翼端間げきを有する振動翼列の非定常空力特性 : 第2報, 理論解析, 定常負荷がない場合

概要

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Following the experimental study reported in the previous paper, this report describes a theoretical analysis based on the potential flow. By use of the vortex lattice method, calculations were performed to obtain unsteady aerodynamic forces acting on oscillating blades with tip clearances. Calculated damping forces in the case of large tip clearances show good agreement with experimental data. When the clearance is small, however, there can be found a discrepancy between experimental and analytical results. This discrepancy was thought to be ascribable to the viscous effect of the flow near the blade tips. To explain the experimental data it was necessary to apply a model such that each blade should retain finite circulation at the extremity of its tip. From the calculated results for various reduced frequencies it was confirmed that aerodynamic characteristics found in the experimental study should be accepted in the wide range of reduced frequencies.
一般社団法人日本機械学会の論文
1988-03-25