Towards Physics Based Strategies for Separation Control over an Airfoil using Synthetic Jets
نویسندگان
چکیده
Effect of forcing using a modeled zero-net mass-flux (ZNMF) jet on a stalled NACA 4418 airfoil at Rc=40,000 is examined using two-dimensional numerical simulations. The baseline uncontrolled simulations are modeled after the experiments of Zaman & Culley. The simulations indicate that the stalled airfoil is subject to three naturally occurring frequencies corresponding to the shear layer, the separation bubble, and the wake. The jet forcing frequencies are chosen to match the shear layer and separation bubble frequencies. It is observed that forcing frequencies near the natural separation bubble frequency elicits the best response in terms of separation reduction and increase in lift-to-drag ratios. Using higher forcing frequencies that are close to the shear layer frequency does not reduce separation. However, the shear layer is found to be highly receptive to this forcing leading to a highly organized and coherent rollup and subsequent vortex merging process.
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