Fuel Cell Turbine Spool Damping Through Resonance Zones
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Solution Overview
Problem
Gas turbine engines experience undesired resonant responses during specific rotational speed zones, which can lead to vibrations and instability, requiring effective damping mechanisms to prevent damage and ensure smooth operation.
Innovation Solution
Integration of a fuel cell assembly and an electric machine within the turbomachine, where the fuel cell provides electrical power to the electric machine, and a controller modifies the fuel flow and power distribution to dampen resonant responses by adjusting the secondary fuel flow and power extraction based on spool parameter data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a gas turbine engine operates through specific rotational speed zones, then the engine can achieve desired power output, but undesired resonant responses occur causing vibrations and instability
Solution Approach 1:
The patent applies dynamics by making the fuel flow rate variable rather than fixed. The controller dynamically adjusts the fuel flow rate to the combustor based on real-time spool parameter feedback, enabling the engine to adapt its operating characteristics during acceleration and deceleration through resonance zones, thereby maintaining stability while achieving required power output
Solution Approach 2:
The patent implements feedback control by using a sensor to continuously monitor spool parameters and feeding this information back to the controller. The controller then modifies the fuel flow rate in response to this feedback, creating a closed-loop system that actively dampens resonant responses and maintains rotational stability during operation
2Stability of the object's composition
If dedicated damping systems are added to prevent resonant responses, then rotational stability improves, but device complexity increases
Solution Approach 1:
The patent applies universality by making the fuel cell assembly and controller serve multiple functions. These components not only generate electrical power for the gas turbine engine but also simultaneously act as a damping system by modulating fuel flow to counteract resonant responses, thereby eliminating the need for dedicated damping hardware
Solution Approach 2:
The patent merges the power generation function and the vibration damping function into a single integrated system. The fuel cell assembly and control mechanism that originally served only for power generation are combined with the fuel delivery system to also perform active damping, reducing overall system complexity
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 solution effectively reduces or prevents resonant responses by accelerating or decelerating the spool through critical speed zones, enhancing the stability and efficiency of the gas turbine engine without the need for dedicated damping systems.
Implementation Method 1
a fuel cell assembly integrated into the turbomachine
Implementation Method 2
an electric machine drivingly coupled to the spool and electrically coupled to the fuel cell assembly
Data Source
AI summary
A method of operating a gas turbine engine is provided. The method includes: providing a flow of a primary fuel to a combustor of a turbomachine, the turbomachine including a compressor, a turbine, and a spool rotatable with the compressor and the turbine; receiving data indicative of a spool parameter of the spool; and modifying a flow of a secondary fuel to the combustor in response to the received data indicative of the spool parameter of the spool.