Preheating device for a fluid/fluid heat exchanger of an aircraft

摘要

An aircraft includes a heat exchanger between a first fluid that flows into the narrow pipes of the exchanger and that is able to contain solid elements that can melt, and, a second fluid to be cooled. The heat exchanger includes a device for preheating the first fluid upstream from the pipes of the exchanger, a number of pipes arranged in at least one plane that intersects the direction of flow of the first fluid, whereby the spacing between two adjacent pipes is suitable for retaining the solid elements of large dimensions and for allowing them to pass only when they have melted at least partially.

主权项

1. An aircraft that comprises:
a liquid-liquid heat exchanger between a first liquid fluid which is fuel that flows into a plurality of first pipes (22) of said exchanger and that is able to contain ice crystals that can melt, and a second liquid heat exchange fluid to be cooled; the first liquid fluid being canalized in a supply pipe (24); and a preheating device configured for preheating the first fluid upstream from the plurality of first pipes (22) of the exchanger, the preheating device being arranged in the supply pipe (24), the preheating device comprising
a plurality of second pipes (28) arranged in at least one plane that intersects a direction of flow of the first fluid, a spacing between two adjacent second pipes of the device for preheating being suitable for retaining the ice crystals having dimensions larger than the spacing and for allowing the ice crystals to pass only when the ice crystals have melted at least partially,at least two series of the plurality of second pipes (28), whereby the spacing between said plurality of second pipes (28) decreases from one series to the next in the direction of flow of the first fluid, andD being a diameter of the first pipes (22), the pipes of a last series of pipes of the pre-heating device are separated from one another by a distance greater than or at least equal to D.