軸対称物体のすきま流れ振動 : 第3報,回転振動するときの軸対称物体に作用するモーメントの解析

概要

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Using a narrow annular passage between a tapered outer cylinder and a tapered axisymmetric body, we analyzed the moment of the fluid-dynamic forces acting on the body, which vibrates harmonically in the rotational mode. The moments were divided into those of inertia. damping and stiffness. The following conclusions were obtained by study of these coefficients. When the pivot is situated downstream of the passage inlet. intense dynamic instability due to negative damping and static instability due to negative stiffness occur when the passage is divergent. Static instability occurs even then the passage is convergent. If the pivot is situated at the passage inlet, the instability does not occur. The region of negative damping on the plane ν_1-ν_2, which is the angles of the tapered center body and outer cylinder, is approximately given by the straight line ν_1=ν_2. It was found that negative damping is caused by the effect of steady flow qo in the z direction.
一般社団法人日本機械学会の論文
1997-08-25