾部气泡两部分的简化模型,在数据处理时对近红外接收光强高频信号进行有效分组,建立了新的气液两相流弹状流相含率测量模型。从一定程度上解决了弹状流不同部位的两相交界面对近红外接收探头接收光强信号影响差异较大的问题。新型模型的测量效果较好,所得结果测量误差较小。

Study on Slug Flow Mechanism of Gas-liquid Two-phase Flow based on Long Throat Venturi Tube

To study the phase holdup of gas-liquid two-phase flow and obtain the relevant model, by combining with the research status of gas-liquid two-phase flow, using the combination of near-infrared spectroscopy and high-speed photography, and using a new structure of the near infrared system located in the position of the Venturi tube of long throat, a simplified model was proposed by divide the slug flow into two parts, the Taylor bubble and the tail bubble, finally measurement model of the phase holdup measurement was obtainted. To some extent, the problem that the two-phase interface at different parts of the slug flow has a great influence on the received light intensity signal of the near-infrared receiving probe was solved. The measurement effect of the new model was better, and the measurement error of the obtained result was small.