Method for extinguishing fires from an aircraft and related...

B - Operations – Transporting – 64 – D

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Details

B64D 1/16 (2006.01) A62C 99/00 (2010.01) A62C 3/02 (2006.01)

Patent

CA 2320270

The present invention comprises supplying a liquid onto the source of a fire from an aircraft (7), wherein said liquid is supplied In the form of gas-droplet stream (8) obtained by dispersion in a gas flow and by acceleration of the dual-phase flow in a gas-dynamics nozzle (4). The pressure at the inlet of the nozzle (4) as well as the relative concentration of liquid in the dual-phase flow are selected according to conditions enabling the formation of a dual-phase low-dispersion and high-speed flow which has a high extinguishing-substance concentration and remains stable when submitted to interference. The fire-extinguishing device of the present invention comprises a liquid supply system (1), a gas supply system (2), a mixing chamber (3) for the gas and the liquid as well as a gas-dynamics nozzle (4), wherein all these members are arranged onboard an aircraft (7). The gas-dynamics nozzle supplies the liquid towards the aria of the fire source and is connected to a vessel through a duct. The mixing chamber (3) is further provided with a liquid dispersion system.

Cette invention consiste à envoyer un liquide sur la source d'un incendie depuis le bord d'un aéronef (7), ceci sous forme d'un jet de gaz et de gouttelettes (8) que l'on obtient par dispersion dans un flux de gaz et par accélération du flux à deux phases dans un éjecteur à dynamique des gaz (4). La pression du gaz à l'entrée de l'éjecteur (4) ainsi que la concentration relative du liquide dans le flux à deux phases sont choisies en fonction de conditions permettant de former un flux à deux phases à faible dispersion et à grande vitesse qui possède une concentration élevée en substance extinctrice et qui reste stable lorsqu'il est soumis à des perturbations. Ce dispositif d'extinction d'incendies comprend un système d'alimentation en liquide (1) et un système d'alimentation en gaz (2), une chambre de mélange (3) du liquide et du gaz, ainsi qu'un éjecteur à dynamique des gaz (4), ces éléments étant disposés à bord d'un aéronef (7). L'éjecteur à dynamique des gaz permet d'envoyer le liquide vers la zone d'origine de l'incendie et se trouve connecté à un récipient par l'intermédiaire d'une conduite. La chambre de mélange (3) est en outre équipée d'un système de dispersion du liquide.

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