Abstract
Detonation experiments in H2–NO2/N2O4–Ar mixtures (Equivalence ratio 1.2 and initial pressure lower than 0.1 MPa) confined in a tube of internal diameter 52 mm reveal two propagation regimes depending on initial pressure: (1) a quasi-CJ regime is observed along with a double cellular structure at high pressures; (2) at lower pressures, a low velocity detonation regime is observed with a single structure. Transition between this two regimes happens when the spinning detonation of the larger cell vanishes. Each detonation regime is characterized by velocity and pressure measurements and cellular structure records. Coherence between all experimental data for each experiment leads in assumption that losses are responsible for the transition between one regime to another. In a second part, we study such behaviour for a two-step mixture through numerical simulations using a global two-step chemical kinetics and a simple losses model. Numerical simulations qualitatively agree with experiments. Both detonation regimes with their own cellular structures are reproduced.
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Abbreviations
- c v :
-
Heat capacity at constant volume
- d :
-
Channel width or tube diameter
- D :
-
Detonation velocity
- E :
-
Total energy
- Ea i :
-
Activation energy of reaction i
- n i :
-
Order of reaction i
- p :
-
Pressure
- p 0,t :
-
Initial pressure where transition is observed
- Q i :
-
Heat of reaction of step i
- R :
-
Perfect gas constant
- T :
-
Temperature
- \({\overrightarrow{V}}\) :
-
Particle velocity
- x i :
-
Mole number of species i
- X i :
-
Molar fraction of species i
- Y i :
-
Mass fraction of species i
- Z i :
-
Pre-exponential factor of reaction i
- W m :
-
Molecular weight
- \({\phi}\) :
-
Equivalence ratio
- γ :
-
Polytropic coefficient c p /c v
- λ:
-
Detonation cell size
- ρ :
-
Density
- σ :
-
Thermicity
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Communicated by L. Bauwens.
This paper is based on work that was presented at the 22nd International Colloquium on the Dynamics of Explosions and Reactive Systems, Minsk, Belarus, July 27–31, 2009.
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Virot, F., Khasainov, B., Desbordes, D. et al. Two-cell detonation: losses effects on cellular structure and propagation in rich H2–NO2/N2O4–Ar mixtures. Shock Waves 20, 457–465 (2010). https://doi.org/10.1007/s00193-010-0283-x
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DOI: https://doi.org/10.1007/s00193-010-0283-x