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Dynamical behavior of unsteady flowfield of an elastically mounted flapping airfoil
Published in American Institute of Aeronautics and Astronautics Inc.
2018
Volume: 56
   
Issue: 5
Pages: 2062 - 2069
Abstract
The study reports the quasi-periodic flowdynamics behind a spanwise flexible flapping airfoil. In the qualitative transition in the unsteady flowfield, the trailing-edge wake loses its periodicity beyond a critical wind velocity and becomes quasi-periodic (QP) in nature. The quasi-periodic state is observed at a regime of comparable solid and fluid added mass. The quasi-periodicity of the wake is observed qualitatively by phase-averaged vorticity contours. Quantitative evidence of the dynamical transition has been presented using flowfield quantity vorticity as well as the time evolution of the aerodynamic loads. The correlation coefficient of the vorticity field and the reconstructed phase space, frequency spectra, PoincareÁ sections, and recurrence plots of the aerodynamic loads establish the presence of quasi-periodicity in the flow topology conclusively. The loss of periodicity is shown to lead to variability in the aerodynamic loads at the corresponding flow regimes, implying the potential requirement of feedback control mechanisms for stable operations at these flow regimes.
About the journal
JournalData powered by TypesetAIAA Journal
PublisherData powered by TypesetAmerican Institute of Aeronautics and Astronautics Inc.
ISSN00011452
Impact Factor1.868
Open AccessNo
Citation Styleunsrt
Sherpa RoMEO Archiving PolicyGreen
Concepts (15)
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    Aerodynamic loads
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    Aerodynamics
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    Airfoils
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    Phase space methods
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    Vorticity
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    Wakes
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    Correlation coefficient
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    CRITICAL WIND VELOCITY
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    Dynamical behaviors
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    DYNAMICAL TRANSITION
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    Frequency spectra
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    QUASI-PERIODICITIES
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    RECONSTRUCTED PHASE SPACE
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    UNSTEADY FLOWFIELDS
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    Flow fields