On self-acceleration of cellular spherical flames

Fujia Wu, Grunde Jomaas, Chung K. Law

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

An expanding spherical flame is hydrodynamically unstable in the flame-sheet limit, attained either as the flame reaches a sufficiently large dimension as compared to the flame thickness, and/or when it propagates in a high-pressure environment such that its thickness is correspondingly reduced. The cells that continuously develop over the flame surface increase its area and thereby the global propagation rate, resulting in the possibility of self-acceleration. The present study examines whether this self-acceleration could be self-similar, and if so whether it could also be self-turbulizing. A critical appraisal of the experimental and computational results in the literature on these issues was performed, and experiments were conducted for hydrogen/air mixtures over an extensive range of elevated pressures. Results demonstrate the strong possibility of self-similar flame acceleration, moderate influences of diffusionalthermal instability and of the system pressure, and a corresponding moderate spread in the power-law acceleration exponent.

Original languageEnglish (US)
Title of host publicationFall Technical Meeting of the Eastern States Section of the Combustion Institute 2011
PublisherCombustion Institute
Pages432-450
Number of pages19
ISBN (Electronic)9781622761258
StatePublished - Jan 1 2011
EventFall Technical Meeting of the Eastern States Section of the Combustion Institute 2011 - Storrs, United States
Duration: Oct 9 2011Oct 12 2011

Publication series

NameFall Technical Meeting of the Eastern States Section of the Combustion Institute 2011

Other

OtherFall Technical Meeting of the Eastern States Section of the Combustion Institute 2011
CountryUnited States
CityStorrs
Period10/9/1110/12/11

All Science Journal Classification (ASJC) codes

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

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    Wu, F., Jomaas, G., & Law, C. K. (2011). On self-acceleration of cellular spherical flames. In Fall Technical Meeting of the Eastern States Section of the Combustion Institute 2011 (pp. 432-450). (Fall Technical Meeting of the Eastern States Section of the Combustion Institute 2011). Combustion Institute.