profile drag


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profile drag

[¦prō‚fīl ‚drag]
(fluid mechanics)
That part of the airfoil drag that results from the skin friction and the shape of the airfoil as indicated by the airfoil profile.

profile drag

profile drag
Streamlining reduces profile drag substantial.
The combined effect of form drag and skin friction. It is total drag less induced drag. It is a type of parasite drag that increases as the square of speed and is dependent on the shape of the body and its smoothness. See also form drag and skin friction.
References in periodicals archive ?
Acceleration or deceleration in the flow that moves around the cylinder causes significant change to the structure of the boundary layer and, correspondingly, change to the position of the point of boundary layer separation: during acceleration of the flow around the cylinder ([partial derivative]W/[partial derivative][tau]) > 0, the point of separation shifts backwards, causing a decrease in aerodynamic trail width and as a result profile drag caused by viscous forces in the flow (the coefficient of profile drag [C.sub.x] decreases); during deceleration in the flow ([partial derivative]W/[partial derivative][tau]) < 0, the point of boundary layer separation shifts forward, widening the aerodynamic trail behind the cylinder and increasing profile drag.
Wing drag was calculated as the sum of zero-lift drag, induced drag, wave drag, profile drag and interference drag.
It computes side-force lift, vortex drag, profile drag, weight, center of gravity location as measured from the root leading edge, center of gravity as measured vertically from root location, and other performance parameters.

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