A ROTORDYNAMIC ANALYSIS OF AN ANNULAR HONEYCOMB SEAL USING A 2-CONTROL VOLUME MODEL

Basic equations are derived for an annular honeycomb gas seal based on a two-control volume model. The two-control volume model includes add itionally a transient radial velocity component at a porous honeycomb stator surface while a conventional one-control volume model takes onl y the axial and the circumferential velocity components in a seal. By using a perturbation analysis and a numerical integration method, the basic equations are solved to yield the force and the corresponding dy namic coefficients developed by the seal. The two-control volume model analysis is compared to both the one-control volume model and experim ental results. The comparisons show that the two-control volume analys is generally improves the predictions of rotordynamic coefficients, es pecially, for direct damping.