skip to main content
Idioma:

Investigation on the detonation propagation limit criterion for methane-oxygen mixtures in tubes with different scales

Zhang, Bo ; Liu, Hong ; Yan, Bingjian

Fuel (Guildford), 2019-03, Vol.239, p.617-622 [Periódico revisado por pares]

Kidlington: Elsevier Ltd

Texto completo disponível

Citações Citado por
  • Título:
    Investigation on the detonation propagation limit criterion for methane-oxygen mixtures in tubes with different scales
  • Autor: Zhang, Bo ; Liu, Hong ; Yan, Bingjian
  • Assuntos: Boundary conditions ; Boundary layers ; Cell size ; Criteria ; Critical pressure ; Detonation ; Detonation limits ; Divergence ; Failure analysis ; Failure mechanisms ; Instability ; Methane ; Microchannels ; Propagation ; Scaling ; Stability ; Tubes
  • É parte de: Fuel (Guildford), 2019-03, Vol.239, p.617-622
  • Descrição: •As the mixture tends to stable and the detonation propagates in micro-channel, their limit criterions are totally different from classical λ = πD.•The governing mechanisms of detonation limit both in macro-channel and micro-channel were clarified.•Our finding is an indispensable supplement of typical detonation limit criterion λ = πD, and revealed the detonation failure mechanism both in macro-/micro-channels, and unstable/stable mixtures. The detonation propagation limits of CH4-O2 mixtures (φ = 0.25–2) in a macro-channel (D = 36 mm) and in micro-channels with heights of 2 mm, 4.5 mm and 7 mm were studied. The critical pressure (pc) below which detonation cannot maintain steady propagation was measured experimentally for each mixture in different channels. At the condition of pc, the scaling between detonation cell size (λ) and tube dimension (DH) were also analyzed to explore the detonation failure mechanism in channels of macro- and micro-scale. The experimental results show that the detonation propagation limit criterion λ = πD (D is the inner diameter) holds in a macro-channel for the mixture with larger value of instability; however, the detonation instability is reduced as the mixture tends to fuel-rich condition, where this typical relation breaks down. The results indicate that the propagation limit criterion in macro-channel depends less on the boundary conditions of the tube and more on the detonation instability. In the micro-channels, because of the losses from the walls and mass divergence into the boundary layers, detonation propagates in a thinner channel with larger velocity deficit (VD), thereby increasing both the reaction zone length and the detonation cell size; therefore, λ = πD is unsuitable as a criterion of the detonation propagation limit, which suggests that for detonation propagating in the micro-channels, the propagation mechanism is mainly governed by the boundary conditions.
  • Editor: Kidlington: Elsevier Ltd
  • Idioma: Inglês
Voltar para lista de resultados

  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

Buscando em bases de dados remotas. Favor aguardar.