Influence of Acoustic Forcing on the Transition from Flame Stabilization to Flashback at Channel Exits

• Applicant: Professor Dr.-Ing. Thomas Sattelmayer
• Subject Area: Fluid Mechanics ; Energy Process Engineering
• Term: from 2015 to 2019
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 272154358

In the past, combustion instabilities and flame flashback have been considered to be two entirely different research subjects. For this reason, the novel aspect of the proposal lies in the investigation of the interaction of both topics: An experimental study of acoustic fields (=thermoacoutics) on flame flashback in flat channels of high aspect rations is proposed. For this purpose acoustic forcing of the flow with loudspeakers will be applied. In the first phase, the influence of the acoustic velocity perturbations on the flashback limits will be measured. The second phase is then focussed on the detailed investigation of the transition with laser optical methods in order to provide the basic understanding of the phenomena resulting from pulsating flow. Finally a flashback model will be developed, which incorporates the influence of the acoustics on flashback.

• DFG Programme: Research Grants