Stochastic flutter of multi-stable non-linear airfoil in turbulent flow
Ying Hao 1, 2,   Zhi-Qiang Wu 1
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School of Mechanical Engineering, Tianjin University, Tianjin, China
College of Civil Engineering and Mechanics, Yanshan University, Qinhuangdao, China
Submission date: 2019-03-11
Acceptance date: 2019-08-20
Online publication date: 2020-01-15
Publication date: 2020-01-15
Journal of Theoretical and Applied Mechanics 2020;58(1):155–168
Stochastic airfoil flutter in an unsteady flow is discussed using the stochastic P-bifurcation method, taking into account potential effects of the longitudinal and vertical turbulent flow. The critical conditions of stochastic P-bifurcation are deduced by stochastic singularity analysis in order to discuss stochastic P-bifurcation phenomena. The results of parameter analysis show that as the turbulent intensity increases, the critical flutter velocity for sharp stochastic airfoil flutter decreases. And the large amplitude vibration comes earlier; an increase in the turbulent scale causes an earlier appearance of the critical velocity for large amplitude stochastic flutter.
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