Method and device for coping with FBO event and fan rotor supporting device

A fan rotor and event technology, which is applied to parts of pumping devices for elastic fluids, jet propulsion devices, gas turbine devices, etc., can solve the problems of high critical speed of low-pressure rotors, core captain, and distance from fan disk to 2# bearing Short and other questions

Pending Publication Date: 2022-07-08
AECC COMML AIRCRAFT ENGINE CO LTD
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Problems solved by technology

However, for some new models, the core engine is too long, resulting in too short a distance from the fan disk to the 2# bearing, and the critical sp

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  • Method and device for coping with FBO event and fan rotor supporting device

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Embodiment Construction

[0018] The present invention will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description to facilitate a full understanding of the present invention, but it is obvious that the present invention can be implemented in many other ways that are different from those described herein. Those skilled in the art can make similar promotion and deduction according to the actual application situation without violating the connotation of the present invention, so the content of this specific embodiment should not limit the protection scope of the present invention.

[0019] The following embodiments take a typical dual-rotor high bypass ratio turbofan engine as an example, the engine includes a high and low pressure dual rotor system, and the rotors are surrounded by a stator case. The low-pressure rotor mainly includes a fan, a booster stage and a low-pressure turbine, and is generally supported ...

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Abstract

The invention provides a method and device for coping with an FBO event and a fan rotor supporting device, and aims to reduce the critical rotating speed of a low-pressure rotor after the FBO event occurs. The device for coping with the FBO event comprises a first connecting part and a second connecting part which are connected between a fan disc and a fan shaft in parallel, the second connecting part is at least partially made of intelligent materials, and when a set first load limit is exceeded, the connecting rigidity of the second connecting part is reduced, and the second connecting part is elongated in the axial direction.

Description

technical field [0001] The present invention relates to a method, apparatus and fan rotor support apparatus for responding to FBO events in a turbofan engine. Background technique [0002] During the operation of the aero-engine, one or more fan blades may fall off due to unavoidable reasons such as foreign object inhalation and fatigue, that is, a fan blade-off event (FBO: Fan blade-off). FBO events can cause large shock and unbalanced loads on the fan rotor. According to the requirements of airworthiness regulations (FAR33.74, FAR33.94), such a fan blade falling off event requires airworthiness certification to ensure flight safety. [0003] The traditional approach is to increase the structural strength of key components on the engine's power transmission path, such as rotor support structures, load-bearing casings, and mounting systems, so that they have a high stress reserve margin to cope with FBO loads. However, this will lead to an increase in the weight of the eng...

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Application Information

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IPC IPC(8): F02C3/04F02C7/00F04D29/26F04D29/00F04D29/60
CPCF02C3/04F02C7/00F04D29/002F04D29/263F04D29/601Y02E10/72
Inventor 赵芝梅钱鹏王少辉
Owner AECC COMML AIRCRAFT ENGINE CO LTD
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