An entrance region friction factor model applied to annular seal analysis: theory versus experiment for smooth and honeycomb seals.
A friction factor model is developed for the entrance region of a duct. The model is used in an annular gas seal analysis similar to Nelson's. Predictions of the analysis are compared to experimental results for a smooth stator/smooth rotor seal and three honeycomb stator/smooth rotor seals. The model predicts leakage and direct damping well. The model overpredicts the dependence of cross coupled stiffness on fluid prerotation. The model predicts direct stiffness poorly.
author list (cited authors)
Elrod, D., Nelson, C., & Childs, D.