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Active suppression method for chatter of engine compression system component

A compression system and active suppression technology, which is applied in the direction of machines/engines, liquid fuel engines, pumping devices for elastic fluids, etc., can solve the problem of reducing the stable working range of various engine components and difficult aeroelastic risk elimination , affecting the life of the engine and other issues, to achieve the effect of reducing the risk of flutter, improving the stability of flutter, and improving the problem of flutter

Active Publication Date: 2021-08-20
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to completely eliminate aeroelastic risks such as flutter at the design stage, especially for civil fans with large bypass ratios
The flutter boundary often appears within the aerodynamic boundary. Although flutter does not appear in all speed conditions, the erosion of the aerodynamic boundary by the local flutter boundary will greatly reduce the stable working range of the engine components.
With blade wear, dust accumulation, icing and other phenomena, the high-load common working line is likely to enter the flutter boundary, affecting the life of the engine and threatening flight safety.

Method used

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  • Active suppression method for chatter of engine compression system component
  • Active suppression method for chatter of engine compression system component
  • Active suppression method for chatter of engine compression system component

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Embodiment Construction

[0034] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are some, but not all, embodiments of the present invention, and are intended to explain the present invention, but should not be construed as limiting the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0035] In order to avoid flutter problems that threaten flight safety during engine operation, the present invention provides a flutter suppression method for compression system components that are prone to flutter problems, mainly based on blade tip / casing deflation, and in conjunction w...

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Abstract

The invention belongs to the technical field of aero-engine compression systems, and relates to an active suppression method for chatter of an engine compression system component. The method is mainly based on blade top / casing deflation, is matched with non-contact blade vibration monitoring, reduces the chatter generation area on the basis of not changing the original blade profile, widens the safe working range of an engine, so that the chatter problem of the compression system component is well solved, the chatter risk is reduced, and the influence on aerodynamic performance is very small due to the fact that the deflation amount only accounts for 1% or below of the total flow generally. Further, the influence on the pneumatic performance can be further reduced by selecting a deflation structure capable of being actively opened and closed.

Description

technical field [0001] The invention belongs to the technical field of aero-engine compression systems, and relates to a flutter suppression method for engine compression system components, in particular to an active suppression method for aero-engine compression system component flutter, which can better improve the flutter problem of compression system components , reduce the risk of flutter, and have little impact on the aerodynamic performance of the system. Background technique [0002] Aeroengine blade flutter is an aeroelastic instability phenomenon that needs to be avoided during flight. This phenomenon often occurs in compression system components such as fans and low-pressure compressors. Flutter can cause high-cycle fatigue of blades even in a short period of time. cause leaf breakage. It is difficult to completely eliminate aeroelastic risks such as flutter at the design stage, especially for civil fans with large bypass ratios. The flutter boundary often appea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/66F04D27/00F04D27/02F04D29/26F04D29/40F02C9/18
CPCF04D29/668F04D27/001F04D27/0207F04D29/26F04D29/403F02C9/18Y02T90/00
Inventor 董旭张燕峰甘久亮卢新根
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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