Moments will also be produced on the body.Ī body in a flow will produce three integrated forces and three moments. The magnitude of the lift and drag forces depends on many factors, including the size and shape of the body and its orientation to the flow, as well as the Reynolds number (based on a characteristic length) and free-stream Mach number. By definition, the component of this force that acts on the body in a direction perpendicular to the relative free-stream velocity or “relative wind direction” is called the lift, as shown in the figure below. The force component on the body in a direction parallel to the relative wind direction is called the drag. Any body shape that is moved through a fluid will create some form of fluid-dynamic force upon it. Understanding the aerodynamic behavior of airfoils and wings is a significant part of the practice of aerospace engineering, and this understanding is critical to the successful design of all aircraft. 25 Aerodynamics of Airfoil Sections Introduction
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