起伏管内局部油水两相流流动特性实验研究

Experimental Investigation on the Flow Characteristics of the Local Oil-water Two Phases Flow System in Hilly-terrain Tube

地形起伏成品油管道积水不仅降低管输效率、加速管道内壁腐蚀,其腐蚀产物还可引起干线设备堵塞,甚至计划外停输。采用0#柴油、自来水在内径50mm的地形起伏透明有机玻璃测试系统上对油流携带积水这一局部油水两相流系统进行了实验研究,发现:随油流剪切作用的增大,积水逐渐呈界面光滑分层流、界面波动分层流以及界面乳化分层流3种形态;一旦积水全部进入上倾管段,其平均运动速度随油相表观速度增大而线性递增,其平均截面含率随油相表观速度增大而线性递减;积水全部进入上倾管段时对应的油相表观速度随上倾倾角增大而增大,而积水量对其影响较小。结果表明采用上游来流可以将积水携带出去。

The study is motivated by the problem of pipeline corrosion due to water accumulation at low spots.Lab-scale experiments were conducted to identify the flow patterns of the hilly-terrain transparent organic glass tube.Test loop with pipe diameter of 50 mm I.D.with diesel and tap water was used.The oil-water flow patterns were found to develop from the smooth stratified flow to wavy stratified flow and even to emulsive stratified flow when residual water sheared by the faster flowing oil.With the increasing oil superficial velocity,the average water velocity increases linearly while the average water holdup decreases linearly once all the water entered the upwards inclined tube.The oil superficial velocity corresponding to the minimum Uos carrying all the water entering the upwards inclined tube was found to increase with the increasing inclination angle,but change a little with increasing water volume.These results show that water can be carried out by flowing oil.