Theoretical and numerical structure for unstable two-dimensional detonations

Anne Bourlioux, Andrew J. Majda

Research output: Contribution to journalArticle

Abstract

The first detailed comparison between predictions of theories for detonatios are presented here. Provided the unperturbed Z-N-D profile only exhibits instability at long transverse wavelengths with a simple stability diagram, the computed regular cell spacing is found to agree remarkably well with simple theories based on the most unstable linearized wavelengths when the channel width is not too large. Neither the geometric acoustic theories nor theories based upon a linearized unstable wavelength provide an accurate prediction of the computed cell-spacing for Z-N-D profiles with a complex stability diagram such as those that are unstable at short transverse wavelengths. Several new features of detonation instability are also documented here through the numerical simulations, including regimes exhibiting the transition to fully developed turbulence in the wake of the unstable detonation front as the activation energy and heat release are increased. Furthermore, the computations indicate that this strong turbulence contributes to the irregularity of the cellular pattern.

Original languageEnglish (US)
Pages (from-to)211-229
Number of pages19
JournalCombustion and Flame
Volume90
Issue number3-4
DOIs
StatePublished - 1992

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Detonation
detonation
Wavelength
wavelengths
Turbulence
turbulence
diagrams
spacing
profiles
predictions
cells
irregularities
wakes
Activation energy
Acoustics
activation energy
heat
acoustics
Computer simulation
simulation

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Fuel Technology
  • Mechanical Engineering

Cite this

Theoretical and numerical structure for unstable two-dimensional detonations. / Bourlioux, Anne; Majda, Andrew J.

In: Combustion and Flame, Vol. 90, No. 3-4, 1992, p. 211-229.

Research output: Contribution to journalArticle

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