Nozzles for pyrophoric ir decoy flares

F - Mech Eng,Light,Heat,Weapons – 42 – B

Patent

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F42B 12/70 (2006.01) F42B 4/26 (2006.01) F42B 5/15 (2006.01)

Patent

CA 2237810

A decoy flare for infrared (~R) seeking missiles comprises a tubular shell with a cover member hermetically sealed to an outer front edge of the tubular shell to form a container for a pyrophoric liquid. The cover member has a central rupturing disc that ruptures at a predetermined pressure, a nozzle cap with a nozzle opening being attached to the cover member adjacent an exterior surface of that rupturing disc. Pressure applied by a mechanism to the pyrophoric liquid can rupture the rupturing disc and eject the pyrophoric liquid through the nozzle. A pre-heating chamber formed by an enclosure surrounds the nozzle opening in order to provide for more reliable ignition of the pyrophoric liquid at high altitudes and low flow rates, that enclosure having an outer surface containing a number of perforations through which air can enter the pre-heating chamber and through which pyrophoric liquid can be ejected from the chamber into the atmosphere.

Leurre thermique pour missiles à guidage infrarouge ( R) comprenant une enveloppe tubulaire avec un couvercle hermétiquement fermé sur le rebord frontal extérieur de l'enveloppe tubulaire pour former un contenant de liquide pyrophorique. Le couvercle est équipé d'un disque de rupture central qui se brise à une pression prédéterminée, d'une ouverture de buse fixée au couvercle et située à proximité de la surface extérieure du disque de rupture. Une pression appliquée par un mécanisme au liquide pyrophorique entraîne la rupture du disque et l'éjection du liquide pyrophorique par la buse. Une chambre de préchauffage formée par une enceinte entoure l'ouverture de la buse afin d'assurer une inflammation plus fiable du liquide pyrophorique à haute altitude et à des débits plus faibles; l'enceinte possède une surface extérieure comportant un certain nombre de perforations qui permettent à l'air d'entrer dans la chambre de préchauffage et par lesquels le liquide peut être éjecté dans l'atmosphère.

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