柔性端面气膜密封流场分析及密封特性研究

提出一种航空发动机主轴承端适用密封——柔性端面气膜密封.通过对三种密封端面变形情况下的压力控制方程进行求解,获得密封气膜微尺度流场特性的演变规律,并探讨关键密封性能参数与工况条件的相关性.研究结果表明:柔性端面在带压气膜的作用下发生变形,其中波箔片的变形起主导作用,平箔片的影响可忽略不计;相较于刚性端面,柔性端面可有效...

Flow Field Analysis and Sealing Characteristics Research of Flexible EndFace Gas Film Seals#br#

A flexible end face gas film seal was proposed for aero-engine shaft end seals. By solving the pressure governing equations under three kinds of sealing end face deformation， the evolution law of the micro-scale flow field characteristics of the sealing gas film was obtained， and the correlation between the key sealing performance parameters and the working conditions was discussed. The research results show that the flexible end face is deformed under the action of the compressed gas film， among which the deformation of the corrugated foil plays a leading role， and the influence of the flat foil is negligible. Compared to the rigid end face， the flexible end face may effectively increase the opening forces of the gas film， and the leakage rate also increases. Under different inlet and outlet pressure ratios， speeds and initial gas film thickness， the sealing characteristics of the two situations show different trends， the gap wedge effectiveness makes the viscous friction torque and gas film stiffness change rate of the flexible end face both are smaller than that of the rigid end face. Inferred from the research results， the flexible end face structure may have a more stable comprehensive sealing performance under high-speed and low-pressure conditions.