Drag coefficient - Wikipedia
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. It is used in the drag equation in which a lower drag coefficient indicates the object will have less aerodynamic or hydrodynamic drag.
Drag Coefficient - The Engineering ToolBox
2010年11月25日 · 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.
Drag Equation | Glenn Research Center | NASA
2024年7月15日 · For drag, this variable is called the drag coefficient, designated “ Cd.” This allows us to collect all the effects, simple and complex, into a single equation. The drag equation states that drag D is equal to the drag coefficient Cd times the density rho (ρ) times half of the velocity V squared times the reference area A. D = Cd ⋅ ρ⋅V2⋅A 2.
The coefficient of drag is a function of Reynolds number, Mach number, angle of attack, and form of the body. When the force is calculated from the coefficient of drag, it includes both the surface and form drag. The drag coefficient used to calculate the resisting force
The drag force on a body in a fluid flow is a function of the body size (expressed via a characteristic length, ) and the fluid velocity, , density, 𝜌, and viscosity, . Perform a dimensional analysis to reduce this to a single functional dependence 𝐷= (Re) where 𝐷 is a drag coefficient and Re is the Reynolds number.
Drag Coefficient | Glenn Research Center | NASA
2023年11月21日 · The drag coefficient is a number that engineers use to model all of the complex dependencies of shape and flow conditions on rocket drag. This equation is simply a rearrangement of the drag equation where we solve for the …
8.6: Drag Forces in Fluids - Physics LibreTexts
2022年7月20日 · The coefficient \(C_{D}\) is called the drag coefficient, a dimensionless number that is a property of the object. Table 8.1 lists the drag coefficient for some simple shapes, (each of these objects has a Reynolds number of order 104 ).
Drag Coefficient - Definition, Formula, Calculation, Uses, FAQs
When an object moves through a fluid, then to compute its resistance, the coefficient used is known as the Drag coefficient, denoted by C d. The coefficient of drag is dimensionless, which is helpful in calculating aerodynamic drag and the impact of shape, inclination and conditions of flow in aerodynamics.
Drag coefficient (friction and pressure drag) - tec-science
2020年5月31日 · Friction drag, pressure drag and parasitic drag can each be expressed with dimensionless parameters. These quantities are also known as drag coefficients. The meaning of these coefficients is quite analogous to other dimensionless similarity parameters such as Reynolds number, Prandtl number, Nusselt number, Schmidt number, Lewis number, etc.
Coefficients in Aerodynamic Engineering
2023年12月27日 · Drag coefficient is properly equated to a ratio of forces (total drag divided by [dynamic pressure times reference area]; this is what a proper dimensional analysis will produce), but it simplifies to a ratio of areas.