Dynamic leakage path prediction method for rotary seal at high pressure rotor shaft of aero-engine considering viscoelasticity

By constructing a fully coupled constitutive model of viscoelasticity, temperature, and centrifugal force and multi-field coupled dynamic simulation, the problem of quantitative description of dynamic leakage channels of lip seals under high-speed rotation and high-frequency vibration conditions in the existing technology has been solved, realizing the scientific and quantitative design of the sealing system and improving the reliability and economy of the sealing structure.

CN122133400APending Publication Date: 2026-06-02SHANGHAI UNIV OF ENG SCI +1
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI UNIV OF ENG SCI
Filing Date
2026-03-05
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing lip seal designs fail to effectively consider the coupling of viscoelastic hysteresis, centrifugal, and temperature effects under the conditions of high-speed rotation and high-frequency vibration in aero engines. This results in an unclear mechanism for the formation of dynamic leakage channels, a lack of quantitative analysis methods, and difficulty in defining the critical conditions for seal failure, thus affecting the reliability and economy of the sealing system.

Method used

A fully coupled constitutive model of viscoelasticity, temperature, and centrifugal force is constructed. Through multiphysics transient simulation, key dynamic response data are extracted, leakage channels are identified, and the evolution law and safety boundary of the dynamic leakage channels are output. By combining multi-field coupled dynamic simulation and multi-dimensional result analysis, a quantitative description of the leakage channels and the identification of critical parameters are achieved.

Benefits of technology

The precise quantification of the phase lag angle under high-frequency operating conditions reveals the core mechanism of dynamic follow-up failure of the lip, provides full-process observation and quantitative description of dynamic leakage channels, clarifies the dynamic reliability design boundary of the sealing structure, and breaks through the limitations of traditional static theory.

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Abstract

This invention relates to the field of sealing technology and discloses a method for predicting dynamic leakage channels in rotary seals at high-pressure rotor shafts of aero-engines, considering viscoelasticity. The invention includes the following steps: constructing a fully coupled viscoelastic-temperature-centrifugal constitutive model; establishing and solving a multi-field coupled dynamic simulation model; dynamically characterizing the leakage channel and identifying critical parameters; and finally outputting the predicted results of the dynamic leakage channel and the sealing safety boundary. This provides a quantitative theoretical basis for the anti-leakage design and reliability assessment of lip seal structures in aero-engines. By constructing a fully coupled viscoelastic-temperature-centrifugal constitutive model, this invention integrates hyperelasticity, broadband viscoelasticity, and temperature effects to accurately quantify the phase lag angle under high-frequency operating conditions. It clarifies the core mechanism of viscoelastic hysteresis leading to dynamic lip follow-up failure, achieving a profound revelation of the physical root cause of dynamic leakage channel formation and overcoming the limitation of traditional static theory in explaining high-speed dynamic seal failure.
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