郑州航空工业管理学院学报

航空发动机回油管中气泡的流动特性直接影响润滑系统的稳定性和润滑效率，因此深入研究其流动特性对优化系统设计具有重要意义。首先采用VOF(Volume of Fluid)模型对回油管中单个气泡流动随时间的变化进行了数值计算，然后分析了气泡直径、滑油流速、气泡数量和气泡排列方式对气泡流动特性的影响，最后获得了回油管中滑油速度场和压力场的分布。研究表明：气泡在浮力、表面张力和黏性力的作用下，向管道壁面顶部流动并伴随着形变，抵达壁面附近处发生破碎，最后破碎的气泡又在管壁上方聚并成条状气泡；气泡的形态变化会导致滑油流速总体呈现增大的趋势，但在气泡聚并过程中，滑油流速会有短暂的减小，随着气泡形态的逐渐稳定，滑油流速也最终趋于稳定；回油管内滑油流速越大，气泡发生破碎的时间越晚；当滑油流速不变时，气泡直径的变大和数量的增多会使气泡形变程度加剧；气泡的排列方式也会对气泡的流动特性产生影响。研究结果可为航空发动机润滑系统中气液两相流输送过程的优化设计提供理论支持，尤其对气泡破碎—聚并动态调控具有工程指导价值。

The flow characteristics of air bubbles in the scavenge pipe of an aero-engine directly influence the stability and efficiency of the lubrication system. Therefore,an in-depth investigation into bubble flow behavior is of critical importance for optimizing the design of lubrication systems. Firstly, the Volume of Fluid(VOF) model is employed to conduct numerical simulations of the temporal evolution of single-bubble flow within the scavenge pipe.Secondly,the effects of bubble diameter,lubricant flow velocity,bubble quantity,and bubble arrangement on the bubble flow characteristics are analysed. Finally, the distributions of the velocity field and pressure field of the lubricant oil in the scavenge pipe are obtained. Results show that driven by the combined action of buoyancy,surface tension,and viscous forces,bubbles flow toward the upper section of the pipeline wall,deform and break up near the wall,after which the fragments recombine above the wall to form elongated bubbles. Bubble deformation leads to an overall increase in lubricant flow velocity;however,a transient decrease in velocity occurs during bubble coalescence. As bubble shapes stabilize,the lubricant flow velocity also reaches a steady state. Higher lubricant flow velocity delays bubble breakage,while at a constant lubricant flow velocity,increases in bubble diameter and quantity amplify bubble deformation. Moreover,bubble arrangement significantly influences their flow characteristics. The research findings in this paper provide theoretical support for optimizing the gas-liquid two-phase flow transport processes in aero-engine lubrication systems,and offer particular engineering significance for the dynamic control of bubble breakup and coalescence.