基于热流固耦合的液膜密封动态追随性分析

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Abstract To thoroughly examine the dynamic tracking features of liquid film seals in the context of thermo-fluid-solid coupling, the small perturbation method and thermo-hydrodynamic lubrication theory are utilized. Accounting for non-compensated ring axial vibration and angular yaw, a motion equation with three degrees of freedom is formulated for the compensation ring. The influence of mechanical component parameters, operating condition parameters, and structural parameters on dynamic tracking is methodically compared and analyzed within both pure flow field and thermo-fluid-solid coupling models. The observations reveal that the disturbance values for liquid film seals computed under the thermo-fluid-solid coupling model are slightly less compared to those in the pure flow field model. Increasing excitation amplitude, spring stiffness, and O-ring damping contributes to heightened disturbance, consequently diminishing dynamic tracking effectiveness. In contrast, decreasing the rotational speed and elevating the medium pressure lead to an augmentation of dynamic characteristic coefficients, thereby enhancing dynamic tracking capabilities. Streamlining the number of grooves bolsters dynamic tracking, and with a fixed groove count, adopting structural parameters featuring a groove depth of 17μm, a groove dam ratio of 0.8, and a helix angle of 22° yields optimal dynamic tracking performance.

Key words： liquid film seal vibration characteristics small disturbance method thermal-fluid-solid coupling

Received: 22 March 2023 Published: 15 April 2024

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	Articles by authors
	SONG Yong1
	YU Bo1
	2
	HAO Muming2
	WANG Chenyin2
	LI Tianzhao2
	REN Baojie3

Cite this article:

SONG Yong1,YU Bo1,2, et al. Dynamic tracking performance analysis of liquid-film seal based on thermal-fluid-structure coupling[J]. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(7): 214-222.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2024/V43/I7/214

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