軸対称物体のすきま流れ振動 : 第2報, 並進一自由度系における軸対称物体の安定性解析と実験

概要

論文の詳細を見る
We present analytical and experimental studies on the stability of an axisymmetric body which vibrates with one degree of freedom of translational motion in a narrow annular tapered passage. The leakage models are three divergent passages and one parallel passage. For the divergent passages, the angles of the wall surface of the outer cylinder to the axial direction are negative, zero and positive. When the flow rate of water is gradually increased or decreased,`the damping ratio of the system and the critical flow rate at the stability boundary are measured under conditions of the variable natural frequencies. If the angle of the wall surface is negative, it is necessary that area ratio of the exit to the inlet used in the calculation be smaller than the designed passage because the leakage flow separates from the wall surface. From the agreement between the experimental and calculated results, we conclude that the theory on the damping ratio is reasonable. The calculated results for the nondimensional critical flow rate increase linearly with for increasing natural frequency. When the flow rate is decreased, the theoretical results for the critical flow rate agree well with the experimental results.
社団法人日本機械学会の論文
1996-08-25