Two-dimensional numerical simulation on galloping detonation in a narrow channel

Nobuyuki Tsuboi, Youhi Morii, A. Koichi Hayashi

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

The numerical simulations of the two-dimensional galloping detonation performed by using two-dimensional full Navier-Stokes simulations with a detailed chemistry model are presented. The detonation in a narrow channel with d = 5 mm, which is approximately twice the half-reaction length of hydrogen, shows a feature of galloping detonation with two initiations during its propagation under the laminar flow assumption. The distance between these two initiations is approximately 1300 mm, which causes the induction time behind the leading shock wave. As the channel width increases, the galloping feature diminishes. The detonation propagates approximately 4% lower than DCJ for d = 10 and 15 mm. By increasing the channel width, the strength of the detonation increases, as shown in the maximum pressure histories. The effects of turbulence behind the detonation show that the galloping feature disappears, although its propagation velocity becomes 0.9 DCJ. The strength of the detonation becomes significantly weak compared with the detonation propagating in the wide channel widths, and this feature is similar to the laminar assumption. The trend of the velocity deficits in the NS simulations agrees fairly well with the trend of the modified ZND calculations with η = 0.25.

Original languageEnglish
Pages (from-to)1999-2007
Number of pages9
JournalProceedings of the Combustion Institute
Volume34
Issue number2
DOIs
Publication statusPublished - 2013 Jan 11
Externally publishedYes

Keywords

  • Detonation limit
  • Galloping detonation
  • Navier-Stokes simulation
  • Velocity deficit

ASJC Scopus subject areas

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

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