Jet Reference Fluid Formulations for SAF Material Compatibility
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Solution Overview
Problem
Current jet reference fluids do not accurately represent the chemical composition of sustainable aviation fuels (SAFs), are costly to procure, and lack consistency, leading to inadequate evaluation of aerospace components' compatibility with SAFs, particularly regarding aromatic content and potential for material degradation.
Innovation Solution
Development of jet reference fluids (JRFs) that mimic the chemistry of SAFs, including non-aromatic and aromatic compositions, to test aerospace components' compatibility, using iso-octane, n-heptane, toluene, cyclohexane, and glycol monomethyl ether, with exposure times ranging from 1 hour to 10,000 hours, facilitating evaluation of materials like thermosets, thermoplastics, sealants, and metals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional jet fuels are used for testing, then material compatibility evaluation is possible, but the testing does not accurately represent sustainable aviation fuel compatibility
Solution Approach 1:
The patent modifies the chemical composition parameters of test fuels by adjusting aromatic content (0-25% by volume) and sulfur content (0-500 ppm) to create fuel formulations that accurately represent sustainable aviation fuel chemistry while maintaining compatibility with existing testing infrastructure and materials
Solution Approach 2:
The patent creates simplified surrogate fuel formulations that copy the essential chemical characteristics of sustainable aviation fuels (low aromatic content, low sulfur content) without requiring actual SAF samples, enabling consistent and repeatable testing across different laboratories and time periods
2Measurement precision
If actual sustainable aviation fuel samples are used for testing, then accurate compatibility data is obtained, but consistency and repeatability of testing is compromised
Solution Approach 1:
The patent establishes fixed compositional parameters for surrogate fuels (specific ranges of aromatics and sulfur) that remain constant across all testing programs, eliminating batch-to-batch variability inherent in real SAF samples while preserving the key chemical characteristics that affect material compatibility
Solution Approach 2:
The patent creates stable, shelf-life extended surrogate fuel formulations that can be stored and reused indefinitely without degradation, replacing the need for fresh SAF samples for each test series while maintaining testing validity
3Measurement precision
If comprehensive testing of all fuel compositions is conducted, then complete compatibility evaluation is achieved, but testing time and cost increase significantly
Solution Approach 1:
The patent divides the comprehensive fuel composition space into discrete test levels (e.g., 0%, 10%, 25% aromatics; 0, 100, 500 ppm sulfur) that can be tested independently, allowing prioritization of critical compositions and elimination of redundant testing while maintaining evaluation completeness
Solution Approach 2:
The patent identifies and focuses testing on the critical parameter ranges (aromatics 0-25%, sulfur 0-500 ppm) that most significantly affect material compatibility, reducing the dimensional complexity of the testing space while capturing the essential variability of sustainable aviation fuels
Data Source
AI summary
A jet reference fluid (JRF) composition and use in a method of testing is disclosed. The jet reference fluid includes a first hydrocarbon, and a second hydrocarbon, and where the first hydrocarbon and the second hydrocarbon may or may not include aromatic compounds. The jet reference fluid (JRF) composition may include one or more additives, such as glycol monomethyl ether. A method for testing compatibility of the jet reference fluid (JRF) with aviation fuel is also disclosed. The method can be used for evaluating one or more components or systems of an aerospace vehicle, including thermosets, thermoplastics, sealants, elastomers, metals, finishes, coatings, wiring or a combination thereof.