Multi-Spool Engine Load Balancing Under Thermal Limits
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing technologies fail to effectively address the need for dynamic electrical load balancing between different spools of a gas turbine engine to optimize fuel burn and improve thermal management system (TMS) performance, especially during ground performance with limited airflow.
Innovation Solution
Implement a system with electrical machines and controllers on both high-pressure and low-pressure spools, utilizing a supervisory controller to dynamically balance electrical loads based on ambient and system thermal conditions, adjusting load levels and current distribution to optimize fuel consumption and reduce thermal impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electrical machines operate at full performance level during ground performance, then electrical system performance is improved, but thermal management system capability is exceeded due to limited airflow
Solution Approach 1:
The patent implements dynamic load balancing between high-pressure and low-pressure spool electrical machines based on real-time thermal conditions. The system continuously adjusts the operational load distribution between the two spools to match the available thermal management capacity, which varies with airflow conditions. This dynamic adaptation allows the electrical system to operate at or near full performance while preventing thermal management system overload.
2Device complexity
If electrical load is concentrated on a single spool, then electrical system simplicity is improved, but fuel burn optimization is reduced due to limited operational flexibility
Solution Approach 1:
The patent divides the electrical load between two separate spools (high-pressure and low-pressure), each equipped with its own electrical machine. This segmentation allows independent control and optimization of each spool's contribution to the total electrical output. By distributing the load rather than concentrating it on a single spool, the system gains flexibility to optimize fuel burn by selecting the most efficient spool configuration for given operating conditions.
3Productivity
If thermal management system capacity is increased to support full electrical performance, then electrical system performance is improved, but device complexity and system weight increase
Solution Approach 1:
The patent employs a self-regulating thermal management approach where the electrical load distribution automatically adjusts based on the existing thermal management system capacity and real-time thermal conditions. Rather than oversizing the thermal management system to handle maximum possible electrical loads, the system intelligently balances the electrical load between spools to match the actual thermal handling capability. This self-service approach allows full utilization of the existing thermal management infrastructure without requiring additional cooling capacity or system complexity.
Data Source
AI summary
A first electrical machine is configured to act as an electrical motor in a first mode and an electrical generator in a second mode. Each first electrical machine is associated with a high-pressure spool of a turbine engine. A first controller is configured to control a load level of the first electrical machine responsive to a first load level control signal. A second electrical machine is configured to act as an electrical motor in the first mode and as an electrical generator in the second mode. The second electrical machine is associated with a low-pressure spool of the turbine engine. A second controller is configured to control a load level of the second electrical machine responsive to a second load level control signal. A third controller is configured to generate the first load level control signal and the second load level control signal responsive to temperatures of the first electrical machine, the first controller, the second electrical machine, and the second controller.


