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Optimisation of Trapped Vortex Cavity for Airfoil Separation Control
Author(s): Chintan Panigrahi, Raman Chawla, Manoj Nair
Keywords: Airfoil separation control, cavity, trapped vortex, multi-objective optimization
With the current boom in the aircraft industry, manufacturers worldwide aim to carry larger loads efficiently. The goal is to increase the efficiency of an airfoil, and flow control is one of the approaches that has been explored in this paper. Flow control techniques can be categorized in two ways, i.e. passive control requiring no auxiliary power and active control requiring open loop or closed loop power supply. In this study, we aim to optimize the shape of the airfoil by minimizing the amount of passive power required to trap the vortex inside a cavity in the airfoil. A multi-objective optimization study was carried out using a genetic algorithm to maximize the L/D and minimize the energy input (mass suction) with a constraint of fully attached flow. A NACA 0024 baseline airfoil was taken for the shape optimization of the cavity. A parametric study was also done to analyze the effects of uniform and distributed mass suction on the baseline airfoil and that with a cavity. It was observed that both mass suction and cavity shape play an equally important role in achieving the goal, and by optimizing the cavity shape, mass suction could be reduced and flow can be controlled by anchoring the vortex inside the cavity.

Journal of Applied Fluid Mechanics

The Journal of Applied Fluid Mechanics (JAFM) is an international, peer-reviewed journal which covers a wide range of theoretical, numerical and experimental aspects in fluid mechanics. The emphasis is on the applications in different engineering fields rather than on pure mathematical or physical aspects in fluid mechanics. Although many high quality journals pertaining to different aspects of fluid mechanics presently exist, research in the field is rapidly escalating.