Abstract
This paper presents a statistical analysis of edge flames in a turbulent lifted flame using direct numerical simulation (DNS). To investigate the dynamics of edge flames, a theoretical framework describing the edge-flame propagation velocity as a function of propagation velocities of mixture fraction and product mass fraction iso-surfaces at the flame base is used. The correlations between these propagation velocities and scalar dissipation rate, orientations and gradients of product mass fraction and mixture fraction are then studied.The analysis reveals that negative edge-flame velocity, which may be interpreted as an extinction, occurs at high scalar dissipation rate. The responses of propagation velocities to scalar dissipation are explained using the correlation of contributing terms, namely the reaction, tangential and normal diffusions terms and using the statistics of alignment between product mass fraction and mixture fraction gradients.
| Original language | English |
|---|---|
| Title of host publication | International Symposium on Turbulence and Shear Flow Phenomena (TSFP-9) |
| Editors | Stovros Tavoularis |
| Place of Publication | Melbourne Vic Australia |
| Publisher | University of Melbourne |
| Chapter | P-24 |
| Pages | 1-6 |
| Number of pages | 6 |
| Publication status | Published - Jul 2015 |
| Externally published | Yes |
| Event | Turbulence and Shear Flow Phenomena 2015 - The University of Melbourne, Melbourne, Australia Duration: 30 Jun 2015 → 3 Jul 2015 Conference number: 9th http://tsfp9.org/ http://www.tsfp-conference.org/proceedings/proceedings-of-tsfp-9-2015-melbourne.html |
Conference
| Conference | Turbulence and Shear Flow Phenomena 2015 |
|---|---|
| Abbreviated title | TSFP-9 |
| Country/Territory | Australia |
| City | Melbourne |
| Period | 30/06/15 → 3/07/15 |
| Internet address |