A core nacelle for cooling air intake self-regulating helicopter engine based on one-way memory alloy

Abstract

The invention discloses a cooling gas inflow self-adjusting engine core engine room based on a one-way memory alloy. The cooling gas inflow self-adjusting engine core engine room is characterized in that multiple openings are formed in the wall faces of the engine room. Each opening is covered with a flaky memory alloy piece. One edge of each flaky memory alloy piece is welded to the corresponding inner wall face of the engine core engine room, and the other edges of each flaky memory alloy piece are suspended. At the normal temperature, the flaky memory alloy pieces are flat and straight and are attached to the corresponding inner wall face of the engine room. After the temperature is increased, the flaky memory alloy pieces are bent towards the inner portion of the engine room, and the higher the temperature is, the larger the bending angles are and the larger the openings in the wall faces of the engine room are. The openings distributed in the upper wall face of the engine core engine room are used for inflow of helicopter rotor underwashing gas flow; and the openings distributed in the side wall faces of the engine room are used for inflow of cooling gas in the helicopter forward flight process. By the adoption of the engine room, the requirements for cooling the engine core engine room in the helicopter forward flight state and the helicopter hovering state can be met at the same time, the structure is simple, the weight of a helicopter is not increased, and negative effects on the performance of the helicopter are small.

Description

technical field [0001] The invention relates to a core cabin of an air intake self-adjusting helicopter engine based on a one-way memory alloy, and belongs to the technical field of design of the core cabin of a helicopter engine. Background technique [0002] In the helicopter system, the power compartment of the engine is the hottest part in the whole helicopter. In the power compartment, there are not only the engine and casing, but also engine control, lubricating oil, bleed air and other transmission accessories. The temperature of the engine core cabin will directly affect the safe and stable operation of these accessories. If the temperature of the engine core cabin is too high, on the one hand, various accessories in the engine core cabin may not work normally, and on the other hand, it may cause engine core cabin. A fire broke out, which seriously threatened the flight safety of the helicopter. Therefore, effective cooling must be used for the engine core cabin so...

AI Technical Summary

Problems solved by technology

The ejection system that uses the kinetic energy of the engine exhaust is connected to the end of the engine core cabin. The ejection system not only sucks a large amount of ambient air to reduce the exhaust temperature, but also sucks the air in the engine core cabin to make the air flow in the engine core cabin increase the cooling air volume in the engine core nacelle, but the ejection system will increase the weight and complexity of the entire engine system

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