Back-stepping blade grid of aviation engine
A technology of aero-engines and blades, which is applied to the layout/installation of power devices, aircraft parts, power devices on aircraft, etc., and can solve problems such as large aerodynamic and thermal loads, low reverse thrust efficiency, and complex structures
Active Publication Date: 2016-02-17
AECC COMML AIRCRAFT ENGINE CO LTD
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[0003] Thrust reversers can be roughly divided into cascade-type thrust reversers, baffle door-type thrust reversers, and target-type thrust reversers according to the mechanism that generates reverse thrust. These three types of thrust reversers have their own advantages and disadvantages. The structure and motion mechanism of the thrust device are simple, but the weight is large and the aerodynamic and thermal loads are relatively large. It is generally used in the turbojet engine or the turbofan engine with a small bypass ratio; The thrust efficiency is relatively low; the cascade thrust reverser has the highest reverse thrust efficiency, but the structure is relatively complicated, and it is the main thrust reverse form currently used by turbofan engines with large bypass ratio
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[0041] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. Note that the aspects described below in conjunction with the accompanying drawings and specific examples are merely exemplary, and should not be construed as limiting the protection scope of the present invention.
[0042] figure 1 A typical turbofan aircraft engine including thrust reverser cascades is shown. Such as figure 1 As shown, the left side of the figure is the forward direction of the aircraft, as shown by the solid straight arrow. In normal flight, after the engine sucks in air, the airflow is discharged from the tail end of the engine backwards, thus providing forward thrust for the aircraft. A reverse thrust cascade device surrounds the circumferential direction of the engine. When the aircraft wishes to decelerate, the air outlet at the tail end of the engine is closed, and the reverse thrust cascade is exposed at the same t...
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The invention provides a back-stepping blade grid of an aviation engine. The back-stepping blade grid comprises a plurality of blades. The plurality of blades are axially arranged at intervals surrounding a circumference of the aviation engine; each blade is formed by an inlet section and an outlet section; through holes are formed in at least one part of the plurality of blades; through hole inlets are placed on a blade basin of the outlet section; and through hole outlets are arranged on the tail end surface or a blade back of the outlet section.
Description
technical field [0001] The invention relates to a thrust reverser of an aero-engine, in particular to a thrust-reverse cascade of an aero-engine. Background technique [0002] In order to shorten the landing distance of the aircraft, almost all civil aircraft use a thrust reverser to decelerate. Compared with the deceleration of the wheel brake device, the thrust reverser can shorten the landing distance of the aircraft by nearly 65%. The working principle of the thrust reverser is to turn the direction of the normal air flow in the engine by more than 90°, so as to generate thrust in the direction opposite to the normal thrust, so as to achieve the purpose of decelerating the aircraft. Generally speaking, since the turning of the airflow cannot reach 180°, the reverse thrust is about 30% of the forward thrust. [0003] Thrust reversers can be roughly divided into cascade-type thrust reversers, baffle door-type thrust reversers, and target-type thrust reversers according to...
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IPC IPC(8): B64D33/00
Inventor 张建东陈俊
Owner AECC COMML AIRCRAFT ENGINE CO LTD