Reynolds-Number Dependency of Boundary-Layer Transition Location on Stratospheric Airship Model

Cd = drag coefficient of the airship model D = hull diameter of the airship model, m L = hull length of the airship model, m ReV = Reynolds number based on the cubic root of thevolume of the model U∞ = freestream velocity, m∕s urms = streamwise velocity fluctuation intensity, m∕s Xfr∕L = nondimensional axial length coordinate of sublimation front position Xtr∕L = nondimensional axial length coordinate at transition x = coordinate in freestream direction from hull nose, m y = coordinate in wall normal direction, mm z = coordinate in circumferential direction, mm α = angle of attack of the model, deg δ = boundary-layer thickness, mm