Shared-Propellant Fuel Cell and Thruster for Flexible Power Generation
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Solution Overview
Problem
Current systems for generating electricity, whether through fuel cells or combustion systems, are inefficient in converting chemical energy and lack the flexibility to seamlessly switch between electrical power generation and combustion applications.
Innovation Solution
An integrated fuel cell and combustion system that combines a fuel cell with a bipropellant thruster, allowing simultaneous electricity generation and combustion functions, with the ability to bypass components for exclusive use in either mode, sharing a fuel and oxidizer source for optimized energy utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a combustion system is used to generate electrical power by driving a dynamo or running a thermoelectric generator, then electrical power can be generated, but the efficiency is significantly lower than direct chemical energy conversion via fuel cell
Solution Approach 1:
The system integrates a fuel cell stack and a combustion system (bipropellant thruster) into a single multi-functional platform that can operate in multiple modes: electricity generation mode, combustion thrust mode, and hybrid mode. The fuel cell generates electricity efficiently while the combustion system provides high-temperature gases for thrust or torque, allowing the system to adapt to different operational requirements without sacrificing efficiency in either function
Solution Approach 2:
The patent combines the fuel cell stack and combustion system into an integrated architecture where both subsystems share common components such as the fuel/oxidizer storage system and control electronics. This merging allows the system to achieve both high electrical efficiency through the fuel cell and high combustion effectiveness through the thruster, resolving the contradiction between energy efficiency and functional versatility
2Loss of energy
If a fuel cell is used to generate electrical power, then high efficiency is achieved, but the gases produced are not as effective at driving combustion applications since they are not formed as quickly or reach as high a temperature
Solution Approach 1:
The system segments the energy conversion processes into two distinct pathways: the fuel cell pathway for efficient electrical power generation, and the combustion pathway for high-temperature gas production. By separating these functions into dedicated subsystems rather than attempting a single process to do both, the system achieves high efficiency in electricity generation while simultaneously maintaining effectiveness in combustion applications
Solution Approach 2:
The integrated system provides universality by enabling the same fuel and oxidizer resources to serve dual purposes: electrochemical conversion for electricity and combustion conversion for thrust/torque. The system can dynamically allocate resources between these two functions based on operational needs, achieving both electrical efficiency and combustion effectiveness
3Reliability
If separate fuel cell and combustion systems are used, then each function can be optimized, but the refueling process must be conducted separately for each system
Solution Approach 1:
The system merges the fuel and oxidizer storage and delivery systems for both the fuel cell and combustion system into a unified infrastructure. This consolidation allows a single refueling operation to replenish both subsystems simultaneously, reducing refueling complexity and operational time while maintaining the functional performance and optimization of each subsystem
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 integrated system provides high-capacity, efficient power generation and effective thrust or torque, enabling flexible energy use and simplifying refueling by consolidating chemical energy storage for both electrical power and combustion functions.
Implementation Method 1
A fuel cell can generate electrical power by electrochemically oxidizing a fuel while concurrently reducing an oxidizer
Implementation Method 2
A combustion system can tap the chemical energy in a fuel and oxidizer by igniting a mixture of these chemicals to create hot gases
Data Source
AI summary
An integrated fuel cell and combustion system that integrate both a fuel cell and a combustion system, such that the fuel cell and the combustion system share a a fuel source and an oxidizer source, and the fuel cell and combustion system can be utilized singularly or simultaneously based on the needs for power generation.