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Open AccessArticle

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

Department of Mechanical & Aerospace Engineering, Princeton University, Princeton, NJ 08544, USA
Department of Mechanical, Materials, and Aerospace Engineering, Illinois Institute of Technoogy, Chicago, IL 60616, USA
Department of Aerospace Engineering & Mechanics, University of Minnesota, Minneapolis, MN 55455, USA
Author to whom correspondence should be addressed.
Energies 2020, 13(4), 855;
Received: 16 December 2019 / Revised: 30 January 2020 / Accepted: 11 February 2020 / Published: 15 February 2020
(This article belongs to the Special Issue Control of Dynamic Flow Fields)
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. View Full-Text
Keywords: flow control; dynamic actuation; low-order modeling flow control; dynamic actuation; low-order modeling
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An, X.; Williams, D.R.; Hemati, M.S. A Hybrid Model for Lift Response to Dynamic Actuation on a Stalled Airfoil. Energies 2020, 13, 855.

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