We study in this thesis the influence of prescribed flows on three distinct types of flame, namely flame balls, premixed flames and triple flames. The interaction between flame propagation and fluid flow is examined using asymptotic analyses and numerical simulations of thermo-diffusive models. We consider first the effect of a flow of hot inert gas, either a source or a sink, located at the origin of flame balls. It is shown that the flow gives rise to new kinds of flame balls characterised by having nonzero burning speeds, which we refer to as generalised flame ball. The structure and stability of these flames are found to strongly depend on the direction and rate of the flow. When the flow is a source, there exist two stationary solutions, small stable flames and large unstable flames including the classical Zeldovich flame balls. When the flow is a sink, on the other hand, only large unstable flames are predicted except for sufficiently large values of the Lewis number and large negative values of the flow rate, where three flame balls exist, the medium one being stable.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:496691 |
| Date | January 2009 |
| Creators | Al Malki, Faisal Abdullah |
| Publisher | University of Manchester |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
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