Catalytic Fuel Tank Inerting Gas Separator for CO2 Cavitation
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Solution Overview
Problem
Catalytic oxidation in fuel tank inerting systems increases carbon dioxide levels significantly, leading to dissolved CO2 in fuel, which causes cavitation and vapor lock issues in aircraft engine fuel systems due to its high solubility and temperature-dependent evolution.
Innovation Solution
A catalytic fuel tank inerting system with a gas separator component that separates and removes dissolved carbon dioxide from the fuel stream before it reaches the engine, using membrane-based or degassing pump technologies to prevent cavitation and vapor lock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If catalytic oxidation is used to produce inert gas, then oxygen removal efficiency is improved, but carbon dioxide levels in fuel increase causing cavitation
Solution Approach 1:
The patent extracts and removes carbon dioxide from the fuel stream using a gas separator positioned downstream of the catalytic oxidizer. This separation process isolates the harmful CO2 component from the beneficial inert gas function, allowing the system to maintain both combustion prevention and cavitation-free operation.
Solution Approach 2:
The gas separator acts as an intermediary component between the catalytic oxidation process and the fuel delivery system. It mediates the harmful effect of CO2 by removing dissolved gases from the fuel before the fuel reaches the engine, preventing cavitation while preserving the inerting function.
2Object-affected harmful factors
If carbon dioxide is removed from inert gas stream, then cavitation is prevented, but system complexity increases
Solution Approach 1:
The gas separator is designed to operate autonomously using the inherent pressure differential between the fuel line and the separator chamber. The system self-regulates CO2 removal without requiring external control systems, complex sensors, or active pumping, thereby minimizing added complexity while maintaining effectiveness.
3Reliability
If gas separator is added to remove CO2, then fuel system reliability is improved, but device complexity increases
Solution Approach 1:
The gas separator utilizes a flexible membrane structure that allows dissolved gases to permeate through while retaining liquid fuel. This thin-film-based separation approach achieves effective CO2 removal with a simple, compact device design that adds minimal complexity to the fuel system.
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 reduces carbon dioxide levels in the fuel, preventing cavitation and vapor lock issues by removing dissolved CO2 prior to its evolution, ensuring stable fuel flow and system operation.
Implementation Method 1
using membrane-based or degassing pump technologies to prevent cavitation and vapor lock
Implementation Method 2
Catalytic oxidation includes burning of fuel with a catalyst with air to produce inert gas
Implementation Method 3
Catalytic oxidation includes burning of fuel with a catalyst with air to produce inert gas
Implementation Method 4
the solubility of carbon dioxide in kerosene-based fuel is much greater than oxygen or nitrogen, and the solubility of carbon dioxide decreases as the fuel temperature rises
Data Source
Figure 1A
Figure 1B
Figure 2A~2B
AI summary
A fuel tank inerting system uses a catalytic oxidation unit to combust fuel from the fuel tank (12) to produce inert gas, simultaneously working with a gas separator (52) that removes dissolved carbon dioxide from the fuel before it is cycled to the thermal management system (TMS) or the engine. This prevents cavitation of carbon dioxide (gaseous bubbling) within the fuel at varying temperatures while in flight.