An air intake ventilation structure for aircraft auxiliary power system

Abstract

The invention discloses an air inlet ventilation structure used for an aircraft auxiliary power system. The structure comprises an aircraft auxiliary power system cabin (1) and an air inlet channel (2) which is formed in the aircraft auxiliary power system cabin. An auxiliary power system body (3) is arranged in the aircraft auxiliary power system cabin and communicates with the air inlet channel. A closed type annular guide channel (5) is formed in the inner wall of the aircraft auxiliary power system cabin. A cat ear air inlet (4) is formed in the aircraft auxiliary power system cabin and communicates with the guide channel. Diversion spray nozzles (6) are arranged in the positions, perpendicular to the aircraft auxiliary power system cabin, of the guide channel, are located at the side, close to the auxiliary power system body, of the guide channel, and communicate with the guide channel. According to the air inlet ventilation structure provided by the invention, a single cooling air inlet is changed into a plurality of cooling air inlets based on a prior air inlet ventilation structure, and flowing and heat exchanging in the auxiliary power cabin are optimized.

Description

technical field [0001] The invention belongs to the technical field of engine compartment ventilation and cooling, and in particular relates to an intake ventilation structure for an aircraft auxiliary power system. Background technique [0002] Aircraft Auxiliary Power Unit (APU-Auxiliary Power Unit) is actually a turbine engine with a smaller size than the main engine. It has its own compressor, combustion chamber, turbine and various systems. It has the advantages of small size, light weight, long life, Its self-starting time is short, it can output shaft power and compressed air at the same time, and it can work independently. The engine itself is a high-temperature component. When it is working, it transfers heat to the nacelle through the casing. Even if the surface is coated with oil and heat insulation coating, it may still cause high temperature in the section. If the engine nacelle does not have a reasonable structure and effective cooling, The high temperature in...

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Problems solved by technology

In addition, the area blocked by the wall surface of the inlet is prone to produce a recirculation zone, and the heat accumulates in the recirculation zone and cannot be discharged from the cabin

Furthermore, the single cat-ear air intake has the problem of uneven air intake in the circumferential direction, and the single cooling air intake can only enhance heat transfer to a specific position of the auxiliary power system, while the heat transfer effect in other areas is not obvious

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