Comparative study of flow separation control using suction and blowing over an airfoil with/without flap

Abstract

This study mainly focused on the comparison of the effect of single and simultaneous suction and blowing jets on the aerodynamic performance of an airfoil with/without flap to evaluate the most effective flow control configuration using computational fluid dynamics (CFD) method. Moreover, the effect of applying single and simultaneous jets have been conducted on delaying and controlling the flow separation. The results were obtained using two-dimensional incompressible Unsteady Reynolds-Averaged Navier-Stokes (URANS), and the turbulence was simulated with SST k-x turbulence model. Also, different parameters including two jet locations (L jet), three jet velocity ratios (R jet), three jet angles (h jet) and three flap deflections (d f) were analyzed to find the most effective case of applying flow control jets to delay the boundary layer separation. It was concluded that applying a single suction jet and simultaneous suction and blowing jets on the flapped airfoil was more effective to improve the lift-to-drag ratio (C L /C D) than applying these jets to the without flap case. The maximum value of C L /C D was achieved by single suction jet for the without flap case which was equal to 73.7. The maximum increment of stall angle over the without flap airfoil and flapped airfoil was obtained by applying single suction jet, which increased the stall angle from 14°to 20°and 14°to 16°for the suction angle of-90°a nd suction velocity ratio of 0.15, respectively.

Film cooling modeling of a gas turbine blade by considering different injection holes with and without opening angles through CFD

“…Yk and Yω denote the dissipation of k and ω, respectively. Dω is the crossdiffusion term of ω [36,37].…”

Numerical Study of Aerodynamic Performance of Airfoil with Variable Curvature Split Flap

“…Unlike the passive control methods, the active control methods are more flexible because they can be adjusted according to the actual situation. The corresponding techniques mainly include blowing and sucking in the boundary layer (Zhang et al 2017;Fatahian et al 2019), synthetic jet (Feero et al 2017;Velasco et al 2017), adding plasma generator near the leading edge of airfoil (Post and Corke 2006;Bénard et al 2009) and so on.…”

Simultaneous Effect of Suction and Cavity for Controlling Flow Separation on NACA 0012 Airfoil – CFD Approach

“…The flow separation control techniques have been considered as a significant field of fluid mechanics [7][8][9][10]. The flow separation control can be achieved employing active methods for example; blowing and suction jets [11][12][13][14], and synthetic jet actuators [15][16][17], or passive methods such as flap, slat, vortex generator, and Gurney flap [18][19][20][21]. Flow simulation around the airfoil up to pre-stall and stall range continues to be a challenging problem and requires experimental results to determine the actual behavior of the flow.…”