Bearing Compartment Cooling Protuberances for Gas Turbine Engines
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Solution Overview
Problem
The reduction in size of gas turbine engines to reduce weight while maintaining power output has made it challenging to provide sufficient cooling for bearing systems, as the volume of bearing compartments has decreased, leading to potential overheating issues.
Innovation Solution
The design of a bearing compartment with a housing that includes cooling protuberances extending into the lubricant volume, increasing the surface area exposed to the lubricant and enhancing cooling efficiency, thereby reducing wall temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the bearing compartment volume is reduced to decrease engine weight, then the engine weight is reduced, but the cooling efficiency deteriorates leading to potential overheating
Solution Approach 1:
The patent applies dimensional change by adding protuberances that extend radially inward from the housing inner surface into the bearing compartment volume. This transforms the原本 two-dimensional cooling surface into a three-dimensional structure with increased surface area, allowing effective cooling in a reduced volume compartment
Solution Approach 2:
The housing inner surface is segmented into multiple protuberances distributed around the bearing compartment. Each protuberance acts as an independent cooling element, collectively providing sufficient cooling surface area while maintaining compact overall dimensions
2Weight of moving object
If the bearing compartment volume is reduced to decrease engine weight, then the engine weight is reduced, but the cooling surface area decreases
Solution Approach 1:
The patent creates additional cooling surface area by adding radial depth through protuberances. This extends the cooling surface from the original housing wall into the bearing compartment volume, effectively increasing surface area without increasing the overall compartment volume
Solution Approach 2:
The protuberances are nested within the bearing compartment volume, extending radially inward from the housing wall. This nested arrangement increases cooling surface area by utilizing the existing volume space more efficiently, with protuberances nested within the annular space between the housing and bearing
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 design effectively manages thermal issues in reduced bearing compartment volumes by maintaining lower wall temperatures, preventing overheating and ensuring efficient operation of the bearing systems.
Implementation Method 1
The cooling protuberances extend into the bearing compartment volume and increase the surface area exposed to the lubricant... effectively manages thermal issues in reduced bearing compartment volumes by maintaining lower wall temperatures
Data Source
Figure 1
Figure 2~3
AI summary
A bearing compartment for a gas turbine engine comprises a housing that surrounds an engine axis of rotation and has an inner surface and an outer surface spaced radially outward of the inner surface. The housing defines an open volume for a lubricant and includes a bearing seat to seat a bearing for rotation about the engine axis of rotation. The housing includes at least one cooling protuberance extending into the open volume.