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

Xuanhong An, David R. Williams and Maziar S. Hemati
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Xuanhong An: Department of Mechanical & Aerospace Engineering, Princeton University, Princeton, NJ 08544, USA
David R. Williams: Department of Mechanical, Materials, and Aerospace Engineering, Illinois Institute of Technoogy, Chicago, IL 60616, USA
Maziar S. Hemati: Department of Aerospace Engineering & Mechanics, University of Minnesota, Minneapolis, MN 55455, USA

Energies, 2020, vol. 13, issue 4, 1-12

Abstract: 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.

Keywords: flow control; dynamic actuation; low-order modeling (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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