IGTC-77 Mistuning Effects on Torsional Flutter of Leading Edge Stalled Cascades(Session D-4 VIBRATION II)

概要

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As an approach to flutter suppression, mistuning effects on leading edge stalled cascade flutter in torsional mode have been investigated, paying attention to the fact that the cascade blades actually have fluctuation in natural frequency produced through manufacturing process. The flutter suppression effect by mistuning is confirmed. A more significant flutter suppression effect is expected from slight mistuning for stalled cascades than for unstalled ones. Within the range of normal blade manufacturing imperfections, the larger the standard deviation on blade natural frequency becomes, the more stable the cascade becomes. The blade group should therefore not be selected in such a way that the standard deviation decreases and the group itself consequently approaches to the tuned one. Special care must be taken to avoid a blade arrangement, where the blades having exactly or nearly equal natural frequencies are successively placed. An alternating arrangement, which is concluded to be optimum in an unstalled condition, does not necessarily give the satisfactory flutter suppression effect in a stalled condition.
公益社団法人日本ガスタービン学会の論文
1991-10-00