Variable Volume Bearing Compartment for Gas Turbine Oil Leakage
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Solution Overview
Problem
In gas turbine engines, transient operational conditions can lead to insufficient pressure from the air buffer system, causing oil leakage from bearing compartments due to a reversal of pressure difference, which existing systems struggle to inhibit effectively.
Innovation Solution
A bearing compartment assembly that includes a reactive volume vessel with a displaceable member, which increases the volume of the compartment to maintain a sufficient pressure differential between the air buffer system and the bearing compartment, preventing oil leakage by adjusting the compartment's volume in response to changing pressure conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the air buffer system pressurizes the exterior of the bearing compartment, then oil leakage is inhibited under normal conditions, but during transient operational conditions the pressure becomes insufficient and leakage occurs
Solution Approach 1:
The bearing compartment volume is made dynamically adjustable through a variable volume mechanism. During transient conditions such as snap deceleration, the compartment volume increases to maintain the pressure differential and prevent oil leakage, whereas under normal conditions the volume remains at its standard size. This dynamic adaptation resolves the contradiction between maintaining reliable pressure differential and adapting to transient operational conditions.
Solution Approach 2:
The system changes the physical parameter of bearing compartment volume in response to operational conditions. By increasing the compartment volume during transient conditions, the pressure differential is maintained despite external pressure fluctuations, preventing oil leakage. This parameter change allows the system to adapt to varying operational demands while maintaining reliability.
2Reliability
If the bearing compartment volume is increased during transient conditions, then pressure differential is maintained, but the system complexity increases
Solution Approach 1:
The variable volume mechanism is designed to operate automatically in response to pressure differential changes or operational conditions. The bearing compartment volume adjusts itself without requiring complex external control systems, reducing overall system complexity while maintaining oil leakage prevention capability. The mechanism self-regulates based on inherent system parameters.
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 solution effectively maintains a positive pressure differential, reducing oil leakage during transient conditions, such as snap deceleration, by augmenting the compartment volume with the reactive volume vessel, ensuring the air buffer system can maintain pressure integrity.
Implementation Method 1
maintain a sufficient pressure differential between the air buffer system and the bearing compartment
Data Source
AI summary
A bearing compartment assembly includes a bearing compartment with a bearing and a plenum, a buffer system that supplies pressure to an exterior of the bearing compartment, and a reactive volume vessel connected to the bearing compartment. The reactive volume vessel has a displaceable member that is movable between two positions, one of which adds additional volume to the bearing compartment.