轴承腔气相介质流场的理论与试验

采用有限元数值分析和试验研究的方法,研究了航空发动机轴承腔气相介质的压力场和速度场,探讨了转子转速和密封进气量等工况参数对轴承腔气相介质压力和速度分布的影响规律,研究工作表明:轴承腔气相介质压力随着转子转速、无量纲径向坐标、密封进气量的增加而增高;气相介质无量纲切向速度随着转子转速增高而增大,随着密封进气量增大而减小.试验结果表明:随着转子转速和密封进气量的增加,气相介质压力的试验结果与计算结果吻合性均增高.通过计算和试验揭示出的工况参数对轴承腔气相介质压力的影响规律,有助于轴承腔气相介质流动物理特性研究的完整性. 

Theory and experiment on air flow field in bearing chamber

Investigations into the pressure and velocity fields for the air in an aero-engine bearing chamber were conducted using the finite element numerical method and experimental study. The influence of the operating parameters, such as the rotor speeds and the sealing air mass flow rates, on the pressure and velocity distributions of air in bearing chamber was discussed. The research results show preliminarily that the air pressure in bearing chamber mounts up with the increasing rotor speeds, nondimensional radial coordinate and sealing air mass flow rates. In contrast, the nondimensional tangential velocity of air in bearing chamber increases with the enhanced rotor speeds, and decreases with the increasing sealing air mass flow rates. The experiment results show that as the rotor speeds or the sealing air mass flow rates increase, the experimental data of air pressures agree more with the computational results. The operating parameters from computational and experiment can contribute to further complete the research on aspects of the air in bearing chamber.