Boundary layer control systems.

摘要

A boundary layer control system is provided which comprises a surface (10), several heater elements (11) lying substantially flush with the surface (10) for heating the boundary layer and several cooling elements (12) lying substantially flush with the surface (10) downstream of the heater elements (11). The arrangement is such that boundary layer flow passing over the heater elements (11) is locally heated and thus destabilised and when passing over the cooling elements (12) the heat flux is directed towards the surface. In this way transition delay of the boundary layer is effected. <IMAGE>