Experimental study of dynamical characteristics of a long annular seal. Influence of inlet swirl on the dynamic fluid moment and force.

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  • 長い平行環境シールの動的流体力に関する実験的研究　モーメントおよび並進力に及ぼすシール入口部の旋回流速度の影響

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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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