A thermal system for continuous monitoring of laminar and turbulent boundary-layer flows during routine flight

Norman R. Richardson, Elmer A. Horton
Sep 1957

A thermal system has been developed which could be used to determine whether the boundary layer on a wing in flight is turbulent or laminar. This system, when used in conjunction with continuous recording instruments such as the galvanometer in an NACA VGH recorder and a motor-driven selector switch, would permit continuous monitoring of the boundary layer during routine flight with little or no attention from the crew.

An Adobe Acrobat (PDF) file of the entire report: