Extinction predictors in turbulent sprays
Article
Article Title | Extinction predictors in turbulent sprays |
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ERA Journal ID | 3709 |
Article Category | Article |
Authors | |
Author | Wandel, Andrew P. |
Journal Title | Proceedings of the Combustion Institute |
Journal Citation | 34 (1), pp. 1625-1632 |
Number of Pages | 8 |
Year | 2013 |
Place of Publication | Philadelphia, PA. United States |
ISSN | 0082-0784 |
1540-7489 | |
1873-2704 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.proci.2012.07.037 |
Abstract | A Direct Numerical Simulation (DNS) study has been conducted into droplets evaporating and burning under the influence of a spark. Specifically, underlying physical causes behind configurations globally extinguishing or failing to ignite have been investigated. It has been found that the global mixture fraction mean and standard deviation need to be sufficiently large (i.e. sufficient fuel must have evaporated to be available for mixing) in order for a flame to be sustained, with the standard deviation a more universal measure of success. In addition, a predictor to extinction has been identified: successful flames have a substantially large region containing hot products with low scalar dissipation rate. This stable region forms a kernel that is able to supply sufficient heat to promote flame propagation without depleting too quickly. In contrast, flows that fail to ignite never form a region containing hot products, while flows that are about to globally extinguish do not have a region with low scalar dissipation within the hot products. This predictor was also observed in the equivalent partially-premixed gaseous configuration. These indicators were found to be |
Keywords | spray; DNS; spark ignition; extinction predictor; scalar dissipation rate |
ANZSRC Field of Research 2020 | 401703. Energy generation, conversion and storage (excl. chemical and electrical) |
401213. Turbulent flows | |
401204. Computational methods in fluid flow, heat and mass transfer (incl. computational fluid dynamics) | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Computational Engineering and Science Research Centre |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q1v15/extinction-predictors-in-turbulent-sprays
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