Selected test results are presented for an annular gas seal using a smooth rotor and a hole-pattern-roughness stator for a supply pressure of 70 bar, three pressure ratios, three speeds up to 20,000 rpm, two clearances, and three preswirl ratios. Dynamic data include frequency-dependent direct and cross-coupled stiffness and damping coefficients. Static data include leakage and upstream and downstream pressures and temperatures. Very good agreements are found between measurements and predictions from a two-control-volume bulk-flow model.

Issue Section:
Technical Papers
Keywords:
classical mechanics, elastic constants, damping, friction, mechanical stability
Topics:
Clearances (Engineering), Damping, Flow (Dynamics), Leakage, Pressure, Rotors, Stators, Stiffness, Excitation, Temperature, Friction, Honeycomb structures, Compressors, Uncertainty
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