轴承腔中考虑油滴运动的气相物理场分析

Analysis of Airflow Field in Bearing Chamber Considering Droplet Motion Impact

航空发动机轴承腔中考虑油滴运动的气相物理场分析是进行二次流及润滑系统设计的基础工作。因此,采用有限元数值分析的方法,研究了轴承腔中嵌入油滴运动影响条件下气相介质的速度场、温度场和压力场,并探讨了转子转速对气相介质流动速度、温度以及轴承腔连通区域压力分布的影响规律。分析结果表明:随着转子转速的增大,气相介质流动速度和温度增大,同时进气腔与回油腔之间压力差减小。此外,将考虑油滴运动的气相物理场与油滴/空气相的耦合计算方法所得结果进行对比,据此确定本文所采用研究方法的准确性及其在计算时间上的优势。

Analysis of airflow field in aero-engine bearing chamber is essential to design of secondary flow system as well as lubrication system.The investigations of the velocity,temperature and pressure fields for the air in an aero-engine bearing chamber were conducted with the finite element method.The influence of the rotor speeds on the velocity,temperature and pressure between the connection field in bearing chamber was discussed.The results show that the velocity and temperature of air increase with the increasing of rotor speeds while the pressure difference among the adjacent chambers decreases with the increasing of rotor speed.The accuracy and low computaion time of the present method is demonstrated by comparing the results via the airflow fields and the air/droplet coupling fields.