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

Abstract

The current research focuses on modeling the lift response due to dynamic (time-varying) 1 'burst-type' actuation on a stalled airfoil. Dynamic 'burst-type' actuation exhibits two different 2 characteristic dynamic behaviors within the system, namely the high-frequency and low-frequency 3 components. These characteristics introduce modeling challenges. In this paper, we propose a hybrid 4 model composed of two individual sub-models, one for each of the two frequencies. The lift response 5 due to high-frequency single burst actuation is captured using a convolution model. The low-frequency 6 component due to nonlinear burst-burst interactions are captured using a Wiener model, consisting of 7 linear time-invariant dynamics and a static output nonlinearity. The hybrid model is validated using 8 data from wind tunnel experiments.9