Title: Numerical study of the effect of suction at a compressible and high Reynolds number flow to control the flow separation over Naca 2415 airfoil

Authors: Esmaeel Fatahian; Ali Lohrasbi Nichkoohi; Hossein Fatahian

Addresses: Department of Mechanical Engineering, Islamic Azad University of Nour, Iran ' Department of Mechanical Engineering, Islamic Azad University of Nowshahr, Iran ' Department of Mechanical Engineering, Islamic Azad University of Nour, Iran

Abstract: This study focused on delaying and controlling the flow separation over Naca 2415 airfoil by finding the best slot location with the most effective suction velocity ratio and suction angle to apply suction at a compressible and high Reynolds number flow using computational fluid dynamics method. The results were obtained with two dimensional compressible Reynold-averaged Navier-Stokes equations, and the turbulence was simulated with k-ε RNG turbulence model. The results indicated that the most effective slot locations for applying suction were between 0.3 to 0.6 of the airfoil chord length. Also, it was found that the maximum value of the lift coefficient was obtained at an angle of attack of 16° on 0.3 of airfoil chord length and suction velocity ratio of 1.5. This value is about 55% compared to the case without suction, and thus the stall angle increased from 10° to 16°.

Keywords: compressible flow; suction; lift coefficient; drag coefficient; flow separation; computational fluid dynamics.

DOI: 10.1504/PCFD.2019.099598

Progress in Computational Fluid Dynamics, An International Journal, 2019 Vol.19 No.3, pp.170 - 179

Received: 13 Jul 2017
Accepted: 24 Dec 2017
Published online: 14 May 2019 *

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