One possible method of reducing jet noise at take-off is the use of an ejector in which the propelling nozzle discharges into a shroud and thereby induces a secondary flow. The present report describes an experiment on the ...

In an aerodynamic nozzle a convergent primary nozzle is housed within an afterbody which is surrounded by a shroud. Part of the external flow is captured thereby and compressed by the under-expanded primary jet. At the ...