DEFINITION:

The performances of the nozzles are strongly linked to the afterbody aerodynamics for supersonic aircraft. On fighters, modifications of the geometry of the nozzle are needed for the adaptation at very different flight conditions. On the botttail boundary layer separation can occur due to jet expansion or flight in incidence or sideslip. In order to reduce the jet noise, some shapes of nozzle can be used on transonic aircraft and solutions with ejector silencer are studied for supersonic aircraft. The reduction of IR signature is an important operational constraint and several techniques of mixing to reduce the jet temperature can be used. Vectored thrust is a means of controlling the aircraft stability or improving the manoeuvrability of the vehicle. Several systems are used (deflectors in the jet, rotation of the nozzle, wall injection inside the nozzle,…)

(Source: ACARE Domain 306)

SUBDOMAINS:

1. Computational Fluid Dynamics
2. Wind Tunnel Testing
3. Noise Reduction
4. Silencer
5. Afterbody
6. Flow separation
7. Infrared Signature