Additional Features

Boundary Layer Characteristics

(Incompressible)

δ = boundary layer thickness
Cf = overall friction coefficient (Drag = Cf·q·b·c; where q=dynamic pressure, b=span, c=chord)
Rex = Local Reynolds Number = ρVx/μ
Re = Reynolds Number = ρVc/μ
Laminar: δ/x = 5.2 / √Rex Cf = 1.328 / √Re
Turbulent: δ/x = 0.37 / Rex0.2 Cf = 0.074 / Re0.2
(There are other thickness measures based on momentum, energy etc.)

Simple Compressibility Effects

Vequiv = Vtrue √σ
a = √(γRT) hence: a0 = √(γRT0) ≅ 1116.45 ft/sec
M = Vtrue / a


Page last updated on January 14, 2006

Copyright © 1991-2008, Graham Gyatt. All Rights Reserved.