Test results for sawtooth-pattern damper seals: leakage and rotordynamic coefficients.
Test results consisting of direct and transverse force coefficients are presented for eleven, sawtooth pattern, damper seal configurations. The designation "damper" seal refers to a seal which uses a deliberately roughened stator and smooth rotor to increase the net seal damping force. The designation "sawtooth pattern" refers to a stator roughness pattern whose cross section normal to the axis of the seal resembles sawteeth with the teeth direction opposing fluid motion in the direction of shaft rotation. Sawtooth pattern seals had more damping than smooth seals but less than the round hole pattern seals tested previously. Stiffness of sawtooth and round hole pattern seals were comparable. Leakage of maximum damping configurations was greater for sawtooth pattern than for round hole pattern seals.
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