Facilitated ignition in turbulence through differential diffusion

Fujia Wu, Abhishek Saha, Swetaprovo Chaudhuri, Chung K. Law

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Contrary to the belief that ignition of a combustible mixture by a high-energy kernel is more difficult in turbulence than in quiescence because of the increased dissipation rate of the deposited energy, we experimentally demonstrate that it can actually be facilitated by turbulence for mixtures whose thermal diffusivity sufficiently exceeds its mass diffusivity. In such cases, turbulence breaks the otherwise single spherical flame of positive curvature, and hence positive aerodynamics stretch, into a multitude of wrinkled flamelets subjected to either positive or negative stretch, such that the intensified burning of the latter constitutes local sources to facilitate ignition.

Original languageEnglish (US)
Article number024503
JournalPhysical review letters
Volume113
Issue number2
DOIs
StatePublished - Jul 9 2014

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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