2026-10-11T10:25:38Z https://www.scidb.cn/oai

10.57760/sciencedb.39879 2026-06-22T15:43:47Z

2026-06-22 Stability mechanism of face seals in aero-engines under mutation conditions doi:10.57760/sciencedb.39879 en During the takeoff phase, aero-engines and their hydrodynamic seals are subjected to intense acceleration, leading to sudden changes in operating conditions that can easily cause seal instability, thereby limiting the application of large-scale engines. 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. The study reveals that when the main axis rotates at speeds between 1500~3000 r/min, rubbing occurs between the rotating and stationary rings, and as the rotational speed increases, the excitation frequency band for contact gradually narrows. Under constant excitation frequency and force, the thickness of the fluid film and leakage rate, increases with the rise in rotational speed and pressure. The theoretical calculation results are consistent with experimental data. This research deepens the understanding of the stability mechanism of aero-engine end face seals under sudden operating conditions and provides a theoretical foundation for related fields. End face seal; stability; multi-frequency coupling; rubbing; experimental verification Sun Dianfeng Xu Xiaohua Hu Qiong Liu Zhixian Liu Zhixian Liu Fei Liu Entao PUBLIC https://creativecommons.org/licenses/by-nc-nd/4.0/ dataset Science Data Bank