入口旋回流速度が平行環状シールの動特性に及ぼす影響 : 乱流係数を適用した平均化されたナビエ・ストークス方程式に基づく数値解析 : 機械力学,計測,自動制御

概要

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Averaged Navier-Stokes equations with turbulent coefficients and the continuity equation are applied to a theoretical investigation of the effects of inlet swirl velocity on the dynamic characteristics of annular plain seals employed in pumps. The turbulent coefficients are calculated based on the "law of the wall" and Prandtl's mixing length hypothesis. The numerical results show that for any eccentricity ratio at an equilibrium position of the rotor center and for any rotor spinning velocity, the inlet swirl velocity significantly influences the cross-coupled stiffness terms, whose magnitudes increase as the inlet swirl velocity increases in the direction of the rotor spin. This phenomenon yields an increase of the whirl-frequency ratio, resulting in a narrower stable range of the rotor spinning velocity.
社団法人日本機械学会の論文
2001-04-25