Diffuser Bleed Baffle Assembly for Acoustic Damping
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Solution Overview
Problem
Current gas turbine engines face inefficiencies due to large bleed ports that increase weight and reduce performance, leading to flow separation and uneven air distribution, which can cause damage and reduce engine efficiency.
Innovation Solution
An integrated diffuser-baffle bleed assembly that directs boundary layer flow from the diffuser to the bleed port through a passage with a gradually increasing width, allowing for a smaller bleed port size and shorter diffuser length, while also acting as a baffle to dampen acoustic instabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the bleed port size is increased to accommodate larger air flows, then the bleed demand is met, but the engine weight increases and performance decreases
Solution Approach 1:
The bleed port is divided into multiple smaller ports distributed around the diffuser outlet, allowing the required air flow quantity to be achieved through cumulative effect of multiple ports rather than a single large port, thereby avoiding excessive weight increase
2Quantity of substance
If the bleed port size is increased to accommodate larger air flows, then the bleed demand is met, but engine performance is reduced
Solution Approach 1:
The bleed ports are strategically positioned and sized to extract boundary layer flow specifically, which has different properties than the main flow, allowing selective removal of low-momentum air that would otherwise cause flow separation and performance loss
3Quantity of substance
If a large bleed port is used, then larger air flows are accommodated, but flow separation occurs
Solution Approach 1:
The bleed ports are positioned to tap specifically into the boundary layer flow region, extracting only the low-momentum air near the wall, while preserving the high-momentum main flow, thereby preventing flow separation and maintaining flow stability
4Stress or pressure
If the diffuser length is increased to improve pressure recovery, then pressure recovery is enhanced, but the engine length increases
Solution Approach 1:
The boundary layer flow is extracted through bleed ports located at the diffuser outlet, removing the low-momentum air that would cause flow separation, thereby enabling shorter diffuser designs to achieve adequate pressure recovery without the need for excessively long diffusers
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
This configuration reduces engine weight and length, improves efficiency by maintaining boundary layer flow proximity to the wall, preventing flow separation, and enhancing pressure recovery, thus increasing engine performance and reducing the risk of damage.
Implementation Method 1
the integrated diffuser-bleed baffle assembly is configured to flow a boundary layer flow from the diffuser to the bleed port
Implementation Method 2
dampening an acoustic instability in a cavity downstream of the diffuser
Data Source
AI summary
An engine may include an integrated diffuser-bleed baffle assembly, a diffuser, and a bleed port. The integrated diffuser-bleed baffle assembly fluidly coupled between the diffuser and the bleed port. The integrated diffuser-bleed baffle assembly is configured to flow a boundary layer flow from the diffuser to the bleed port. A baffle hole may be included in the integrated diffuser-bleed baffle assembly such that the assembly may function to dampen acoustic instabilities in the engine.