Jet engine thrust increasing device - has supplementary nozzle which surrounds split coned end of engine jet pipe

摘要

The jet pipe (2) of an aircraft jet engine has a convergent extension (9) with a half angle of about 9 deg. The walls of the extension have four equally spaced longitudinal slots (12). The slot width is about one third of the diameter (d) of the jet pipe (2) and the length (1) of the slots is about 1.4 times the dia. (d). A supplementary convergent nozzle is mounted immediately downstream of the convergent extension (9) and is of considerably larger diameter so that additional air is drawn in and ejected through the outlet (7). The slots (12) in the divergent extension increase the engine thrust considerably when compared with other types of jet engine nozzles.