遷音速タービン翼列の振動特性 : 第1報実験

概要

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The unsteady aerodynamic characteristics of cascaded turbine blades oscillating in transonic flows were experimentally studied in a linear cascade tunnel by the influence coefficient method. Two flow patterns were adopted, one of which had a near-design condition, and the other had an off-design con-dition with lower pressure ratio. From the measurement of unsteady aerodynamic force, a range of in-terblade phase angle was found where the blade vibration was unstable. The instability was remark-able in the near-design point, while it was much suppressed in the off-design condition. It was realized that the negative influence coefficients of damping from neighboring blades of the oscillating one were added each other in the near-design condition. In the off-design case, on the other hand, the coefficients were cancelled out to alleviate the instability. The different behavior of the damping should be attrib-utable to the significant phase change of the aerodynamic force around shock impingement point.
社団法人日本ガスタービン学会の論文
1999-01-20