Aircraft Generator Adaptive Cooling via Selectable Rotor Channels
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Solution Overview
Problem
Contemporary aircraft generator systems face increased cooling requirements due to high temperature environments, leading to increased costs, complexity, weight, and size, with existing wet and dry cavity systems having trade-offs in power density, efficiency, and maintenance needs.
Innovation Solution
A generator system that can be selectively configured to operate as either a wet cavity or dry cavity system by coupling nozzles with coolant apertures to direct liquid coolant for heat extraction, allowing conversion between configurations to optimize cooling based on operational needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a wet cavity cooling system is used to extract heat from stator windings, then cooling effectiveness and power density are improved, but system complexity, weight, and cost increase
Solution Approach 1:
The system dynamically switches between wet cavity and dry cavity cooling modes based on operational requirements. The rotor can be configured to direct coolant either to the stator winding end turns (wet cavity mode) or through rotor pole channels (dry cavity mode), allowing adaptive cooling strategy adjustment without permanent structural modifications.
Solution Approach 2:
The cooling system is designed with universal components that can serve multiple functions. The same rotor channel structure and coolant delivery system support both wet cavity and dry cavity cooling modes, eliminating the need for separate dedicated systems for each cooling type and reducing overall system complexity.
2Temperature
If cooling systems are added to meet increased cooling requirements, then temperature control is improved, but weight and size requirements increase
Solution Approach 1:
The cooling system merges the stator winding cooling function and rotor pole cooling function into a single integrated system. The same coolant flow path and delivery mechanism serve both cooling needs by directing coolant to different destinations based on operational requirements, thereby reducing the total weight compared to having separate dedicated cooling systems.
3Adaptability or versatility
If a generator is designed to operate in both wet cavity and dry cavity modes, then adaptability to different environments is improved, but manufacturing complexity increases
Solution Approach 1:
The generator incorporates dynamic configurability through selectable rotor channel arrangements that can be set during assembly or operation. The rotor design allows channels to be positioned or activated to direct coolant to stator windings or rotor poles as needed, enabling the same physical generator to adapt to different thermal management requirements without requiring multiple specialized designs.
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
Enables flexible operation to match environmental demands, reducing development costs and maintenance by using common parts for both configurations, and minimizing weight and complexity while maintaining efficient power generation.
Implementation Method 1
liquid coolant traversing the rotor channel flows through the rotor pole coolant channels to extract heat from the set of rotor poles
Implementation Method 2
extract heat from the set of rotor poles
Implementation Method 3
liquid coolant traversing the rotor channel is ejected from the set of nozzles to the stator winding end turns to extract heat from the stator windings
Implementation Method 4
extract heat from the stator windings
Data Source
AI summary
A generator includes a stator core having a set of stator poles formed by a post and a wire wound about the post to form a stator winding, with the stator winding having end turns, a rotor having a set of rotor poles and configured to rotate relative to the stator and a rotor channel for liquid coolant to flow through the rotor to a set of coolant apertures, and a set of rotor pole coolant channels aligned with and proximate to the set of rotor poles. The liquid coolant flow extracts heat from the generator.