Downwash velocity refers to the downward component of the velocity field that results from the lifting action of a finite wing. As an aircraft wing generates lift, it creates a disturbance in the airflow, leading to a downward movement of air behind the wing, known as downwash. This phenomenon is crucial for understanding the lift distribution along the span of a wing and is essential in finite wing theory for calculating induced drag and the overall aerodynamic performance of wings.
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