Leakage Performance and Static Stability of Hybrid Labyrinth-Honeycomb Seals

A three-dimensional numerical model of the hybrid labyrinth-honeycomb seal was established. The static stability and leakage characteristics of the hybrid labyrinth-honeycomb seal were investigated and compared to the traditional labyrinth seal in the choked/unchoked flow condition and different eccentricity. Results showed that the leakage flow rate of the two kinds of seals increased with the increasing eccentricity, while the hybrid labyrinth-honeycomb seal showed better leakage performance than the traditional labyrinth seal. The fluid-induced force and static stiffness coefficient of two kinds of seals in the choked and unchoked condition were negative, which was prone to the static instability of the system. Compared to the traditional labyrinth seal, the absolute value of the static stiffness coefficient of the hybrid labyrinth-honeycomb seal was smaller, and hybrid labyrinth-honeycomb seal possessed a relatively better stability.