Abstract
The objective of this paper is to investigate the stabilisation mechanism in a partially premixed lifted flame using a three-dimensional Direct Numerical Simulation (DNS) with one step chemistry. A slot jet flame is studied with a Reynolds number of 4500 with ambient uniform temperature at the inlet. In this paper, the flame base is defined as the closest location to the inlet with the maximum reaction rate. The streamwise and transverse temporal evolution of the flame base are extracted to examine the steadiness of the flame base. The flame base is analysed using the Flame Index (FI) approach to determine whether the flame base is a premixed flame or a non-premixed flame. The conditional average of scalar dissipation rate on mixture fraction is studied to address the concept of stabilisation by scalar dissipation concept. In addition, the conditional average of reaction rate and temperature on mixture fraction are used to study the structure of the flame base. It is shown the flame is stabilised mainly due to the presence of a premixed flame at the flame base.
| Original language | English |
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| Title of host publication | Proceedings of the 9th Asia-Pacific Conference on Combustion, ASPACC 2013 |
| Publisher | Korean Society of Combustion |
| Publication status | Published - 2013 |
| Externally published | Yes |
| Event | Asia Pacific Conference on Combustion 2013 - Gyeongju, Korea, South Duration: 19 May 2013 → 22 May 2013 Conference number: 9th |
Conference
| Conference | Asia Pacific Conference on Combustion 2013 |
|---|---|
| Abbreviated title | ASPACC 2013 |
| Country/Territory | Korea, South |
| City | Gyeongju |
| Period | 19/05/13 → 22/05/13 |