Once the airfoil has stalled it ceases to be an airfoil and becomes a drogue. You can model the drag based on it's cross section with respect to the incident airflow, but the concept of a lift coefficient is no longer valid.Antonio9393 said:Where can I find post stall airfoil data?
Post stall airfoil data refers to the aerodynamic characteristics of an airfoil (or wing) at high angles of attack, where the flow over the airfoil becomes separated and turbulent. This data is used to analyze the performance and stability of an aircraft during critical flight maneuvers, such as takeoff and landing.
Post stall airfoil data is important because it allows engineers and researchers to understand the behavior of an aircraft at high angles of attack, which can greatly affect its performance and safety. This data is used in the development and testing of new aircraft designs, as well as in the analysis of accidents or incidents involving aircraft stalls.
Post stall airfoil data is typically collected through wind tunnel testing, where a physical model of the airfoil is placed in a controlled airflow and measurements are taken to determine its aerodynamic forces and moments. Computational fluid dynamics simulations can also be used to gather this data by simulating the airflow over the airfoil at various angles of attack.
Post stall airfoil data typically includes parameters such as lift and drag coefficients, pitching moment coefficient, and pressure distribution over the airfoil. These parameters can vary significantly with changes in angle of attack, and are essential in understanding the behavior of the airfoil at high angles of attack.
Post stall airfoil data is used in aircraft design to optimize the performance and stability of an aircraft during critical flight conditions. By understanding how an airfoil behaves at high angles of attack, engineers can make design changes to improve its performance, such as adding leading-edge devices or altering the airfoil shape. This data is also used in the development of flight control systems and stall warning devices to enhance the safety of the aircraft.