Cellular instability in le < 1 turbulent expanding flames

Zirui Liu, Sheng Yang, Chung K. Law, Abhishek Saha

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Flow turbulence and intrinsic flamefront cellular instability can each wrinkle a flamefront and thereby increase its surface area and the corresponding global flame speed, with the characteristics of wrinkling depending on the separate and coupled spectra of their respective length scales. Extending our previous study on the interaction between turbulence and the hydrodynamic, Darrieus-Landau cellular instability, and using the same expanding, globally spherical flame as the vehicle of investigation, we report herein experimental results on the interaction between turbulence and diffusional-thermal cellular instability relevant for mixtures with sub-unity Lewis numbers. Results show that the flame acceleration is primarily controlled by cellular instability in the wrinkled flamelet regime and by turbulence in the thickened flamelet regime, respectively, while both mechanisms influence the propagation in the corrugated flamelet regime. It is also noted that while the Lewis number and thus diffusional-thermal instability does not affect the global flame acceleration, it does enhance the total burning rate.

Original languageEnglish (US)
Pages (from-to)2611-2618
Number of pages8
JournalProceedings of the Combustion Institute
Volume37
Issue number2
DOIs
StatePublished - 2019

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Mechanical Engineering
  • Physical and Theoretical Chemistry

Keywords

  • Diffusional-thermal cellular instability
  • Flame speed scaling
  • Turbulent flame

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