油气润滑系统中环状流流过突扩管时的流动特性

The characteristics of the annular flow through the sudden-expansion pipe of the oil-air lubrication system

基于Fluent软件分析了油气润滑工况下环状流流过突扩管时的压力和油膜变化特点。结果表明,油气环状流流过突扩管时压力和油膜会发生突变,且突变的位置不会受到入口气速的影响,但是其变化的强度与入口气速的大小呈正比;油气环状流的液膜在管路突扩前分布的部分分布较为均匀,而在管路突扩后的分布受到气速和管径的影响较大,较大的气速和突扩管径会使环状液膜分散的程度增大。

The characteristics of variations in pressure and film have been analyzed when the annular flow through the sudden-expansion pipe in oil-air lubrication system based on Fluent. The results show that the pressure and oil film mutates when the annular flow through the sudden-expansion pipe and the position of pressure and film suddenly changes is not affected by the velocity of inlet air, but the strength of pressure and film changing is in direct ratio with it. The film of oil-air annular flow in the pipeline before the suddenly expanding part is well-distributed, but the distribution after that is widely affected by the velocity of air and the diameter of the pipe, the larger air velocity and the diameter of the sudden-expansion pipe increase the degree of dispersion of the annular flow film.