Negative lift characteristics of NACA 0012 aerofoil at low Reynolds numbers
- 37 Downloads
Numerical investigations on the flow over NACA 0012 aerofoil are carried out to provide better understanding of the unusual lift characteristics exhibited by this aerofoil at low Reynolds numbers. Computations are carried out at Re = 10,000–100,000, for different values of angles of attack and freestream turbulence intensity. There exists a narrow range of these parameters where the net circulation around this symmetrical aerofoil is negative, leading to the generation of negative lift at positive angles of attack. Different flow regimes are identified and physical explanations are given for this unusual behaviour of negative lift, and the influence of different flow parameters is discussed.
KeywordsNACA 0012 aerofoil low-Reynolds-number flows flow separation transition laminar separation bubble negative lift
- 2.Ohtake T, Nakae Y and Motohashi T 2007 Nonlinearity of the aerodynamic characteristics of NACA0012 aerofoil at low Reynolds numbers. J. Jpn. Soc. Aeronaut. Space Sci. 55: 439–445Google Scholar
- 3.Tank J, Smith L and Spedding G R 2017 On the possibility (or lack thereof) of agreement between experiment and computation of flows over wings at moderate Reynolds number. Interface Focus 7: 1–15Google Scholar
- 4.Yonemoto K, Takato K, Ochi H and Fujie S 2008 Kutta condition violation in two-dimensional NACA0012 airfoil at low Reynolds number. AIAA Paper 2008-6399 Google Scholar
- 10.Selig M S, Guglielmo J F, Broern A P and Giguere P 1996 Experiments on airfoils at low Reynolds numbers. AIAA Paper 96-0062 Google Scholar