Study on Angular Free Vibration Stability and Parameters Influence of Dry Gas Seal Based on the Characteristic Equation

Table 2

The default values of geometric and operating parameters.

Parameters	Value
Seal ring inner radius ri, mm	30
Seal ring outer radius ro, mm	42
Spiral groove inner dam radius , mm	33.6
Groove-to-land ratio κ	1
Spiral angle α, °	20
Number of grooves	12
Equilibrium ratio B	0.8
Gas viscosity μ, Pa·s	1.79 × 10^−5
Ambient pressure pa, MPa	0.101
Sealed gas pressure po, MPa	0.303
Rotational angular velocity Ω, rad·s^−1	376
Equilibrium film thickness hb, μm	8
Spring stiffness ks, N·m^−1	1 × 10^5
Auxiliary seal damping cs, N·s·m^−1	200
Transverse rotational inertia of the flexibly mounted stator I, kg·m^2	1.33 × 10^−4