Transition and Drag Measurements on the Boulton Paul Sample of Laminar-flow Wing Construction PART I PART II PART III Joint Discussion

摘要

The minimum drags as measured in the two tunnels are in good agreement with each other, and also with theoretical predictions using the measured transition points over a range of Reynolds number of 2.5 to 15 millions.nA tunnel-flight comparison on a wing of this thickness designed for a moderate amount of laminar flow would be very valuable. If, as the present' results in the R.A.E. tunnel suggest, some relaxation of the waviness reo uirements may be possible on such wings, then there is a hope of present standards of construction attaining laminar flow on such sections without resort to filling. Transition phenomena need to be studied further in relation to waviness, and more attention needs to be paid to the form and number of waves in addition to the amplitude when considering means of reducing the curvature gauge readings.