加热上升管内相及相界面密度径向分布特性实验研究

运用双探头光学探针在加热上升管内对蒸汽-水丙相流空泡率和相界面密度径向分布特性进行了测量与研究。根据实验结果，研究了受热工况下相及相界面密度径向分布的基本规律。实验表明：加热上升管内汽液两相流空泡率在径向上的分布不均匀，工况不同，整个直径上空泡率分布可能是近U形、鞍形或中心区高于近壁区的近弧形，界面密度在整个直径上呈近似的U形分布。

An Experimental Study on the Characteristics of Phase and Interphase-density Radial Profile in a Heated Riser Tube

With the help of a dual-sensor optical probe measured and studied were the radial profile characteristics of both the void fraction of steam-water dual-phase flow and the interphase density in a heated riser tube. On the basis of test results the basic law of the phase and interphase density radial-profile was investigated. Through the investigation it is found that the void fraction of the two-phase flow in the heated riser tube exhibits in the radial direction a non-uniform distribution. Depending on different operating conditions, the void fraction distribution on the whole diameter may assume an approximate U-shape, saddle shape, or an approximate arc shape with a central zone located higher than a near-wall zone. The interphase density along the whole diameter features an approximate U-shaped distribution.