De-icing device comprising means for detection of a leakage in a hot air supply system

摘要

A device for defrosting a leading edge of an aircraft, includes at least one opening (52) for ejecting hot air, a pipe (56) for directing the hot air from a power plant to the ejection opening (52), and elements (58) for measuring the pressure inside the pipe (56), characterized in that the pipe (56) includes at least one cross-section reduction called a chokepoint (62) upstream from the elements (58) for measuring pressure.

主权项

1. A device for defrosting a leading edge of an aircraft, comprising:
at least one ejection opening (52) for ejecting hot air; a pipe (56) for directing the hot air from a power plant to said ejection opening (52); a pressure measuring device (58) inside said pipe (56); at least one cross-section reduction of said pipe (56) called a chokepoint (62) upstream from the pressure measuring device (58), a normal pressure being high upstream from said chokepoint (62) and low downstream; and a leak detector comprising said chokepoint (62) and said pressure measuring device (58), which allows leak detection by an enhanced pressure variation relative to the low normal pressure downstream from said chokepoint, the enhanced pressure variation being detected by the pressure measuring device (58), a specific position of the chokepoint relative to the pressure measuring device being configured so that the pressure variation produced by a leak is significant and detectable by the pressure measuring device relative to the normal operating pressure, wherein the chokepoint (62) has a cross-section (S′) that is larger than a total cross-section (S) of the at least one ejection opening (52), the cross-section (S′) of the chokepoint (62) is equal to the ejection cross-section (S) that is increased by a cross-section that corresponds to a margin and to pressure drops that are present in the pipe (56) between said chokepoint (62) and the at least one opening (52), and a sonic impact appears at the chokepoint (62) so that the leak detector detects the enhanced pressure variation relative to the low normal pressure downstream from said chokepoint (62), and the sonic impact is dissipated by the time the sonic impact reaches the at least one ejection opening (52) such that there is no sonic impact at the least one ejection opening (52).