An experimental study of vortex-flame interaction in counterflow spray diffusion flames

V. S. Santoro, D. C. Kyritsis, A. Gomez

Research output: Contribution to journalArticlepeer-review


The combination of formaldehyde PLIF and Phase Doppler measurements was used to study the extinction behavior of methanol counterflow spray diffusion flames. Extinction was quasi-steadily caused by progressively increasing the flow rates of oxidizer and fuel side, and unsteadily, by generating a vortex on the oxidizer side. Vortex-induced extinction yielded values of extinction strain rates a factor of two larger than the quasi-steady values. The time scales involved in the process were estimated to phenomenologically explain the greater ″robustness″ of the spray flame under unsteady perturbation. The vortex showed unsteady effects in the outer diffusive-convective flame layer. Since the characteristic chemical time was much smaller than the characteristic unsteady time, the inner reactive-diffusive layer behaved in a θuasi-steady″ manner. A measurement of the thickness of the mixing layer based on formaldehyde PLIF provided a convenient way of comparing the scalar dissipation rate and the Damkhoeler number between the two extinction modes, avoiding the need of detailed species measurements for the evaluation of the scalar dissipation and its gradients. This comparison revealed that the difference between the two extinction modes was reduced to 25% on the average. The comparison of the time delay between the onset of extinction and re-ignition between spray flames and gaseous flames exhibited that spray flames have much longer time delays. Original is an abstract.

Original languageBritish English
Pages (from-to)44
Number of pages1
JournalInternational Symposium on Combustion Abstracts of Accepted Papers
Issue numberA
StatePublished - 2000
Event28th International Symposium on Combustion - Edinburgh, United Kingdom
Duration: 30 Jul 20004 Aug 2000


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