Laminar skin friction drag just in region one, denoted as (Df,1)laminar, refers to the aerodynamic drag caused by friction between a laminar flow and the surface of a specific region 1 on an object, such as an airfoil or wing. This drag arises due to the shear stress between the relatively smooth and ordered layers of a laminar flow and the surface of the designated region. Laminar skin friction drag is influenced by factors such as the velocity gradient within the laminar boundary layer and the smoothness of the surface. It is a component of the total drag experienced by the object, which also includes other forms of drag such as pressure drag and induced drag.
- (Df,1)laminar: Laminar skin friction drag on region one
- q∞: Dynamic pressure of the freestream flow
- x1: Characteristic length of region one
- (Cf,1)laminar: Skin-friction drag coefficient under laminar flow conditions in region one