Abstract: In order to reduce the surface of a support mast (2) of an aircraft engine in contact with the hot exhaust gases (18) of said engine, a vortex-generating device (24) is positioned on the surface of the mast (2), near the hot region (22). Thus, the vortex generated in the flow of cold gases (16) crosses the hot air and modifies its path, thus preventing it from reaching zones (22) of the mast that are not predefined. This system makes it possible to adapt to the operating conditions of an already-built aircraft, without any notable increased weight.