Assessment of the aerodynamic characteristics of thick airfoils in high Reynolds and moderate Ma numbers using CFD modeling

The Science of Making Torque from Wind 2014

Prospathopoulos, John M.^1 ; Papadakis, Giorgos^1 ; Sieros, Giorgos^2 ; Voutsinas, Spyros G.^1 ; Chaviaropoulos, Takis K.^2 ; Diakakis, Kostas^1

Laboratory of Aerodynamics, Department of Mechanical Engineering, National Technical University of Athens, 9 Heroon Polytechniou Ave., 15780 Zografou, Athens, Greece^1

Wind Energy Department, Centre for Renewable Energy Sources and Saving, 19th km Marathonos Ave, 19009, Pikermi Attiki, Greece^2

关键词: Aerodynamic characteristics;    CFD modeling;    Compressibility effects;    High Reynolds number;    Lift and drag;    SST turbulence models;    Steady simulation;    Thick airfoils;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/524/1/012015/pdf
DOI  :  10.1088/1742-6596/524/1/012015

来源: IOP

【 摘 要 】

The aerodynamic characteristics of thick airfoils in high Reynolds number is assessed using two different CFD RANS solvers: the compressible MaPFlow and the incompressible CRES-flowNS-2D both equipped with the k-ω SST turbulence model. Validation is carried out by comparing simulations against existing high Reynolds experimental data for the NACA 63-018 airfoil in the range of -10° to 20°. The use of two different solvers aims on one hand at increasing the credibility in the results and on the other at quantifying the compressibility effects. Convergence of steady simulations is achieved within a mean range of -10° to 14° which refers to attached or light stall conditions. Over this range the simulations from the two codes are in good agreement. As stall gets deeper, steady convergence ceases and the simulations must switch to unsteady. Lift and drag oscillations are produced which increase in amplitude as the angle of attack increases. Finally in post stall, the average CLis found to decrease up to ∼24° or 32° for the FFA or the NACA 63-018 airfoils respectively, and then recover to higher values indicating a change in the unsteady features of the flow.