Patent ID: 6427434
Filing Date: 2002-08-06
Classification: B64D,F02C,Y02T,Y10T

Abstract:
An air inlet cowl for a jet engine, particularly for an aircraft, said air inlet cowl being equipped, at the front, with means for deicing its leading edge and for this purpose comprising:a hollow leading edge delimiting an internal peripheral chamber which is closed by an internal partition, said internal partition being equipped with a trough-shaped duct directed toward the rear of said leading edge and open toward the periphery of said air inlet cowl; a pipe which can be connected, at its rear end which is the opposite end to said leading edge, to a pressurized hot air circuit and, at its front end toward said leading edge, to an injector injecting said pressurized hot air into said internal chamber; and a calibration piece made of a material resistant to high temperatures and forming part of the external surface of said cowl, to the rear of said leading edge, said piece closing off said trough-shaped duct and being pierced with at least two orifices to place said internal chamber in communication with the outside, said orifices being distributed at least roughly parallel to said leading edge and serving to calibrate the flow of pressurized hot air ejected by said trough-shaped duct, while deflecting away from said cowl the pressurized hot air jets resulting from the passage of said flow of hot air through said orifices, said orifices having an oblong shape and being oriented at least approximately longitudinally with respect to said cowl, wherein said orifices form an arrangement in which an area of each orifice depends on its position in said arrangement, the area varying according to an extent of lateral positioning of said orifice, wherein at least two pressurized hot air jets passing through two adjacent orifices have, downstream of said calibration piece, different inclinations with respect to said calibration piece, and wherein said piece extends longitudinally in said external surface of said cowl, toward the rear thereof, to act as thermal protection for said cowl with respect to said hot air jets passing through said orifices.