Nose Cone Generator Thermal Management
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Solution Overview
Problem
Gas turbine engines used in aircraft require complex and expensive cooling systems to manage the high temperatures of exhaust gases near the generator, which complicates the thermal management and mounting of power generators.
Innovation Solution
A generator is positioned within the hollow interior of a nose cone with a heat exchanger in direct contact or wrapping around it, utilizing a cooling fluid to absorb heat from both the generator and lubricant, and a coupling system that allows for different rotational speeds between the shaft and generator shaft, enabling efficient thermal management and simplified mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the generator is positioned within the tail cone near the exhaust gases, then it can utilize the engine's space efficiently, but complex and expensive cooling systems are required to thermally isolate the generator from the hot exhaust gases
Solution Approach 1:
The generator is extracted from the traditional tail cone location and repositioned to the nose cone at the front of the engine, removing it from the high-temperature exhaust gas environment. This eliminates the need for complex thermal isolation and cooling systems while efficiently utilizing the engine's front space.
Solution Approach 2:
A heat exchanger is introduced as an intermediary component between the generator and the cooling fluid flow path. The heat exchanger manages thermal loads from the generator using cooler air from the bypass duct, providing efficient thermal isolation without requiring complex direct cooling systems.
2Temperature
If a complex cooling system is implemented to thermally isolate the generator, then the generator can be positioned near the exhaust gases, but the system becomes more expensive and complex
Solution Approach 1:
The generator is extracted from the high-temperature exhaust gas environment and repositioned to the nose cone, eliminating the need for complex thermal isolation systems. The generator operates in the cooler front section of the engine where thermal management is simplified.
Solution Approach 2:
The cooling system utilizes the engine's own bypass air flow as a free cooling source. The heat exchanger captures thermal energy from this naturally flowing cool air to cool the generator, eliminating the need for separate, energy-consuming cooling systems.
3Ease of manufacture
If the generator is directly coupled to the shaft, then the mounting is simplified, but the generator must operate at the same rotational speed as the shaft which limits design flexibility
Solution Approach 1:
The coupling system is made dynamic and adjustable, allowing the generator shaft to rotate at different speeds than the main engine shaft. This enables the generator to operate at optimal speeds for different power demands while maintaining a relatively simple mounting structure through the use of adjustable couplings and transmissions.
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 reduces the complexity of thermal management and mounting requirements, eliminating the need for expensive cooling systems and allowing for emergency power generation during engine failure by utilizing the fan as a power source.
Implementation Method 1
A heat exchanger is mounted adjacent to the generator within the hollow interior of the nose cone. The heat exchanger is fluidly coupled to the generator.
Implementation Method 2
utilizing a cooling fluid to absorb heat from both the generator and lubricant
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
An engine includes an engine casing (102) and a shaft (40) defining an axis of rotation. The shaft extends through the engine casing. A nose cone (70) is rotatably coupled to the shaft and has a hollow interior. A generator (100) is arranged at least partially within the hollow interior of the nose cone. The generator includes a rotor (106) and a stator (104). The rotor is rotatably coupled to the shaft. A heat exchanger (120) is mounted adjacent to the generator within the hollow interior of the nose cone. The heat exchanger is fluidly coupled to the generator.