Hybrid-Electric Compressor Torque Control for Stall Margin Reduction
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Solution Overview
Problem
Conventional aeronautical gas turbine engines are designed with conservative compressor stall margins, limiting their operation and efficiency due to the risk of compressor stall under harsh conditions and engine degradation.
Innovation Solution
A hybrid-electric propulsion system with an electric machine coupled to the compressor, utilizing sensors to detect impending stall conditions and adjusting torque to prevent compressor stall by adding or reducing power, allowing the engine to operate closer to stall limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conservative compressor stall margins are used in conventional gas turbine engines, then reliability is improved by preventing compressor stall, but productivity deteriorates due to limited operation and reduced efficiency
Solution Approach 1:
The system continuously monitors compressor operating conditions and provides feedback to the control system. When the compressor approaches stall conditions, the control system automatically adjusts engine parameters to maintain stable operation, enabling the engine to operate closer to stall limits without actual stalling.
Solution Approach 2:
The system dynamically adjusts engine operating parameters in real-time based on monitored conditions. By continuously adapting to changing operating states, the engine can safely operate at higher efficiency points near stall limits rather than maintaining fixed conservative margins.
2Productivity
If the engine operates closer to stall limits, then productivity is improved through higher efficiency and performance, but reliability deteriorates due to increased risk of compressor stall
Solution Approach 1:
The control system takes preliminary action by detecting early signs of approaching stall conditions and adjusting engine parameters before actual stall occurs. This proactive approach allows the engine to operate closer to stall limits while maintaining reliability through preventive control.
Solution Approach 2:
Continuous monitoring and feedback control enable the system to maintain reliable operation near stall limits by automatically correcting deviations before they lead to compressor stall, thus achieving both high efficiency and reliability.
3Productivity
If hybrid-electric propulsion system with torque modification is used, then productivity is improved by enabling quicker accelerations and higher performance, but device complexity increases due to additional electric machine and control systems
Solution Approach 1:
The electric machine serves multiple functions: it provides torque modification for acceleration enhancement, supports compressor stall mitigation, and contributes to overall propulsion. This multi-functionality justifies the added complexity by delivering multiple performance benefits from a single component.
Solution Approach 2:
The system merges the electric machine with the existing gas turbine propulsion system, combining electric and thermal propulsion capabilities. This integration allows the hybrid system to achieve superior acceleration performance while sharing common infrastructure and control architectures.
Data Source
AI summary
A method for operating a hybrid-electric propulsion system of an aircraft, the hybrid-electric propulsion system comprising a gas turbine engine having a compressor and an electric machine coupled to the compressor, the method comprising: sensing data indicative of a pressure within the compressor of the gas turbine engine; determining conditions within the compressor are within a threshold of a stall limit for the compressor based at least in part on the sensed data indicative of the pressure within the compressor of the gas turbine engine; and modifying a torque of the compressor using the electric machine in response to determining the conditions within the compressor are within the threshold of the stall limit for the compressor to reduce a risk of compressor stall.