油水两相分层流流动速度分布的激光诊断

Laser diagnosis of velocity profile in oil-water stratified flow

从LDA实测入手 ,研究了油水分层流流动速度分布问题。针对被测速度较低的特点 ,提出了实用的声光光学频移驱动技术。针对液液分界面弯曲的特殊情况 ,先使用两种不同的LDA的布置方案分别测量出不同区域内的速度分布 ,然后再组合成完整的速度分布。组合时采用了合理的测量点定位及校验方法 ,得到了不同轻相流量下的油水两相流速度分布曲线。以本实验结果为基础 ,文献 [7]修正了原有的油水两相分层流流动数学模型 ,提出了“剪切力比模型” ,该模型的计算结果与LDA实验数据吻合较好。

In this paper, the velocity profile of oil water stratified flow is studied, which focused on the laser Doppler anemometry (LDA) measurement. A practical driver for Bragg cell is designed to get the slow velocity. As the oil-water boundary is bent, the velocity profiles have to be made up by the velocities at different region which are got by using two different kinds of LDA arrangement, respectively. An effective position of LDA measurement points and position verification method have been utilized, and a series of velocity profiles with different oil flow rates achieved. According to the experiment results, the existing mathematical model on oil-water stratified flow is modified and a new model named “shearing stress ratio model” proposed [7] , which gives good coincident theoretical results with experimental profiles.