Variable Bleed Valve Inner Wall Flow Circuit for Turbine Acoustic Damping

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Solution Overview

Problem

Turbine engines experience acoustic resonance issues due to turbulent airflow over variable bleed valve cavities, leading to mechanical instability and potential component failure during low-speed operations.

Innovation Solution

Channels are formed in the casing upstream of the variable bleed valve port to direct airflow and reduce shear layer instability, thereby dampening acoustic resonance and mitigating its impact on surrounding components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If variable bleed valve is used during low-speed operations, then engine control flexibility is improved, but acoustic resonance and mechanical instability occur

Engineering Contradiction:

Improveengine control flexibilityVSAvoidmechanical stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

A channel structure is introduced as an intermediary element between the upstream flow path and the variable bleed valve cavity. This channel mediates the airflow by directing it to impinge on the shear layer, thereby reducing acoustic resonance and mechanical instability while preserving the valve's control flexibility function

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If airflow is directed over variable bleed valve cavity, then valve function is achieved, but shear layer instability and acoustic resonance are generated

Engineering Contradiction:

Improvevalve functionVSAvoidacoustic resonance

Core Design Contradiction:

Ease of operationVSObject-generated harmful factors

Solution Approach 1:

The harmful shear layer instability and acoustic resonance generated by airflow over the variable bleed valve cavity are converted into a beneficial effect. By introducing a channel that directs airflow to specifically impinge on the shear layer, the instability is reduced and acoustic resonance is dampened, transforming the harmful flow characteristics into a stabilizing mechanism

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution effectively reduces acoustic resonance and associated mechanical stress, improving the operational stability and extending the lifespan of turbine engine components.

Implementation Method 1

the channel including a first opening into the first flow path, and a second opening into the second flow path, the channel defining a third flow path between the first opening and the second opening

Methodology Applied

Scientific EffectFluid flow:

Implementation Method 2

Channels are formed in the casing upstream of the variable bleed valve port to direct airflow and reduce shear layer instability, thereby dampening acoustic resonance

Methodology Applied

Scientific EffectAcoustic resonance damping: Damping

Data Source

PatentUS11753965B1Variable bleed valves with inner wall controlled-flow circuits

Publication Date: 2023.09.12 GENERAL ELECTRIC CO

AI summary

Variable bleed valves with inner wall controlled-flow circuits are disclosed. An example apparatus disclosed herein includes a casing segment defining a first flow path, a variable bleed valve port defining a second flow path, and a channel formed in the casing segment, the channel including a first opening into the first flow path, and a second opening into the second flow path, the channel defining a third flow path between the first opening and the second opening.