关键词: 航空发动机;参数模型;转子;润滑;流场;质点运动学;离散相模型;颗粒运动轨迹

Abstract: In order to study the effects of lubricant particle movement in the annulus inter-spools on oil collection efficiency of under-ring lubrication and oil-gas separation efficiency in bearing chamber, a lubricant particle trajectory parametric model was established based on particle kinematics under the boundary layer flow field structure in the annulus inter-spools, and the numerical results of computational fluid dynamics (CFD) verified by experiments were used to verify the model. The boundary layer flow field structure was determined by modifying the velocity distribution of Karman three-layer structure in turbulent boundary layer.The results show that the proposed parametric model can well describe the particle motion law in the annulus inter-spools. The larger particles reach the outer axis directly or along the arc line, and the smaller diameter particles have a maximum diameter that make particles can not reach the outer axis in a given residence time. The particles smaller than this critical diameter will be blown away from the annulus when there is an axial flow.

Key words: Aeroengine;Parameter model;Rotor;Lubrication;Flow field;Particle kinematics;Discrete phase model;Particle motion trajectory