Conference proceeding
Year 2 of the National Jet Fuels Combustion Program: Towards a Streamlined Alternative Jet Fuels Certification Process
American Institute of Aeronautics and Astronautics. AIAA Meeting Papers
AIAA Aerospace Sciences Meeting, 55 (Grapevine, Texas, 01/09/2017–01/13/2017)
01/01/2017
Handle:
https://hdl.handle.net/2376/121154
Appears in Aviation Sustainability Center (ASCENT)
Abstract
The use of jet fuels from alternative, non-conventional, feedstocks is a key component of reducing the carbon intensity of aviation transportation and diversifying fuel sources. One of the key challenges in the use of these alternative fuels is the laborious and uncertain fuel certification process. To date, the certification of alternative jet fuels is costly, requiring significant resources, including fuel intensive tests that are variable in scope, and lengthy times required for certification. As a result, the FAA, NASA, AFRL, and AFOSR established an international joint federal, academic, and industrial program aimed at streamlining this process to facilitate market penetration of alternative jet fuels called the National Jet Fuels Combustion Program (NJFCP)1. The NJFCP utilizes various conventional, alternative fuels, and designed fuels to test the combustion performance of fuels. Here we report recent 1) strategic programmatic progress and 2) a brief summary of technical results reported in other submitted AIAA 2017 SciTech papers. Programmatically, the computational/theoretical Figure of Merit (FOM) mapping of Lean Blow Out (LBO) has been identified as the primary objective of the program, requiring new tasks not initially identified in Colket et al.1:
• the development of general fuel modeling capabilities (a so-called Fuel X approach),
• modeling approaches for use in OEM engineering standard work,
• and the development of new experimental capabilities (e.g. additional swirler geometries and temperature-pressure regimes).
Key technical contributions from the individual principle investigator teams2–21 are summarized as:
• fundamental experimental and computational chemistry work has shown that ignition and speciation measurements are most sensitive to the iso-alkane fraction of the fuel where the ratio of isobutene to ethylene appears to influence combustor performance5,14,19,
• reacting and non-reacting Sauter Mean Diameter (SMD) measurements suggest values near 25 and 42 µm respectively with fuel variations attributing as much as 15% variation2,4,
• and one fuel has been shown to contribute the greatest LBO sensitivity in advanced combustion rig testing11, while another fuel was shown to be most sensitive to ignition phenomena8.
These reported results are preliminary and are subject to subsequent additional experimental confirmation and modeling investigations. The program looks to involve more analytical cross-experiment analysis and additional testing to aid in separating the physical and chemical effects in combustor performance.
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Details
- Title
- Year 2 of the National Jet Fuels Combustion Program: Towards a Streamlined Alternative Jet Fuels Certification Process
- Creators
- Joshua S. Heyne - University of DaytonMeredith B. ColketMohan GuptaAniel Jardines - Federal Aviation AdministrationJeffrey P. Moder - Glenn Research CenterJames T. Edwards - Air Force Research LaboratoryMelvyn Roquemore - Air Force Research LaboratoryChiping Li - AIRMark Rumizen - Federal Aviation Administration
- Publication Details
- American Institute of Aeronautics and Astronautics. AIAA Meeting Papers
- Conference
- AIAA Aerospace Sciences Meeting, 55 (Grapevine, Texas, 01/09/2017–01/13/2017)
- Academic Unit
- Aviation Sustainability Center (ASCENT); Alternative Jet Fuel
- Publisher
- American Institute of Aeronautics and Astronautics
- Grants
- 13-C-AJFE-UD-004, Federal Aviation Administration (United States, Washington) - FAA
- Identifiers
- 99900621893601842
- Language
- English
- Resource Type
- Conference proceeding