A double-external engine

Abstract

The present invention provides a dual-external engine, which includes an inner duct, a first outer duct and a second outer duct; the first guide vane includes a first fan guide located before the inner duct and the first outer duct. A vane and a first tip fan guide vane located at the second outer duct; the second guide vane includes a second fan guide vane located at the inlet of the inner duct and a second vane located at the first outer duct Tip fan guide vanes; the first fan guide vane, the first tip fan guide vane, the second fan guide vane and the second tip fan guide vane can be adjusted independently, so that the suction of the inner and outer ducts can be matched and adjusted. It can realize the flexible distribution of internal and external flow of the engine, and support the free switching of the cycle mode of the engine under different tasks. The invention adopts the method of independent adjustment of the segmented guide vanes, which can reduce the internal and external flow adjustment structures, reduce the design complexity of the engine, and can reduce the airflow mixing among multiple ducts inside the engine and the caused by airflow mixing. flow loss.

Description

technical field [0001] The invention relates to the field of aeroengines, in particular to a double-external engine. Background technique [0002] With the continuous increase in the complexity of combat missions and the continuous expansion of the flight envelope, aeroengines need to have multiple power functions and higher propulsion efficiency, so that the overall performance of the engine in the full flight envelope is the best. [0003] Traditional fixed bypass ratio aeroengines can only have good performance in a limited flight range. For example, the supersonic performance of the turbojet engine is better, the unit thrust is large, and the fuel consumption rate is low when flying at a high Mach number; the turbofan engine has good subsonic performance, and the fuel consumption rate is low when flying at a low Mach number. By adjusting the parameters of the engine bypass, the variable cycle engine can have both high-altitude, high-speed, high-thrust and low-altitude, ...

AI Technical Summary

Problems solved by technology

[0008] 1) Passive deflation adjustment structures such as mode selection valves and front duct ejectors are mostly used, which are limited by the compression capacity of the rotating blades, and the active distribution capacity of inner and outer duct flows is weak, which limits the range of change in duct ratio

[0009] 2) The three-outside configuration is widely used, which increases the airflow mixing between multiple ducts inside the engine and the flow loss caused by airflow mixing, and the structure of the engine is complex, and the structural design is difficult, which limits the practical application and develop

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