Variable cycle engine with high bypass ratio

Abstract

The invention relates to a variable cycle engine with a high bypass ratio. The variable cycle engine comprises a front fan (1), a booster stage (2), a high-pressure compressor (3), a combustor (4), a high pressure turbine (5), a low-pressure turbine (6) and a tail pipe nozzle (9), wherein the high-pressure compressor (3) and the booster stage (2) are respectively driven by the high pressure turbine (5), the low-pressure turbine (6) and the exhaust nozzle (9) through a high pressure shaft (8) and a low pressure shaft (9); a rear fan (10) is arranged between the booster stage (2) and the high-pressure compressor (3), the revolving speed of the rear fan (10) is between the revolving speed of the booster stage (2) and the revolving speed of the high-pressure compressor (3), and a plurality of first bypass valves (12) and corresponding bypass channels are arranged on the outlet of the rear fan (10). The air current matching of engine parts can be improved by additionally setting the rear fan between the booster stage and the high-pressure compressor, and bypass valves capable of being opened or closed are arranged on the outlet of the rear fan, so that the bypass ratio of the engine can be changed so as to be applied to the requirements of different power states.

Description

technical field [0001] The invention relates to the field of gas turbine engine structure design, in particular to a large bypass ratio variable cycle engine. Background technique [0002] Such as figure 1 As shown in FIG. 1 , it is a structural schematic diagram of an existing common high bypass ratio turbofan engine. According to the axial flow direction a of the air flow, the structure consists in sequence of a large-sized front fan 1, a booster stage 2, a high-pressure compressor 3 for compressing the air flow entering the core engine, a combustion space for supplying a mixture of fuel and compressed air The combustion chamber 4, the high-pressure turbine 5 and the low-pressure turbine 6 rotated by the propelling airflow, and the tail nozzle 7 for the high-speed ejection of the turbine outlet airflow, the propelling airflow passes through the high-pressure shaft 8 and the low-pressure shaft 9 respectively, driving the high-pressure compressor 3 and booster Level 2. ...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to propose a large bypass ratio variable cycle engine, which can solve the problem of airflow matching of engine parts in the variable cycle structure of a large bypass ratio turbofan engine

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