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Title: Fundamental characterisation of the flame propagation of synthetic fuels
Author: Al-Mughanam, Tawjiq Abdulaziz U.
Awarding Body: University of Leeds
Current Institution: University of Leeds
Date of Award: 2013
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The depletion of fossil fuels has resulted in a growing need of developing an understanding of the alternative fuels which can be produced artificially. This thesis aims at describing key combustion characteristics of such future fuels, including those from bio sources and those synthetically produced using the Fischer-Tropsch process. The important characteristics of fuels are reviewed, with particular on the safety of stored fuels and those properties that are relevant to well-controlled combustion. With regard to the former, particular consideration is given to the safety of aircraft fuels and, with regard to the latter, to the laminar burning velocities and Markstein lengths of blended mixtures. These were measured with high speed photography during explosion in a fan-stirred bomb. The fuels studied include iso-octane, n-heptane, toluene, 1-hexene and ethanol in binary, tertiary and quaternary blends. Measurements were at atmospheric pressure and an initial temperature of 1'., = 360K, at equivalence ratios between 0.9 and 1.2. Values of burning velocity predicted by a variety of blending laws, which are first reviewed in some detail, are compared. A new blending law for laminar burning velocity has been proposed. This is based on the product of the burning velocity and the heat of reaction of a mole of mixture. This, and one based on the mole weighting of the burning velocity temperatures of the mixtures to be blended were the most successful predictors. In addition, a new mole weighting method was developed for predicting Markstein lengths. A good test for a blending law is its ability to deal with primary mixtures with very different chemical kinetics and burning velocities. (lonsequently, in addition to the liquid hydrocarbon fuels, the difference blending laws were applied to hydrogen/air and methane/air mixtures and their blends at atmospheric pressure and an initial temperature of 298K, with equivalence ratios ranging from 0.6 to 1.0. This study employed the expermintal data of different other researchers. Whereas, for liquid hydrocarbon fuels, five blending laws give similar predicted values of burning velocity to within 4%, the hydrogen/methane blends were a more exacting test. Several of the laws including the present laws had large errors, but the ~ blending law was successful, with an error of less than 10% for all the Groups of mixtures studied.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available