水平管液塞区相分布特征研究

设计建造了研究段塞流中液塞卷吸气体的实验装置,采用双头电导探针测量了水平管内固定液塞区域的局部相分布。液塞区含气率的径向分布存在峰值,表明液塞区存在湍流剪切层。随着进入液塞距离增大,含气率峰值减小,峰值对应的径向位置升高。这说明湍流剪切层内的湍流程度减弱,剪切层厚度变大。提出了计算水平管液塞截面平均含气率的方法,发现随着进入液塞距离的增大,截面平均含气率首先迅速减小,然后逐渐趋于稳定。

Phase Distribution Characteristics of Liquid Slug in Horizontal Pipe Flow

An experimental facility was constructed in horizontal pipe to study the gas entrainment in slug flow.The local phase distribution in liquid slug was measured by double-sensor conductivity probe.The measurements showed that there is a peak in the vertical distribution of the void fraction, indicated the existence of a turbulence shear layer.With the distance into the slug increasing,the void fraction peak of the vertical profile decreases and its position rises.It is shown that the thickness of the turbulent shear layer increases and the turbulent intensity decreases with increasing of the distance into the slug.A new method was proposed to calculate the cross section average void fraction in horizontal liquid slug.It is found that at first the average void fraction decreases quickly but then it tends stably while the distance into the slug increases.