動的失速時の翼周辺はく離流と非定常空気力に関する研究 : 第4報,考察

概要

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The unsteady stall phenomenon of 15% thickness elliptic airfoils in incompressible two-dimensional flow at moderately large Reynolds numbers are examined in detail by analyzing the numerical and experimental results which are presented in the 1st, the 2nd and the 3rd report of present research. Discussions are focused on the behavior of stall vortices which are shed from the leading edge region subsequent to the leading edge separation, and its effect on the unsteady aerodynamic characteristics of the unsteady stall airfoils. The following results are obtained as a conclusion: 1) The stall vortex shedding phenomenon shows oscillatory behavior with a particular period. 2) The stall vortex shedding phenomenon and its periodic nature of oscillating airfoils appears almost in the same manner regardless of the value of mean angle of attack or oscillation frequency. 3) The full-time-stall flutter can be caused by a synchronization-like phenomenon when the airfoil oscillates near at the frequency of the stall vortex shedding phenomenon.
一般社団法人日本機械学会の論文
1989-02-25