Gas Turbine Outlet Guide Vanes Heat Rejection
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Solution Overview
Problem
Existing gas turbine engines face challenges in managing heat efficiently without introducing new inefficiencies, particularly in the bypass passage where airflow is substantial but temperature is low, making it undesirable to introduce heat exchangers that would cause a significant pressure drop.
Innovation Solution
Integrating heat exchangers into the outlet guide vanes of gas turbine engines, which allows for efficient heat transfer without significantly increasing pressure drop in the bypass passage, by optimizing the heat transfer surface area and airflow through the vanes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heat exchangers are introduced in the bypass passage to manage heat, then heat transfer capability is improved, but pressure drop increases significantly
Solution Approach 1:
The patent merges the heat exchanger function with the existing outlet guide vanes by integrating thermal fluid passageways into the vane structure. This allows the outlet guide vanes to serve dual purposes: guiding airflow and providing heat transfer surfaces, thereby achieving heat management without requiring separate heat exchanger components that would cause additional pressure drop.
Solution Approach 2:
The outlet guide vanes are designed to perform multiple functions simultaneously: aerodynamic flow guidance and thermal management. The thermal fluid passageways are integrated within the vane structure, enabling the same component to handle both airflow control and heat transfer, thus avoiding the need for additional dedicated heat exchangers.
2Temperature
If heat exchangers are added to manage thermal loads, then heat rejection is improved, but device complexity increases
Solution Approach 1:
The thermal management system is merged with the existing outlet guide vane assembly, eliminating the need for separate heat exchanger components. The thermal fluid passageways are integrated directly into the vane structure, reducing the number of discrete parts and simplifying the overall system architecture while maintaining effective heat rejection capability.
3Temperature
If heat transfer surface area is increased in outlet guide vanes, then heat transfer efficiency is improved, but aerodynamic performance may deteriorate
Solution Approach 1:
The patent applies local quality by creating thermal fluid passageways with optimized geometry within specific regions of the outlet guide vanes. The passageway cross-sectional area and positioning are carefully designed to provide sufficient heat transfer surface area while minimizing disruption to the external airflow pattern, thus balancing thermal and aerodynamic performance requirements.
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 approach enables effective heat rejection while maintaining aerodynamic efficiency, potentially leading to a net gain in propulsive efficiency and overcoming previous concerns about increased power usage and complexity.
Implementation Method 1
heat exchanger integrated with a plurality of outlet guide vanes... heat transfer fluid... heat rejection
Data Source
AI summary
A gas turbine engine is provided having a plurality of outlet guide vanes, each defining an internal thermal fluid passageway. The engine defining an Outlet Guide Vane Cooling Capacity greater than 0.01 and less than 13, wherein OGVCC equals:[HTSAOGV×BPR(BPR+1)×Cair×(Tinlet-Tair)×vflight×DfanFnTotal×vtip speed×ΔH]1/3,andwhereinHTSAOGV=Nvane×Dfan2×(1-ROGV_ratio2)2×sin(180/Nvane)×sinθOGV×fOGV.