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Rotor bow management

一种转子弯曲、高压转子的技术，应用在航空运输、发动机功能、发动机控制等方向，能够解决能量量不能如此精确地确定等问题，达到减少时间、降低严重性的效果

Inactive Publication Date: 2019-07-16
ROLLS ROYCE PLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, the amount of energy stored in a battery cannot be determined with such precision and often requires close monitoring of voltage / current during charge / discharge cycles
Even if this is implemented, the amount of stored energy can only be estimated

Method used

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Embodiment Construction

[0043] The present disclosure relates to a method of reducing rotor bowing in a gas turbine engine, an aerodynamic system for controlling rotor bowing in a rotor of a gas turbine engine, and a gas turbine engine including the same.

[0044] As mentioned above, when a gas turbine engine is shut down, it experiences a condition known as rotor bending whereby the engine rotor or shaft experiences the effects of thermal gradients created across the upper and lower portions of the engine. The natural convection process during cooling causes the lower part of the engine to cool faster than the upper part. Consequently, the engine rotors experience temperature differences that typically result in slight bending of the rotor or rotors (usually the rotor system) that provide the main axis of rotation of the engine. Rotor bending generally affects high-pressure rotors in particular.

[0045]In some cases, if the rotor or rotor system restarts in a deformed state (eg, due to compressor ...

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PUM

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Abstract

A method of reducing rotor bow in a high pressure rotor of a gas turbine engine that has in axial flow a low pressure rotor and a high pressure rotor. The method involves (a) storing bleed air from the gas turbine engine when the engine is running to provide stored pneumatic energy; and (b) using that stored pneumatic energy after the engine has been shut-down to rotate the high pressure rotor ata speed and for a duration that reduces rotor bow. A gas turbine engine wherein rotor bow in the high pressure rotor after engine shut-down has been reduced by carrying out the aforesaid method is also disclosed.

Description

[0001] Cross References to Related Applications [0002] This specification is based upon and claims the benefit of priority from British Patent Application No. GB ​​1720944.6 filed 15 December 2017, the entire contents of which are incorporated herein by reference. technical field [0003] The present disclosure relates to gas turbine engines and their manufacture. More specifically, the present disclosure relates to a method of managing rotor bowing in a gas turbine engine, such as a civil aviation gas turbine engine. Background technique [0004] Gas turbine engines typically have a low pressure rotor and a high pressure rotor in axial flow. Some engines have an intermediate pressure rotor between the low pressure rotor and the high pressure rotor. The rotors are exposed to high temperatures during operation, causing them to expand. High pressure rotors are typically exposed to the highest of these temperatures. [0005] When a gas turbine engine is shut down, uneven ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D19/02F01D5/14F02C7/268
CPCF01D19/02F01D5/147F02C7/268F01D25/34F01D25/36F02C6/16F02C7/277F02C7/32F05D2270/65Y02E60/16Y02T50/60F01D19/00F01D21/06F02C1/02F02C6/08F02C9/18F05D2260/42F05D2260/606F05D2270/305
Inventor A.史提芬逊
Owner ROLLS ROYCE PLC