Abstract
The stabilization mechanism of lifted flames in the near field of coflow jets has been investigated experimentally and numerically for methane fuel diluted with nitrogen. The lifted flames were observed only in the near field of coflow jets until blowout occurred in the normal gravity condition. To elucidate the stabilization mechanism for the stationary lifted flames of methane having the Schmidt number smaller than unity, the behavior of the flame in the buoyancy-free condition, and unsteady propagation characteristics after ignition were investigated numerically at various conditions of jet velocity. It has been found that buoyancy plays an important role for flame stabilization of lifted flames under normal gravity, such that the flame becomes attached to the nozzle in microgravity. The stabilization mechanism is found to be due to the variation of the propagation speed of the lifted flame edge with axial distance from the nozzle in the near field of the coflow as compared to the local flow velocity variation at the edge.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 339-347 |
| Number of pages | 9 |
| Journal | Proceedings of the Combustion Institute |
| Volume | 30 |
| Issue number | 1 |
| DOIs | |
| State | Published - 2005 |
| Externally published | Yes |
| Event | 30th International Symposium on Combustion - Chicago, IL, United States Duration: Jul 25 2004 → Jul 30 2004 |
Bibliographical note
Publisher Copyright:© 2004 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
Keywords
- Bibrachial flame
- Coflow jet
- Edge flame
- Lifted flame
- Tribrachial flame
ASJC Scopus subject areas
- General Chemical Engineering
- Mechanical Engineering
- Physical and Theoretical Chemistry