Passive Fuel Additive Dosing via Membrane Contactor
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Solution Overview
Problem
Aircraft fuel systems face issues with the formation of carbonaceous deposits due to autoxidation reactions at elevated temperatures, which reduce heat rejection capability and lead to maintenance challenges, and existing methods for dissolved oxygen removal are either ineffective or logistically difficult to implement, especially in naval aircraft.
Innovation Solution
A passive fuel additives dosing system with a membrane-based contactor is integrated into the fuel system to dispense additives on-board the vehicle, utilizing osmotic pressure to proportionally release anti-oxidants and other additives into the fuel, avoiding interference with coalescing filters and enabling improved heat sink capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additives are blended off-board at refueling truck loading racks, then additive performance is proven, but logistic challenges prevent broad implementation
Solution Approach 1:
The system enables the aircraft fuel system to self-dose additives automatically through a passive dosing cartridge that releases additives in response to fuel flow, eliminating the need for external dosing equipment at refueling operations and resolving the logistic challenges while maintaining proven additive performance
2Reliability
If additives are blended off-board, then coalescing filters may be interfered with, but on-board dosing avoids this issue
Solution Approach 1:
The passive dosing cartridge acts as an intermediary device installed in the fuel system that releases additives downstream of the coalescing filter, thereby protecting filter operation while still providing effective fuel stabilization without requiring complex integration
3Reliability
If dissolved oxygen is removed using membrane-based devices, then carbonaceous deposit formation is prevented, but the system complexity increases
Solution Approach 1:
The system uses a disposable passive dosing cartridge containing additives that prevent carbonaceous deposit formation through chemical inhibition rather than physical oxygen removal, eliminating the need for complex membrane-based oxygen removal systems while maintaining effective deposit prevention
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 prevents the formation of carbonaceous deposits by removing dissolved oxygen equivalents, enhancing heat rejection and reducing maintenance intervals, while ensuring seamless integration with existing fuel systems and avoiding logistical challenges associated with off-board additive blending.
Implementation Method 1
utilizing osmotic pressure to proportionally release anti-oxidants and other additives into the fuel
Data Source
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AI summary
A passive fuel additives dosing system (28) includes a membrane-based contactor (102) within a cartridge (100), an additive within the membrane-based contactor (102), a fuel inlet (106) to the cartridge (100) and a fuel outlet (108) from the cartridge (100). The membrane-based contactor (102) is arranged within the cartridge (100) such that, with fuel in the cartridge (100), a fuel contact area with the membrane-based contactor (102) is dependent on a fuel flow rate to passively dispense a proportional amount of the additive into the fuel.