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Numerical investigation of an airfoil under light dynamic stall

Grant number: 22/08567-9
Support Opportunities:Scholarships in Brazil - Master
Effective date (Start): September 01, 2022
Status:Discontinued
Field of knowledge:Engineering - Aerospace Engineering - Aerodynamics
Principal Investigator:William Roberto Wolf
Grantee:Lucas Feitosa de Souza
Host Institution: Faculdade de Engenharia Mecânica (FEM). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
Associated research grant:21/06448-0 - High-fidelity numerical simulations applied in unsteady aerodynamics, turbulence and aeroacoustics, AP.JP2
Associated scholarship(s):23/13599-0 - Study of numerical techniques for flow analysis and control of airfoils under dynamic stall, BE.EP.MS

Abstract

Dynamic stall occurs when a moving airfoil rapidly exceeds its static stall angle of attack. The outcome is an increase in the unsteady loads accompanied by large torsional forces and mechanical vibrations on the wing or blade. This condition has significant influence on the performance and fatigue of several mechanical systems, such as helicopter blades, wind turbines and flapping wing aerial vehicles. Hence, the study of dynamic stall on pitching airfoils is of paramount importance to predict the performance parameters. The process of dynamic stall is highly sensitive to flow conditions such as compressibility and inertial/viscous effects, rate of motion and airfoil geometry. The main objective of the present work is the study of airfoils under light dynamic stall for which negative aerodynamic damping occurs. In these cases, the structure absorbs energy from the unsteady aerodynamic flow. High fidelity numerical simulations will be conducted to investigate the effects of compressibility on aerodynamic damping and flow modal decomposition will be employed to understand the relevant frequencies associated with dynamic stall onset.

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