Gas Turbine Composite Casing Grooves for Flammable Gas Discharge
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Gas turbine casings made of organic matrix composite material face challenges in extinguishing external fires due to flammable gases released during resin degradation, which can sustain flames even after the engine is shut down.
Innovation Solution
Incorporating grooves on the structural parts of the casing that face the inside face, allowing gases from resin degradation to be discharged into the flow passage, thereby preventing them from reaching the external flame zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the casing is made of organic matrix composite material, then the weight is reduced and mechanical strength is maintained, but flammable gases are released during resin degradation that can sustain external flames
Solution Approach 1:
The structural part is segmented with grooves that divide the surface into regions, creating dedicated pathways for gas discharge. These grooves segment the continuous surface into functional zones: some areas maintain structural integrity while others facilitate gas escape away from the flame zone.
Solution Approach 2:
The harmful flammable gases are extracted from the degradation zone and directed into the flow passage through the grooves. This extraction removes the harmful substance from the flame-affected area, preventing the gases from sustaining external flames while still allowing the composite material to maintain its structural function.
2Strength
If structural parts are fastened against the inside face of the casing by adhesive, then the parts are securely attached, but the adhesive prevents discharge of flammable gases from resin degradation
Solution Approach 1:
The bonding interface is segmented by incorporating grooves that extend through the structural part. This segmentation creates distinct functional zones: the adhesive bonds the structural part to the casing while the grooves provide separate pathways for gas discharge, preventing the adhesive from blocking gas escape routes.
Solution Approach 2:
The grooves act as intermediary channels between the resin degradation zone and the flow passage. They mediate the discharge of flammable gases by providing a dedicated pathway that bypasses the adhesive bonding areas, allowing gases to be directed into the flow passage without compromising the adhesive bonding strength.
3Object-generated harmful factors
If grooves are added to the structural part, then flammable gases can be discharged into the flow passage, but the device complexity increases
Solution Approach 1:
The grooves are applied locally to specific areas of the structural part where gas discharge is needed, rather than modifying the entire component. This localized approach maintains the overall simplicity of the structural part while providing targeted gas discharge capability in the critical zones where resin degradation occurs.
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
Effectively directs flammable gases away from the external fire zone, ensuring reliable fire extinction by facilitating their discharge into the internal passage, thus preventing flame sustenance after the engine is shut down.
Implementation Method 1
gas resulting from degradation of the matrix of the casing in the presence of flames on the outside of the casing can be discharged into the passage
Data Source
AI summary
A gas turbine casing made of organic matrix composite material includes reinforcement densified by an organic matrix defines an inside volume. On its inside face the casing has a structural part with a first face facing the inside face of the casing, and an opposite second face defining a flow passage portion. Recesses opening out into the inside volume of the casing are present between the inside face of the casing and the first face of the structural part facing the inside face of the casing. In the event of a fire, the recesses allow gas coming from degradation of the resin of the casing to be discharged into the flow passage.