Passive Flow Control around NACA 0018 Airfoil Using Riblet at Low Reynolds Number

Authors : Emre GÜLER, Tahir DURHASAN, İlyas KARASU, Hurrem AKBIYIK

Pages : 2208-2217

Doi:10.21597/jist.897982

View : 52 | Download : 12

Publication Date : 2021-09-01

Article Type : Research Paper

Abstract :In this study, aerodynamic capabilities of NACA 0018 airfoil is numerically investigated by installing riblet on the suction side of airfoil. Numerical results were obtained by ANSYS Fluent using k-kl-kw transition model at Reynolds number of Re=100 000. Three different riblet airfoil configuration was performed at six different angles of attack (α=8°, 10°, 13°, 15°, 17° and 19°) and these results compared with the clean model. For M1 model the riblet was located at chord wise section of x/c=0.3 while it installed at x/c=0.7 for M2 model. For M3 model two riblets were used and they were located at both x/c=0.3 and x/c=0.7. Obtained numerical result show that the use of riblet remarkably affects the flow characteristics of airfoil. At α=8° the CL/CD value of M1 model is increased by 4.5% when compared to clean model. It is indicated that angle of attack at α=10o, lift coefficient is increased for all models with compared to clean model. Stall angle is delayed from α=13° to α=15° at M1 and M3 with compared to clean model and lift coefficient is increased about 37% because of the restriction of the laminar separation bubble and trailing edge separation.
Keywords : Low Reynolds Number, NACA 0018 airfoil, Riblet, Passive flow control

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