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In fluid dynamics, the drag coefficient (commonly denoted as: , or ) is a dimensionless quantity that is used to quantify the drag or resistance of an object in a fluid environment, such as air or water.
4 lis 2012 · The drag coefficient quantifies the drag or resistance of an object in a fluid environment. Any object moving through a fluid experiences drag - the net force in the direction of flow due to pressure and shear stress forces on the surface of the object. The drag force can be expressed as: Fd = cd 1/2 ρ v2 A (1) where.
20 lis 2023 · Comparing the flat plate and the prism, and the sphere and the bullet, we see that the downstream shape can be modified to reduce drag. A typical value for the drag coefficient of a model rocket is .75, based on the cross-sectional area of the rocket.
Drag coefficients, C D, for several bluff and streamline shapes are shown as a function of Reynolds number. The drag force, FD = CDA (rU2/2), depends directly on this quantity. For the flat plate normal to the flow, C D is independent of Reynolds number over the range shown because flow separation occurs at the sharp corners of the ...
The drag coefficient (non-dimensional drag) is equal to the drag force divided by the product of velocity pressure and frontal area. The velocity may be that of the object through the air (or any other gas) or the air velocity past a stationary object.
A quick comparison shows that a flat plate gives the highest drag and a streamlined symmetric airfoil gives the lowest drag, by a factor of almost 30! Shape has a very large effect on the amount of drag produced.
21 sty 2023 · For drag, this variable is called the drag coefficient, designated “Cd”. At the time of the Wright brothers, the drag coefficient was usually referenced to the drag of a flat plate of equal projected area. On another page we show some typical values for the drag coefficient.
