Friction Disk Cooling and Inert Gas Shielding Against Oxidation
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Solution Overview
Problem
Aircraft friction disks undergo oxidation due to high temperatures during braking, reducing their usable life, as existing materials like carbon-carbon composites are susceptible to oxidation despite being able to withstand heat.
Innovation Solution
A system that includes a coolant loop to circulate liquid coolant and deliver inert fluid, such as a nitrogen-enriched air stream, to reduce heat and oxygen concentration around the friction disks, thereby mitigating oxidation. The system incorporates a conduit to direct the inert fluid to the friction disks and a heat shield to limit ambient airflow, ensuring effective heat transfer and oxygen reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If carbon-carbon composite material is used for friction disks to withstand high temperatures, then heat resistance is improved, but oxidation resistance deteriorates
Solution Approach 1:
The patent introduces an inert fluid (such as nitrogen or carbon dioxide) into the braking assembly to create an inert atmosphere around the friction disks. This inert environment prevents oxygen from contacting the carbon-carbon composite material, thereby eliminating oxidation while allowing the material to maintain its heat resistance properties.
2Temperature
If carbon-carbon composite material is used for friction disks, then heat withstand capability is improved, but usable life deteriorates due to oxidation
Solution Approach 1:
By maintaining an inert atmosphere within the braking assembly during braking operations, the patent prevents oxidation of the carbon-carbon composite friction disks. This protection allows the friction disks to maintain their structural integrity and heat withstand capability throughout their service life, thereby extending their usable life.
Solution Approach 2:
The inert fluid acts as an intermediary substance between the oxygen in the environment and the carbon-carbon composite friction disks. By introducing this intermediate medium, the patent prevents direct contact between oxygen and the friction disk material, thereby preventing oxidation and extending the usable life of the friction disks.
3Device complexity
If conventional braking assembly design is used, then structural simplicity is maintained, but oxidation of friction disks occurs due to ambient airflow
Solution Approach 1:
The patent modifies the braking assembly to include an inert fluid delivery system that introduces inert gas into the braking assembly. This creates a protected inert environment around the friction disks, preventing oxidation caused by ambient airflow while maintaining relatively simple structural modifications to the conventional design.
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 system significantly reduces the oxidation rate of friction disks by lowering temperature and oxygen concentration, thereby extending their usable life and maintaining braking performance.
Implementation Method 1
a coolant loop coupled in heat exchange communication with the braking assembly. The coolant loop may be configured to circulate liquid coolant such that heat is transferred from the friction disk.
Implementation Method 2
delivery of the inert fluid to the braking assembly via the conduit supplants oxygen in a vicinity of the friction disk to reduce oxidation of the friction disk.
Implementation Method 3
the wheel assembly is configured to limit convective ambient airflow around the friction disk of the braking assembly
Data Source
AI summary
A system, and associated method, for reducing oxidation of a friction disk may include a braking assembly comprising the friction disk and a coolant loop coupled to the braking assembly, with the coolant loop being configured to circulate liquid coolant from the braking assembly. That is, the coolant loop may be configured to reduce the temperature of the braking assembly, thus reducing the rate/extent of oxidation of the friction disks and potentially enabling the concentration of oxygen around the braking assembly to be reduced.