DEVICE FOR COMBATING CRYSTAL ICING OF TURBOFAN ENGINES (TDCE) Russian patent published in 2024 - IPC F02C7/47 F02C9/00 B64D15/22 

FIELD: aviation technology.

SUBSTANCE: invention relates to the field of aviation technology, in particular to systems for protecting aircraft engines from crystalline icing. A device for preventing crystal icing of a turbojet dual-circuit engine contains a main pipeline for removing hot air from the stages of a high-pressure compressor and supplying it through a flap and pressure regulator installed on the specified pipeline to the leading edges of the air intake. The fan and the high-pressure compressor have speed sensors for the fan and the high-pressure compressor. The device additionally has another auxiliary pipeline running from the main pipeline, which provides hot air supply during crystal icing directly to the suction of the low-pressure compressor. The first and second shut-off valves are installed on the main and auxiliary pipelines accordingly, to which the shut-off valve control unit is connected, which ensures the operation of the valves in the opposite phase - when the first valve is open, the second valve is closed and vice versa. The shut-off valve control unit contains a crystal icing alarm module that compares the revolutions of the fan N1 and the high-pressure compressor N2 and, if a mismatch of the revolutions N1 and N2 is detected among themselves and their inconsistent response to the position of the ECL and in case of an unintentional decrease in the revolutions N1 by more than 30%, issues a signal to the switching module of the shut-off valve control unit to switch the positions of the shut-off valves from the main mode position - the first valve is open, the second is closed when hot air is supplied to the leading edges of the air intake, wings and tail, to the additional one - the first valve is closed, the second is open when the entire available flow rate the hot air is supplied directly to the suction of the low-pressure compressor.

EFFECT: technical result, which the invention aims to achieve, is to prevent crystalline icing of the blades of a low-pressure compressor by heating the air entering the compressor containing ice crystals to the melting temperature of these crystals.

1 cl, 1 dwg