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Fuel Structure Effects on Surrogate Alternative Jet Fuel Emission.pdf (16.52 MB)
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Abstract Header
Fuel Structure Effects on Surrogate Alternative Jet Fuel Emission
Author Info
Flora, Giacomo
ORCID® Identifier
http://orcid.org/0000-0001-5047-3875
Permalink:
http://rave.ohiolink.edu/etdc/view?acc_num=dayton1450286398
Abstract Details
Year and Degree
2015, Doctor of Philosophy (Ph.D.), University of Dayton, Mechanical Engineering.
Abstract
The emergence of alternative jet fuels has opened new challenges for the selection of practical alternatives that minimize the emissions and are suitable for existing gas turbine engines. Alternative jet fuels are in the early stages of development, and little fundamental emissions data are currently available. An accurate knowledge of their combustion behavior is highly important for a proper fuel selection based on emissions. This dissertation work investigated the oxidation of different alternative fuel surrogates composed of binary mixtures in order to correlate fuel composition with emissions. The proposed surrogate mixtures included n-dodecane/n-heptane (47.5/52.5 by liq. vol.), n-dodecane/iso-octane (47.9/52.1 by liq, vol.), n-dodecane/methylcyclohexane (49/51 by liq. vol.) and n-dodecane/m-xylene (75/25 by liq. vol.) mixtures. Experiments were carried out at the UDRI heated shock tube facility, and covered a pre-ignition temperature range of 950–1550 K at a pre-ignition pressure of ~16 atm, an equivalence ratio of 3, an argon concentration of 93% (by mol), and under homogeneous gas-phase conditions. Experimental data were modeled using the 2014 SERDP mechanism for jet fuel surrogates (525 species and 3199 reactions). Similar ignition delay times were measured for the tested surrogate blends, confirming previous observations regarding the controlling role of normal alkanes during the induction period. The experimental observation was also compared with modeling results reporting reasonably good agreements. A kinetic analysis of the SERDP 2014 mechanism was also performed, highlighting the major chemical pathways relevant to the pre-ignition chemistry, especially the role of the hydroperoxyl radical at the low temperatures. A wide speciation of combustion products was also carried out under the test conditions. All the aliphatic blends reported similar emissions, whereas the presence of m-xylene produced lower emissions than the aliphatic surrogate blends at lower temperatures. For certain species (light gases) this experimental observation was also supported by the kinetic mechanism predictions. However, aromatic species formed from combustion of n-dodecane/m-xylene surrogate blend were always overestimated by the model and in poor agreement with experimental observations. The results also confirmed the role of acetylene as assisting growth of large PAHs and formation of soot.
Committee
Sukhjinder S. Sidhu, Ph.D. (Committee Chair)
Kahandawala Moshan S. P, Ph.D. (Committee Member)
Dewitt Matthew J., Ph.D. (Committee Member)
Stouffer Scott, Ph.D. (Committee Member)
Pages
285 p.
Subject Headings
Mechanical Engineering
Keywords
combustion
;
jet fuel surrogates
;
ignition delay time
;
emissions
;
shock tube
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Citations
Flora, G. (2015).
Fuel Structure Effects on Surrogate Alternative Jet Fuel Emission
[Doctoral dissertation, University of Dayton]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1450286398
APA Style (7th edition)
Flora, Giacomo.
Fuel Structure Effects on Surrogate Alternative Jet Fuel Emission.
2015. University of Dayton, Doctoral dissertation.
OhioLINK Electronic Theses and Dissertations Center
, http://rave.ohiolink.edu/etdc/view?acc_num=dayton1450286398.
MLA Style (8th edition)
Flora, Giacomo. "Fuel Structure Effects on Surrogate Alternative Jet Fuel Emission." Doctoral dissertation, University of Dayton, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1450286398
Chicago Manual of Style (17th edition)
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Document number:
dayton1450286398
Download Count:
346
Copyright Info
© 2015, all rights reserved.
This open access ETD is published by University of Dayton and OhioLINK.