Parametric Study of Aerodynamic Performance of an Airfoil with Active Circulation Control using Leading Edge Embedded Cross-Flow Fan

摘要

M A Qayyum Mazumder$1Snorri Gudmundsson$1Vladimir V. Golubev$1 $1Embry-Riddle Aeronautical University, Daytona Beach, FL, 32114, USA; ;;; A concept of a cross-flow fan (CFF) embedded near the leading edge of an airfoil to actively control the boundary layer for lift enhancement is thoroughly examined in this parametric study. The proposed design places a cross-flow fan near the leading edge of an airfoil and flow is drawn in from the pressure side of the airfoil, energized and expelled out to the suction side near the leading edge. Effectively, such CFF system provides an airfoil active circulation control (ACC) through suction-side blowing. ANSYS Fluent software is employed to perform 2D calculations. The effects of the number of blades, pressure side slat opening, suction side slat angle, hub-to-shroud ratio and blade pitch angle have on aerodynamic parameters are investigated. A non-linear regression model is established using the acquired data to find the maximum lift gain for the chosen set of parameters. The unsteady sliding mesh method is used to conduct numerical simulations. The fan geometry is developed and housed in NACA 65_1-212 airfoil. The results of CFD analysis show that the jet leaving the fan energizes the boundary layer of the airfoil suction side with the wall-jet flow of rather high velocity. This causes significant increase in the pressure difference between the suction and the pressure sides, thus generating additional lift in the established ACC process. Furthermore, the net drag of the airfoil is also eliminated, with the net thrust observed in the conducted simulations.