Inner Bypass Duct Composite Fireproof Acoustic Layer
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Solution Overview
Problem
Current gas turbine engines lack effective protection for their inner bypass ducts against potential fire hazards and noise, as the existing designs do not adequately incorporate fireproof and acoustic layers to safeguard against these risks.
Innovation Solution
The inner bypass ducts are equipped with non-structural front panels featuring a composite structure comprising a fireproof layer and an acoustic layer, where the acoustic layer is strategically positioned between the fireproof layer and the inner surface, utilizing materials like honeycomb structures and adhesives to provide comprehensive protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fireproof and acoustic layers are added to the inner bypass duct, then protection against fire hazards and noise is improved, but device complexity increases
Solution Approach 1:
The patent applies composite materials by combining a fireproof layer and an acoustic layer into a integrated composite structure that covers the inner surface of the bypass duct. This composite structure simultaneously provides fire protection and noise attenuation without requiring separate independent systems, thereby improving reliability while managing device complexity through material integration rather than structural multiplication.
2Reliability
If composite structure with multiple layers is used, then fireproof and acoustic protection is improved, but manufacturing complexity increases
Solution Approach 1:
The patent employs preliminary action by pre-assembling the fireproof layer and acoustic layer into a integrated composite structure before installation onto the bypass duct. This pre-integration approach allows the complex multi-layer construction to be manufactured and tested separately, then installed as a single unit, thereby improving fireproof and acoustic protection while reducing the complexity of the overall manufacturing process through modular assembly.
3Weight of moving object
If lightweight materials are used for the composite structure, then weight is reduced, but structural strength may be compromised
Solution Approach 1:
The patent utilizes composite materials with inherent strength-to-weight ratio advantages. The fireproof layer and acoustic layer are constructed using lightweight yet structurally sound materials that provide the necessary protection while minimizing added weight. The composite nature of the structure allows for optimization of each layer's material properties to achieve both weight reduction and maintained structural integrity.
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 effectively mitigates fire hazards and noise issues within the inner bypass ducts, ensuring the structural integrity and operational safety of the engine while minimizing weight and cost through the use of lightweight yet resilient materials and efficient bonding methods.
Implementation Method 1
an acoustic layer disposed between the fireproof layer and the inner surface
Implementation Method 2
a fireproof layer and an acoustic layer disposed between the fireproof layer and the inner surface
Data Source
AI summary
An inner bypass duct of a gas turbine engine includes a plurality of non-structural front panels arranged circumferentially. Each front panel has an outer surface and an inner surface. The inner surface is at least partially covered by a composite structure. The composite structure includes a fireproof layer and an acoustic layer disposed between the fireproof layer and the inner surface. A non-structural panel for an inner bypass duct and a method of forming such panel are also presented.