Stability Analysis of Graphite Circumferential Seal Considering Perturbation

With the rapid development of aviation engine technology, the performance requirements for sealing systems under harsh operating conditions are also increasing. This article focuses on the graphite circumferential sealing system of an aircraft engine, and analyzes the structure and stress of the graphite circumferential sealing system under the influence of sealing runway vortex, sealing gas, and structural and operating parameters. The graphite circumferential sealing system is simplified as a radial vibration model of spring damping mass, and the dynamic equation of the graphite circumferential sealing system under coupled disturbance is established. Based on the theory of motion stability, the state space equation and equilibrium point of the sealing system under decoupled disturbances were solved, and the displacement response, axis trajectory, and other dynamic behaviors of the sealing ring and sealing runway were obtained through numerical simulation. The operation state and stability law of the graphite circumferential sealing system under disturbances were analyzed. The research results provide guidance for the optimization design of graphite circumferential sealing systems. Keywords: graphite circumferential seal, perturbation, dynamic characteristics, seal