For aircraft or projectiles, drag is one of the four aerodynamic forces that determine the motion of an object, but it also acts to slow down a moving automobile or lamina moving through a fluid.ĭrag is related to the relative velocity between the fluid surrounding a moving object. Drag in Aerodynamicsĭrag is one of the main forces acting on an object that will move through a fluid. Reynolds number is important for understanding the operating limits of a vehicle, aircraft, or other object that will move through a fluid. Because flow behavior is summarized in both regimes, the relationship between the drag coefficient vs. The relationship between the drag force and an object’s motion is summarized in terms of a drag coefficient, while the flow regime is summarized in terms of the Reynolds number. In each regime, the possible flow characteristics will be different, thus the amount of drag experienced by a moving object might be quite different in each regime. The drag force will then determine the amount of force required to maintain motion, thus it is normally preferable for an object to generate as little drag as possible during its motion.įluid flow occurs primarily in two regimes: laminar and turbulent. Any object moving through a fluid, or conversely fluid moving across a stationary object, will generate or experience a drag force that resists its motion. When we talk about drag, we are not only referring to the force acting on aircraft. ![]() ![]() Measuring the drag coefficient of an automobile Turbulent flow, where the Reynolds number is large, will create more drag on a moving object compared to laminar flow. The relationship between drag and the velocity of the surrounding fluid is summarized in terms of a drag coefficient.īecause the flow rate also determines the Reynolds number, it is important to investigate the relationship between the drag coefficient vs. Drag is one of the four primary aerodynamic forces acting on an object that moves through a fluid.
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