Stability mechanism of face seals in aero-engines under mutation conditions

Investigating the impact of acceleration variations on seal stability is crucial for reducing leakage and mitigating rubbing of sealing rings. In this paper, a dynamic model is established to relate takeoff acceleration excitation to film thickness response and system leakage rate, effectively extracting key excitation parameters of take off acceleration.

By numerically solving the Navier-Stokes equations, crucial parameters of the aero-engine end face seal are accurately obtained, including opening force, and fluid film stiffness, and so on. Based on this, the Volterra series theory is innovatively applied to calculate the frequency domain response of the fluid film induced by excitation, and the effects of excitation force, rotational speed, and pressure on leakage rate are systematically analyzed.