前縁失速型の翼の失速フラッタ

概要

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A experimental investigation of stall flutter of 15% thickness elliptic airfoils, of leading dege stall type, oscillating in pitch with small amplitude about their midchords is carried out over a wide range of mean angles of attack and oscillation frequencies at Reynolds numbers of 1×10^5 and 2×10^5. Unsteady aerodynamic characteristics of the airfoils, flow fields with flow separations and tieir relationships are studied in terms of unsteady surface pressure, aerodynamic forces and moments and aerodynamic work per cycle of oscillation. Three types of stall flutter according to the mean angle of attack are apparent. When the mean angle of attack is within a range a little above the static stall angle, though the airfoil is in stall condition all the time throughout a cycle of oscillation, the stall flutter which shows a similar feature to dynamic stall of airfoils oscillating in and out of stall with large amplitude is observed.
一般社団法人日本機械学会の論文
1989-02-25