Abstract
The influence of inlet swirls on dynamic fluid reaction moments and forces of a long annular seal was experimentally studied. The experiment was conducted under the parameters of rotor speeds, cylindrical whirling speeds and seal inlet swirl velocities. The rotor and the outer cylinder were set in a concentric condition. The tangential and restitutional moments were derived from the measured dynamical fluid forces in order to investigate the influence of the inlet swirl. Moments and forces were expressed as stiffness, damping coefficients and added mass. As a result, it was found that the dynamic characteristics of moments and forces are affected by the inlet swirl velocity. The cross-coupling terms of moment coefficients change their sign when the inlet swirl velocity turns to the opposite direction.
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