Non-Recirculating Gas Turbine Lubrication
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Solution Overview
Problem
Conventional bearing lubrication systems for gas turbine engines face challenges in high subsonic or supersonic applications due to the difficulty in integrating heat exchangers that can handle the high temperatures of recirculated oil, which often exceeds the bearing's operating limits.
Innovation Solution
A non-recirculating lubrication system is implemented in the gas turbine engine, comprising a lubricant reservoir, an air system, and a vent, where pressurized air and lubricant are provided to the bearing sump to lubricate and cool the bearings, and then vented to the atmosphere, avoiding recirculation and heat absorption issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a recirculating lubrication system with heat exchanger is used, then bearing lubrication and cooling is achieved, but the system becomes difficult to integrate into supersonic gas turbine engines because air and fuel temperatures exceed bearing operating limits
Solution Approach 1:
The patent extracts the heat exchanger component from the recirculating lubrication system, eliminating the source of high temperature exposure. By removing this component, the system avoids integrating elements that cannot withstand supersonic operating temperatures, thereby resolving the integration complexity issue while maintaining bearing lubrication reliability through direct lubricant delivery without thermal exposure.
Solution Approach 2:
Instead of cooling the lubricant through a heat exchanger that exposes it to high temperatures, the patent inverts the approach by delivering lubricant directly to bearings without thermal processing. The cooling function is achieved indirectly through the lubricant's natural heat absorption capacity and continuous flow, rather than active heat exchange with hot air or fuel.
2Reliability
If pressurized air is used to blow lubricant onto bearings, then lubrication effectiveness is improved, but the system requires additional components for pressurized air generation and control
Solution Approach 1:
The pressurized air system serves multiple functions: it atomizes the lubricant for better distribution, provides cooling airflow to bearings, and enables precise control of lubricant delivery timing and quantity. By consolidating these functions into a single pressurized air supply system, the patent achieves enhanced lubrication effectiveness without proportionally increasing overall system complexity.
Solution Approach 2:
The patent employs pneumatic principles by using pressurized air to atomize and deliver lubricant to bearings. This pneumatic delivery mechanism replaces traditional mechanical pumping and distribution systems, reducing component count while improving lubrication effectiveness through controlled aerosol delivery and simultaneous cooling airflow.
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 solution effectively lubricates and cools the bearings without recirculating the lubricant, managing heat absorption and preventing overheating, thus ensuring the bearings operate within acceptable temperatures even at supersonic speeds.
Implementation Method 1
The air system may further include a heat exchanger filled with a coolant and configured to cool pressurized air before delivery to the bearing sump
Implementation Method 2
The vent may be coupled to the bearing sump and to the atmosphere, and the vent may be sized to conduct the lubricant provided by the lubricant reservoir and pressurized air provided by the air system to the atmosphere
Implementation Method 3
The air system may be coupled to the bearing sump and configured to provide pressurized air to the bearing sump to cool a bearing included in the bearing sump
Implementation Method 4
The non-recirculating lubrication system is configured to provide pressurized air and lubricant to the bearing sump to lubricate and cool bearings included in the bearing sump
Data Source
AI summary
A lubrication system for a gas turbine engine is disclosed. The lubrication system is configured to provide pressurized air and lubricant to a bearing sump of the gas turbine engine to cool and lubricate a bearing included in the bearing sump.