Self-acting lift-pad geometry for circumferential seals - a nocontacting concept
Gordon P. Allen, United States. National Aeronautics and Space Administration. Scientific and Technical Information Office, Lewis Research Center
National Aeronautics and Space Administration, Scientific and Technical Information Office, 1980 - Technology & Engineering - 8 pages
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10-centimeter-diameter actual leakage rate Aeronautics and Space Analysis predicted noncontact analyzed over ranges annulus axial checkout runs circumferential seal design clearance decreased close-clearance downstream pressure drop on leakage equilibrium clearance force was intended fuel-side seal garter spring helium purge hydrodynamic increased with speed labyrinth seals Lewis Research Center m/sec micrometers N/cm N/cm2 g/sec NASA National Aeronautics negligible wear NONCONTACTING CONCEPT opening force operating conditions oxidant and fuel pad recess Performing Organization PREDICTED LEAKAGE predicted noncontact operation Predicted performance presented in figure pressure drop pressure ranges purge-gas radial recess depth recess pad room temperature scatter in figure seal gap seal segment seal studied sealed fluid sealed pres sealed pressure sealed-pressure Security Classif Segmented circumferential seals self-acting circumferential seal SELF-ACTING LIFT-PAD GEOMETRY shear heating Space Administration speed and decreased speed and pressure speed and sealed startup and shutdown stream mental leakage system was analyzed Test results confirmed test runs Unclassified