What question did this study set out to answer?

To study the vortical flow patterns in the wake of an oscillating airfoil and their control mechanisms.

September 1, 1989

Vortical patterns in the wake of an oscillating airfoil

Key Points

To study the vortical flow patterns in the wake of an oscillating airfoil and their control mechanisms.
Utilized a low-speed water channel to observe flow patterns.
Examined the effects of oscillation frequency, amplitude, and waveform shape on wake structure.
Measured axial flow within wake vortices.
Control over wake structure is significantly influenced by oscillation frequency and amplitude.
Axial flow was observed along wake vortices, showing a linear relationship with oscillation parameters.

Abstract

The vortical flow patterns in the wake of a NACA 0012 airfoil pitching at small amplitudes are studied in a low speed water channel. it is shown that a great deal of control can be exercised on the structure of the wake by the control of the frequency, amplitude and also the shape of the oscillation waveform. An important observation in this study has been the existence of an axial flow along the cores of the wake vortices. Estimates of the magnitude of the axial flow suggest a linear dependence on the oscillation frequency and amplitude.

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Cite This Study

Manoochehr Koochesfahani (Fri,) studied this question.

synapsesocial.com/papers/6a0234bb41336b55ab781043 https://doi.org/https://doi.org/10.2514/3.10246

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