水平管气液段塞流液塞长度演化规律研究

Slug Length Evolution of Gas-Liquid Slug Flow in Horizontal Pipe

以水-空气为工质,在内径50mm、长27m的水平管中实验研究了段塞流液塞长度的统计分布规律.实验结果表明,液塞长度受气液混合速度的影响很小,主要与管内径相关.以Taitel和Barnea提出的段塞流跟踪模型为基础,进一步考虑加速压降的影响,建立了新的段塞流跟踪模型,并采用面向对象技术编制了数值模拟软件,实现了数值跟踪.计算结果表明,液塞长度的变化主要受大气泡尾波控制,与气体膨胀关系不大;模型对液塞长度的预测结果基本不受入口平均值和分布形状的影响.实验和模拟结果均说明统计液塞长度较好地符合对数正态分布.管道中的U型弯头阻碍液塞充分发展,但对于较长液塞影响不大.

The evolution of the slug length distribution was investigated with airwater twophase flow in a 27 m long horizontal pipe. It is found that the slug length has not clear dependent relationship to the gasliquid mixture velocity and is mainly dependent on the pipe diameter. Based on the model provided by Taitel & Barnea,a new slug tracking model was developed which can take the effect of the acceleration pressure drop into considerathion. This model was implemented with objectoriented programming technique. And then the front and tail of every slug can be tracked numerically with the program. The simulation indicates that the gas compressibility has little effect on the slug length and the development of slug length is mainly determined by the wake effect. And the prediction results from this new model show that the slug length is not dependent on its average value and the distribution at the pipe inlet. The results of both the prediction and the measurement show that the slug length distribution follows a lognormal distribution. It is also found that the elbow in the middle of the pipe prevents the most slugs from developing fully along the pipe but might have little effect on the slugs longer than the elbow.