Fuel Isomerization for Aircraft Thermal Management
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Solution Overview
Problem
High-performance aircraft face thermal management challenges due to the need for cooling various systems and maintaining fuel tank temperature within design bounds, especially at high altitudes or ground operations, where existing methods like transferring waste heat to fuel become inefficient when the fuel tank temperature exceeds limits.
Innovation Solution
A system utilizing a heat source, an endothermic process module with a catalyst, and a fuel source to isomerize fuel, increasing its thermal carrying capacity without raising the fuel temperature, thereby enhancing the fuel's ability to absorb heat and manage thermal loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If waste heat is transferred to fuel in the fuel tank, then thermal management is improved, but fuel temperature exceeds design bounds
Solution Approach 1:
The patent applies parameter changes by isomerizing the fuel molecules, transforming them from a linear configuration to a branched configuration. This chemical structural change increases the fuel's thermal carrying capacity by approximately 30%, allowing the fuel to absorb more heat without exceeding temperature design bounds. The isomerization process fundamentally alters the fuel's thermal properties rather than simply adjusting operational parameters.
Solution Approach 2:
The patent utilizes an endothermic phase transition process where the fuel undergoes isomerization that absorbs thermal energy. The endothermic reaction absorbs heat from the fuel tank, effectively cooling the fuel while simultaneously increasing its thermal carrying capacity. This phase transition approach allows the system to manage thermal loads without raising fuel temperature.
2Temperature
If fuel burning rate is increased to cool fuel tank, then thermal limits are maintained, but operational flexibility is reduced
Solution Approach 1:
The patent implements self-service by enabling the fuel to cool itself through endothermic isomerization. The fuel tank system automatically absorbs excess heat through the isomerization process, eliminating the need for operational modifications such as increased fuel burning rates. The system self-regulates thermal management without requiring changes to flight operations or fuel consumption patterns.
3Temperature
If thermal carrying capacity of fuel is increased through isomerization, then thermal management is improved, but device complexity increases
Solution Approach 1:
The patent introduces an endothermic process module as an intermediary component that facilitates the isomerization process. This module contains the catalyst and provides the controlled environment needed for thermal carrying capacity enhancement. By concentrating the complexity in a dedicated, manageable module rather than distributing it throughout the entire fuel system, the overall device complexity is minimized while achieving the desired thermal management improvements.
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
The system effectively increases the thermal carrying capacity of fuel by up to 30%, allowing for improved thermal management and operational flexibility by absorbing waste heat without elevating fuel temperature, thus alleviating the need for frequent modifications in aircraft operations.
Implementation Method 1
The endothermic process module includes a catalyst that isomerizes fuel from the fuel source to increase the thermal carrying capacity of the fuel without raising the temperature of the fuel
Implementation Method 2
The endothermic process module includes a catalyst that isomerizes fuel from the fuel source
Data Source
AI summary
Embodiments of a system are disclosed that include a heat source, an endothermic process module, and a fuel source configured to supply fuel to the endothermic process module and to receive isomerized fuel from the endothermic process module. A controller includes logic instructions operable to receive information regarding temperature of fuel received by the endothermic process module, and regulate application of heat from the heat source to the fuel at the endothermic process module. The endothermic process module includes a catalyst that increases the thermal carrying capacity of the fuel by isomerizing fuel from the fuel source.