Abstract
The forced response of swirl-stabilized lean-premixed turbulent flames to acoustic oscillations in a hydrogen enriched laboratory-scale gas turbine combustor was experimentally investigated. Nonlinear flame transfer function measurements were taken to investigate the flame's heat release response to upstream acoustic perturbations. This analysis shows that the dynamics of natural gas-air premixed flames are characterized by several regimes: the linear, transition, and first and second nonlinear regimes, depending upon steady-state flame geometry, modulation frequency, and amplitude of excitation. The present results show that the flame geometry changes from a dihedral V flame to an enveloped M flame with an increase in hydrogen mole fraction, and the changes in steady-state flame structures have a significant impact on the flame's response to acoustic modulations. The present results suggest that the M flame, unlike the V flame, has the unique dynamic characteristic of acting as a damper of flow perturbations. The response of the M flame remains in the linear regime, irrespective of the shedding of a vortex-ring structure, because the interaction between the large-scale structure and the flame is not strongly coupled.
| Original language | English (US) |
|---|---|
| Title of host publication | 27th Annual International Pittsburgh Coal Conference 2010, PCC 2010 |
| Pages | 2163-2173 |
| Number of pages | 11 |
| Volume | 3 |
| State | Published - Dec 1 2010 |
| Event | 27th Annual International Pittsburgh Coal Conference 2010, PCC 2010 - Istanbul, Turkey Duration: Oct 11 2010 → … |
Other
| Other | 27th Annual International Pittsburgh Coal Conference 2010, PCC 2010 |
|---|---|
| Country/Territory | Turkey |
| City | Istanbul |
| Period | 10/11/10 → … |
All Science Journal Classification (ASJC) codes
- Geochemistry and Petrology
- Geotechnical Engineering and Engineering Geology