Cooling system and method of aero-engine

Abstract

The invention provides a cooling system of an aero-engine. The cooling system comprises an intermediate case of the aero-engine, wherein the intermediate case comprises an inner ring, a middle ring and an outer ring which are sequentially increased in diameters, the inner ring is connected with the middle ring through a plurality of radially-extending inner culvert support plates, the middle ring is connected with the outer ring through a plurality of radially-extending outer culvert support plates, an air-lubricating oil heat radiator is arranged on at least one outer culvert support plate, or the at least one outer culvert support plate is replaced with the air-lubricating oil heat radiator, and the heat radiator comprises a heat radiation part as well as a lubricating oil inlet and a lubricating oil outlet which are communicated with the heat radiation part. The invention also provides a cooling method of the aero-engine, the air-lubricating oil heat radiator is arranged on the least one outer culvert support plate or the at least one outer culvert support plate is replaced with the air-lubricating oil heat radiator. According to the cooling system and method, the turbulent flow inhibition to airflows in outer culverts is reduced, and thus the influence to the propulsive efficiency of the aero-engine is reduced.

Description

technical field [0001] The invention belongs to the field of aero-engines, in particular to an aero-engine cooling system and a method thereof. Background technique [0002] The lubricating oil system is an important subsystem of the aviation turbofan engine. The heat generated by the main bearing of the engine during operation, the heat leaked from the sealed pressurized air into the bearing cavity, the heat transmitted by the wall of the bearing cavity and the pipeline wall, and the gears in the transmission The heat generated by friction is taken away by the lubricating oil, which causes the temperature of the lubricating oil to rise, so the lubricating oil must be cooled before it is used again. [0003] At present, the common lubricating oil cooling scheme for high bypass ratio turbofan engines is generally to use fuel lubricating oil radiators. The fuel oil radiator uses relatively low-temperature fuel to cool the high-temperature lubricating oil. After the fuel is he...

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Problems solved by technology

like figure 1 As shown, the first way is to install the air-lubricating oil radiator 20' in the outer channel behind the support plate of the intermediate casing 10, and this installation method makes the air-lubricating oil radiator in the air flow of the engine outer channel Among them, it will have the effect of turbulence and hindrance to the external ducted airflow, thus affecting the propulsion efficiency of the engine to a certain extent

The second installation method is to install the air-lubricating oil radiator 20" on the outer wall of the outer ring of the intermediate case 10, and at the same time set an adjustable valve on the inner wall of the outer ring of the intermediate case. The size of the opening and the size of the windward side in the state, the appropriate flow of the external duct airflow is led to the air-lubricating oil radiator for heat exchange and cooling, and then discharged out of the engine; although this installation method is equipped with an adjustable valve, only It needs to be opened when the air-lubricating oil radiator is working, but because part of the air is taken away, the loss of air flow in the external duct will also be reduced, and the propulsion efficiency of the engine will also be reduced, and the addition of adjustable valves will increase the complexity of the system. The design Increased difficulty

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