Original scientific paper

https://doi.org/10.17559/TV-20160225100019

Aerodynamic characteristics of low Reynolds number airfoils

Mostafa Abobaker ; University of Belgrade, Faculty of Mechanical Engineering, Kraljice Marija 16, 11120 Belgrade 35, Serbia
Zlatko Petrović ; University of Belgrade, Faculty of Mechanical Engineering, Kraljice Marija 16, 11120 Belgrade 35, Serbia
Vasko Fotev ; University of Belgrade, Faculty of Mechanical Engineering, Kraljice Marija 16, 11120 Belgrade 35, Serbia
Noureddine Toumi ; University of Belgrade, Faculty of Mechanical Engineering, Kraljice Marija 16, 11120 Belgrade 35, Serbia
Ivana Ivanović orcid.org/0000-0002-3888-664X ; Innovation Center of the Faculty of Mechanical Engineering, Kraljice Marija 16, 11120 Belgrade 35, Serbia

Abstract

Assessment of airfoil aerodynamic characteristics is essential part of any optimal airfoil design procedure. This paper illustrates rapid and efficient method for determination of aerodynamic characteristics of an airfoil, which is based on viscous-inviscid interaction. Inviscid flow is solved by conformal mapping, while viscous effects are determined by solving integral boundary layer equations. Displacement thickness is iteratively added to the airfoil contour by alternating inviscid and viscous solutions. With this approach efficient method is developed for airfoil design by shape perturbations. The procedure is implemented in computer code, and calculation results are compared with results of XFOIL calculations and with experiment. Eppler E387 low Reynolds number airfoil and soft stall S8036 airfoil are used for verification of developed procedure for Reynolds numbers 200000, 350000, and 500000. Calculated drag polars are presented in this paper and good agreement with experiment is achieved as long as small separation is maintained. Calculated positions of laminar separation, reattachment, and turbulent separation closely follow experimental measurement. The calculations are performed in relatively short time, which makes this approach suitable for low Reynolds number airfoil design.

Keywords

airfoil design; boundary layer features; computational aerodynamics, conformal mapping; laminar separation bubble; low Reynolds number

Hrčak ID:

174707

URI

https://hrcak.srce.hr/174707

Publication date:

10.2.2017.

Article data in other languages: croatian

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