Outlet Guide Vane Cooling Structure for Debris-Resistant Gearbox Heat Transfer
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Solution Overview
Problem
Conventional cooling arrangements for gearboxes in geared turbofan engines, such as epicyclic gearboxes, result in increased weight and complexity due to the need for robust cooling channels that are susceptible to damage from debris and ice entrained in high-speed airflow, compromising heat transfer efficiency.
Innovation Solution
An outlet guide vane structure with internal cavities and conduits for coolant flow, designed to minimize the risk of damage from debris while maximizing heat transfer, using airflow to cool the gearbox efficiently and compactly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cooling channels are located within the bypass channel to cool the gearbox, then the cooling capability is sufficient, but the channels are exposed to collision from debris and ice, requiring stronger and more substantial channels that compromise heat transfer properties
Solution Approach 1:
The cooling function is extracted from the bypass channel environment and relocated to the gearbox housing itself. The housing acts as the heat exchanger, containing internal cooling passages that are shielded from debris while maintaining thermal contact with the gearbox components, thus protecting the cooling system from impact damage while preserving heat transfer efficiency
Solution Approach 2:
The gearbox housing is given multiple functions: it serves as both the structural enclosure for the gearbox and as the heat exchanger for cooling. This eliminates the need for separate vulnerable cooling channels in the bypass channel, as the housing itself performs the thermal management function with inherent protection from debris
2Reliability
If stronger and more substantial cooling channels are used to resist impact damage, then the reliability against debris collision is improved, but the weight and complexity of the cooling system increase
Solution Approach 1:
The gearbox housing performs dual functions as both structural enclosure and heat exchanger, eliminating the need for separate substantial cooling channels. This multi-functionality reduces the overall weight and complexity while maintaining protection against debris, as the housing already exists as a structural component
3Reliability
If stronger and more substantial cooling channels are used to resist impact damage, then the reliability against debris collision is improved, but the device complexity increases
Solution Approach 1:
The gearbox housing serves as both the structural enclosure and the heat exchanger with integrated cooling passages. This eliminates the need for separate complex cooling system components located in the bypass channel, simplifying the overall system while maintaining protection from debris through the inherent shielding of the housing structure
Solution Approach 2:
The cooling system is merged with the gearbox housing structure itself. The housing contains internal passages that serve as cooling channels, combining the structural and thermal management functions into a single integrated component, thereby reducing system complexity and eliminating vulnerable external channels
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 provides a lightweight, efficient, and compact cooling system that reduces the risk of damage and enhances heat transfer, minimizing weight and complexity while maintaining optimal operational performance.
Implementation Method 1
Air passing through a guide vane structure may advantageously be allowed to pass through the cavity of one or more vanes and cause heat transfer from conduits contained within the respective vane
Data Source
AI summary
An outlet guide vane (OGV) structure for a gas turbine engine can comprise a plurality of radially extending guide vanes having inlets and outlets to allow cooling of a medium within the guide vanes.