AN ANNULAR GAS SEAL ANALYSIS USING EMPIRICAL ENTRANCE AND EXIT REGION FRICTION FACTORS
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abstract
Wall shear stress results from stationary-rotor flow tests of five annular gas seals are used to develop entrance and exit region friction factor models. The friction factor models are used in a bulk-flow seal analysis which predicts leakage and rotor-dynamic coefficients. The predictions of the analysis are compared to experimental results and to the predictions of Nelsons analysis (1985). The comparisons are for smooth-rotor seals with smooth and honeycomb-stators. The present analysis predicts the destabilizing cross-coupled stiffness of a seal better than Nelsons analysis. Both analyses predict direct damping well and direct stiffness poorly.
