The mathematical model of air-liquid two-phase annular flow for the oil-air lubrication was established. The formation mechanism of the annular flow in the horizontal pipe was studied,and its influence trend of the oil and air's velocity was researched through the Fluent simulation. The results show that the flow pattern of the air-oil two-phase changes with air velocity,changing from stratified flow to annular flow,then to fog flow. The transition from the stratified flow to annular flow is due to the wall attachment effect, and the transformation of the annular flow to the fog flow is the result of the air phase's tearing the oil phase into small droplets,and in uniform mixing. The relationship is positive correlation between the shortest length of the inlet and the air velocity in a certain range.%建立油气润滑气液两相环状流的数学模型,通过Fluent仿真,研究水平管内环状流的形成机制以及油气流速对其影响趋势.结果表明:气液两相流型随气相速度的变化,从分层流向环状流和雾状流转变,其中分层流向环状流的转变是附壁效应和气相涡旋流动的结果,环状流向雾状流的转变是气相撕裂油相形成细小油滴,并均匀混合的结果；在一定范围内最短进口长度和气速成正比关系.
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