A Hybrid Model for Lift Response to Dynamic Actuation on a Stalled Airfoil

The current research focuses on modeling the lift response due to dynamic (time-varying) “burst-type” actuation on a stalled airfoil. Here, the “burst-type” actuation refers to the synthetic jet (generated from the actuator) that is used for flow separation mitigation. Dynamic “burst-type” actuation...

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Bibliographic Details
Published inEnergies (Basel) Vol. 13; no. 4; p. 855
Main Authors An, Xuanhong, Williams, David R., Hemati, Maziar S.
Format Journal Article
LanguageEnglish
Published MDPI AG 01.02.2020
Subjects
dynamic actuation
flow control
low-order modeling
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Summary:The current research focuses on modeling the lift response due to dynamic (time-varying) “burst-type” actuation on a stalled airfoil. Here, the “burst-type” actuation refers to the synthetic jet (generated from the actuator) that is used for flow separation mitigation. Dynamic “burst-type” actuation exhibits two different characteristic dynamic behaviors within the system; namely, the high-frequency and low-frequency components. These characteristics introduce modeling challenges. In this paper, we propose a hybrid model composed of two individual sub-models, one for each of the two frequencies. The lift response due to high-frequency burst actuation is captured using a convolution model. The low-frequency component due to nonlinear burst-burst interactions is captured using a Wiener model, consisting of linear time-invariant dynamics and a static output nonlinearity. The hybrid model is validated using data from wind tunnel experiments.
ISSN:1996-1073
1996-1073
DOI:10.3390/en13040855