High-Alfa Aerodynamics with Separated Flow Modeled as a Single Nascent Vortex

15th Asian Congress of Fluid Mechanics

物理学;力学

Antony, Samuel B.^1 ; Mukherjee, Rinku^1

Dept. of Applied Mechanics, Indian Institute of Technology, Madras

600036, India^1

关键词: Aerodynamic characteristics;    High angle of attack;    High angles of attack;    Initial conditions;    Multiple solutions;    Separated flows;    Vortex filament;    Vortex lattice method;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/822/1/012005/pdf
DOI  :  10.1088/1742-6596/822/1/012005

学科分类：力学，机械学

来源: IOP

【 摘 要 】

A numerical iterative vortex lattice method is developed to study flow past wing(s) at high angles of attack where the separated flow is modelled using NY nascent vortex filaments. The wing itself is modelled using NX × NY bound vortex rings, where NX and NY are the number of sections along the chord and span of the wing respectively. The strength and position of the nascent vortex along the chord corresponding to the local effective angle of attack are evaluated from the residuals in viscous and potential flow, i.e. (Cl)visc- (Cl)potand (Cm)visc- (Cm)pot. Hence, the 2D airfoil viscous Cl- α and Cm- α is required as input (from experiment, numerical analysis or CFD). Aerodynamic characteristics and section distribution along span are predicted for 3D wings at a high angle of attack. Effect of initial conditions and existence of multiple solutions in the post-stall region is studied. Results are validated with experiment.