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Numerical Study of Flow Separation Control by Tangential and Perpendicular Blowing on the NACA 0012 Airfoil
Kianoosh Yousefi, S. Reza Saleh, Peyman Zahedi
Pages - 10 - 24     |    Revised - 15-01-2013     |    Published - 28-02-2013
Volume - 7   Issue - 1    |    Publication Date - April 2013  Table of Contents
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KEYWORDS
Blowing, Blowing Amplitude and Coefficient, Flow Control, NACA 0012 Airfoil, Lift and Drag Coefficients.
ABSTRACT
In this study, tangential and perpendicular steady blowing at the trailing edge of NACA 0012 airfoil is investigated numerically to flow separation control and to study the effects of blowing amplitude and blowing coefficient on airfoil aerodynamic characteristics. Flow was fully turbulent with the Reynolds number of 5105 and the turbulent employed model was the Menter’s shear stress model. Blowing on airfoil is modeled in tangential (tangential blowing) and perpendicular (perpendicular blowing) form and length of blowing jet is 3.5 percent of chord length. Considering previous studies, blowing jet is optimum in two distances on the airfoil surface, one around 40 percent and the other around 80 percent of chord length from the leading edge, which in this study blowing jet is placed at 80 percent of the chord length from the leading edge. Blowing velocity from 0.1 to 0.5 is considered of freestream velocity. Results of tangential blowing show that by increasing amplitude of blowing, lift and drag coefficients changes are inconsiderable. Maximum increase of lift to drag ratio in amplitude of 0.5, around 16.5 percent, but in perpendicular blowing lower amplitude of blowing is more appropriate. Also tangential blowing has no effect on stall angle and cause gradual stall of NACA 0012 airfoil, whereas perpendicular blowing improve stall angle from 14 to 16 degrees.
CITED BY (7)  
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Mr. Kianoosh Yousefi
Department of Mechanical Engineering Islamic Azad University, Mashhad Branch Mashhad, 91735-413 - Iran
kianoosh_py@yahoo.com
Associate Professor S. Reza Saleh
Department of Mechanical Engineering Islamic Azad University, Mashhad Branch Mashhad, 91735-413 - Iran
Mr. Peyman Zahedi
Department of Mechanical Engineering Islamic Azad University, Mashhad Branch Mashhad, 91735-413 - Iran