基于环形管差压波动信号测量气液两相流气相含率的研究

设计了一种新型多圈环形管用于气液两相流参数的测量,对环形管上升段水平方向内外侧差压波动信号进行了分析,采用无因次分析方法获得与差压波动信号均方根相关的特征量,建立了此特征量与容积含气率的关系模型,并在此基础上进行了实验.实验结果表明与差压波动信号均方根有关的特征量和容积含气率存在一定的关系,在考虑到气体密度的影响之后,引入气体密度对关系模型进行修正,建立了差压波动信号均方根和容积含气率量纲1的线性关系模型.在容积含气率小于0.65时,气液两相流的容积含气率测量误差小于5%,为气液两相流的容积含气率测量提供了一种方法.

Research on the Gas-Holdup Measurement of Gas-Liquid Two-PhaseFlow Based on the Dynamical Differential Pressure Signals of Multi-Loop Meter

A new multi-loop flow sensor is designed for the parameters measurement of gas-liquid twophase flow. The dynamical differential pressure signals of gas-liquid two-phase flow collected from the rising section at the horizontal diameter of the multi-loop sensor are analyzed. A characteristic value related to the variance of the dynamical differential pressure signals is obtained. The relationship between the characteristic value of differential pressures and the volumetric void fraction is established. The gas density is introduced for the correction of this mode. The experiments were carried out on the horizontal multiphase flow loop. The non-dimensional method was applied to analyze the data. The relationship between the volumetric void fraction and the non-dimensional value are achieved. The online measurement of the volumetric void fraction of gas-liquid two-phase is realized through the multi-loop flow sensor. The experimental results showed that the determination error of the measurement of volumetric void fraction can be limited within 5 %, when the actual volumetric void fractions were less than 0.65.