Much work has been done to model and understand alcohol oxidation individually. Comparative studies of ignition delay times of alcohols, however, are limited. The thesis presents a comparative study of their ignition delay times. Mixtures of methanol, ethanol, n-propanol and n-butanol and synthetic air are ignited behind reflected shock waves at high temperatures (1070K-1760K). The ignition delay times are measured in a shock tube as equivalence ratio, argon to oxygen ratio (dilution) and pressure are changed to highlight trends and similarities between the fuels. Experimental results have indicated that these fuels have comparable ignition delay times, which may indicate similarities of the oxidation pathways of the alcohols. The results are compared against simulations of chemical kinetic models from the literature. The Marinov model is found to be the most accurate of the models. However, the simulations fail to show the similarity of the delay times at fixed equivalence ratio phi, argon to oxygen ratio (dilution), D and pressure, p. Reaction rate dependency analysis of kinetic models indicate dominance of radical chemistry among the fuels and the presence of H abstraction reactions in methanol as opposed to uni-molecular fuel decompositions of larger alcohols like n-butanol. / Dans cette these, des melanges de methanol, ethanol, n-propanol et n-butanol avec de l'air synthetique sont exploses derriere une onde de choc reflechie a haute temperature (1070K-1760K) ou les temps de retard a l'allumage sont mesures a differents taux d'equivalences, dilutions, pressions et temperatures pour etablir les points de similitaritees et differences entre alcools. Beaucoup d'etudes ont ete fait pour modeliser et comprendre l'oxydation de ces derniersmais les etudes n'ont pas ete realise de maniere comparative. Ainsi, ce travail presente une etude comparative des temps de retard d'allumage des alcools simples (C1 a C4). Les resultats ont indique que ces combustibles ont des temps de retard d'allumage comparables, ce qui indique une similitaritee des voies d'oxydation des differents alcools.Des modeles cinetiques trouves dans la litterature sont compares aux resultats experimentaux. Il se trouve que celui de Marinov (1998) est le plus proches des valeurs mesurees. De plus, des analyses de dependance des taux de reactions sur les delais d'allumage sur ces modeles indiquent la dominance des reactions a base de radicaux.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.106391 |
| Date | January 2012 |
| Creators | Noorani, Khalid |
| Contributors | Jeffrey Bergthorson (Internal/Supervisor) |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Engineering (Department of Mechanical Engineering) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | Electronically-submitted theses. |
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