For certain body shapes, the drag coefficient only depends on the Reynolds number , Mach number and the direction of the flow. For low Mach number , the drag coefficient is independent of Mach number.

2023年11月20日 · This page shows some typical values of the drag coefficient for a variety of shapes. The values shown here were determined experimentally by placing models in a wind tunnel and measuring the amount of drag, the tunnel conditions of velocity and density, and the reference area of the model.

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.

• Look at tables of drag coefficient for various objects (geometric shapes, parachutes, trees, people, buildings, etc.) • Do a “student-friendly” example problem – drag on a bicycle

2015年8月20日 · This image from NASA illustrates drag coefficients for several shapes: It is generally accepted that some variation of the teardrop/airfoil shape has the lowest drag coefficient. I was wondering ...

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 ). The above model for air drag does not extend to all fluids.

Air Flow Drag, Drag Coefficient Equation and Calculators for various shapes and bodies. The drag coefficient (non-dimensional drag) is equal to the drag force divided by the product of velocity pressure and frontal area.

2007年5月17日 · One way of expressing drag is by using drag coefficients. The drag coefficient is a dimensionless number used to represent the overall effects of shape, inclination, and other flow conditions. The drag coefficient is defined as follows: A one-dimensional balance was used to calibrate the load cell within the Wind Tunnel. Weights varying from 0.6 to

The drag coefficient (Cd) is equal to the drag (D) divided by the quantity: density (r) times reference area (A) times one half of the velocity (V) squared. This slide shows some typical values of the drag coefficient for a variety of shapes.

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 …