Aircraft Compressed Gas Cooling for Lubrication Failure
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Solution Overview
Problem
Existing cooling systems for industrial components like gearboxes and transmissions, especially in aircraft, fail to adequately manage heat when the primary lubrication system fails, leading to excessive wear and potential component failure, and often add significant weight or volume with backup systems.
Innovation Solution
A continuous compressed gas cooling system that supplies compressed gas, such as helium or argon, to the component, using a compressor and controller to manage the gas flow and pressure, with detection sensors to activate the system upon lubrication failure, enhancing convective heat transfer and extending operational time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a backup cooling system is added to manage heat when lubrication fails, then component protection is improved, but system weight and volume increase significantly
Solution Approach 1:
The patent introduces compressed gas as an intermediary cooling medium that can be rapidly deployed when lubrication fails. The gas acts as a temporary substitute for the primary lubrication cooling system, providing heat removal capability without requiring a permanent backup cooling system. This resolves the contradiction by providing component protection only when needed, avoiding the continuous weight penalty of a dedicated backup system.
Solution Approach 2:
The system changes the cooling mechanism parameter from liquid-based (lubrication) to gas-based (compressed gas) when lubrication fails. This parameter change allows for a lightweight, on-demand cooling solution that doesn't require the infrastructure of a permanent backup system. The compressed gas can be stored in compact form and deployed rapidly, providing protection without the continuous weight and volume burden.
2Reliability
If a backup cooling system is added to manage heat when lubrication fails, then component protection is improved, but system volume increases significantly
Solution Approach 1:
The compressed gas serves as a compact intermediary cooling medium that can be stored in high-density form and deployed when needed. Unlike liquid-based backup systems that require tanks and piping, the gas system occupies minimal volume until activated, providing component protection without significant volume increase.
Solution Approach 2:
The system uses compressed gas as a temporary, consumable cooling resource that is deployed only when lubrication fails. The gas is compressed into a compact storage form and expended during emergency cooling, providing protection without requiring a permanent, bulky backup system infrastructure.
3Temperature
If compressed gas is continuously supplied to the component, then heat dissipation is improved, but gas consumption increases
Solution Approach 1:
The system uses periodic or on-demand compressed gas supply rather than continuous supply. The gas is activated only when lubrication failure is detected and cooling is needed, and deactivated when cooling is sufficient or lubrication is restored. This periodic action provides effective heat dissipation while minimizing gas consumption by avoiding unnecessary continuous supply.
Solution Approach 2:
The system incorporates feedback control where the compressed gas supply is modulated based on actual cooling needs. Sensors monitor temperature and lubrication status, and the gas supply is adjusted accordingly - increasing when cooling demand is high and decreasing or stopping when cooling demand is low. This feedback mechanism optimizes the balance between heat dissipation effectiveness and gas consumption.
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 effectively cools components during normal operation and as a backup in case of lubrication system failure, extending minimum flight time with reduced weight and volume compared to traditional backup systems, ensuring efficient heat dissipation and component protection.
Implementation Method 1
The compressed gas can have a heat transfer coefficient to transfer heat from the component to atmosphere
Data Source
AI summary
One aspect of a cooling system includes a gas source connected to a component to be cooled. The gas source continuously supplies compressed gas to the component in response to an input. The cooling system also includes a controller connected to the gas source, the controller to provide the input to the gas source to continuously supply the compressed gas to the component.