Jet propulsion power plant

Claim 1

Jet propulsion power plant for aircraft, comprising a duct containing in flow-series a compressor, a combustor, a turbine connected to drive the compressor, and a first primary jet nozzle, and further comprising a second duct connected to the first duct to be fed with pressure fluid therefrom, and terminating in a plurality of secondary jet nozzles, said second duct being connected to the first duct at a point in the vicinity of the compressor where pressure is sufficiently high in relation to the individual secondary nozzles to produce from the secondary nozzles individual and distinct jet flows having a noise spectrum which has its peak at an ultrasonic frequency, said secondary nozzles including a plurality of combustion chambers having an outlet for combustion products and comprising a center body of substantially rectangular form, as seen in the general direction of flow through the outlet, and discharge passages for the combustion products arranged at the long sides of the said form, the center body being hollow and having interior surfaces defining a space open to ambient air at, at least, one of the short sides of said form and at the downstream end of the center body.