White Rose University Consortium logo
University of Leeds logo University of Sheffield logo York University logo

Characterisation of reaction propagation from auto-ignition.

Bates, Luke Robert (2016) Characterisation of reaction propagation from auto-ignition. PhD thesis, University of Leeds.

This is the latest version of this item.

[img]
Preview
Text (Final Thesis)
Bates_LR_MechanicalEngineering_PhD_2016.pdf - Final eThesis - complete (pdf)
Available under License Creative Commons Attribution-Noncommercial-Share Alike 2.0 UK: England & Wales.

Download (2664Kb) | Preview

Abstract

Finite supplies of fossil fuels and their current dominance in energy production and usage make their efficient usage and the search for viable alternatives of critical importance. A large part of this is the understanding of the combustion of fuels, both existing and novel and of the engines in which they are consumed. One fundamental parameter that is not sufficiently understood is excitation time, the almost instantaneous heat release period at the end of an ignition delay period. A reduced thermokinetic model is applied to an attempt to simulate excitation without a large comprehensive model. The failure of the model in this task indicates differences in chemistry between excitation and ignition delay periods that are too large for a simple scheme to overcome with a single set of rate parameters. This work will present a full and fundamental characterisation through the use of two complimentary diagrams, one an existing diagram for the identification of developing detonation, the other for turbulent burning and adapted to this purpose for the first time. The ε/ξ diagram has been developed with additional groups and parameters which aid in identifying regimes which are potentially beneficial and also those that might be damaging. The newly developed U/K diagram additionally allows the application of the ε/ξ diagram in turbulent burning conditions. The diagrams are able to identify various combustion modes, including bounds between deflagrative and auto-ignitive propagation and operating regimes for specific engines.

Item Type: Thesis (PhD)
Related URLs:
Keywords: Octane numbers; Ignition delay times; Excitation times; Hot Spots; Developing detonation; Burning velocities; Engine knock; Chemical kinetics; Reduced model; Auto-ignition
Academic Units: The University of Leeds > Faculty of Engineering (Leeds) > School of Mechanical Engineering (Leeds) > Institute of Engineering Thermofluids, Surfaces & Interfaces (iETSI) (Leeds)
Identification Number/EthosID: uk.bl.ethos.705999
Depositing User: Mr L.R. Bates
Date Deposited: 09 Mar 2017 10:20
Last Modified: 25 Jul 2018 09:54
URI: http://etheses.whiterose.ac.uk/id/eprint/16500

Available Versions of this Item

  • Characterisation of reaction propagation from auto-ignition. (deposited 09 Mar 2017 10:20) [Currently Displayed]

You do not need to contact us to get a copy of this thesis. Please use the 'Download' link(s) above to get a copy.
You can contact us about this thesis. If you need to make a general enquiry, please see the Contact us page.

Actions (repository staff only: login required)