Aft-Mounted Electric Machine Cooling in Reverse-Flow Turbine Engines
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Solution Overview
Problem
Existing gas turbine engines with reverse flow configurations face challenges in integrating auxiliary components like electric machines efficiently, particularly due to space constraints and heat management issues.
Innovation Solution
The electric machine is positioned aft of the core turbine engine, rotatingly coupled to the low-pressure shaft, and integrated with the intake channel to facilitate heat exchange, allowing for tighter packaging and effective cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the electric machine is integrated into the reverse flow gas turbine engine, then the power density and operational efficiency are improved, but the space constraints and heat management issues worsen
Solution Approach 1:
The electric machine is merged with the reverse flow gas turbine engine by positioning it within the engine structure and integrating it with the intake channel. The electric machine is rotatably mounted within the engine casing and coupled to the low-pressure shaft, combining two functional systems into a unified configuration that shares structural and thermal resources.
Solution Approach 2:
The intake channel serves as an intermediary element that facilitates heat exchange between the incoming air flow and the electric machine. The intake channel is positioned to allow thermal interaction with the electric machine, enabling the incoming air to cool the electric machine while maintaining its rotational function.
2Temperature
If the electric machine is positioned aft of the core turbine engine and integrated with the intake channel, then heat exchange and cooling effectiveness are improved, but the packaging constraints worsen
Solution Approach 1:
The electric machine is positioned in the aft section of the engine along the axial dimension, utilizing the length of the engine rather than occupying additional radial or circumferential space. The intake channel is configured to extend into this aft region, creating a thermal exchange pathway that utilizes the existing engine volume efficiently.
Solution Approach 2:
The electric machine is nested within the engine casing structure, with the intake channel nested to provide both airflow passage and thermal exchange surface. The configuration allows the electric machine to be housed within the existing engine envelope while the intake channel is routed to provide cooling without requiring additional external volume.
3Adaptability or versatility
If the electric machine is rotatably mounted within the engine and coupled to the low-pressure shaft, then the operational flexibility and power supplementation are improved, but the mechanical complexity worsens
Solution Approach 1:
The low-pressure shaft serves multiple functions by being coupled to both the propeller section and the electric machine. This universal shaft configuration allows the electric machine to be driven during normal operation for power generation or motor operation for power supplementation, eliminating the need for separate drive mechanisms.
Solution Approach 2:
The electric machine is self-contained within the engine structure, with its own rotational mounting and coupling mechanisms integrated into the existing shaft system. The intake channel provides self-service cooling by utilizing the incoming air flow that would otherwise pass through the engine, eliminating the need for separate cooling systems.
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 configuration enhances the electric machine's operational efficiency by managing heat effectively, enabling higher power density and flexible power supplementation to the propeller section.
Implementation Method 1
the electric machine in heat exchange communication with the intake flow of air such that the electric machine transfers heat to the incoming flow of air within the intake channel when the electric machine is operated
Data Source
AI summary
An aircraft engine assembly includes a gas turbine engine having an intake channel configured to receive an incoming flow of air and form an intake flow of air, the intake channel configured to turn the received incoming flow of air from an incoming flow direction to a first axial direction of the gas turbine engine, the incoming flow direction reverse of the first axial direction, and an electric machine coupled with the low pressure shaft and located at the aft end of the gas turbine engine proximate the intake channel, the electric machine in heat exchange communication with the intake flow of air such that the electric machine transfers heat to the incoming flow of air within the intake channel when the electric machine is operated.