Flame acceleration in channels with obstacles in the deflagration-to-detonation transition
- Department of Physics, Umea University, 901 87 Umea (Sweden)
- Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544-5263 (United States)
- Department of Applied Mechanics, Chalmers University of Technology, 412 96 Gothenburg (Sweden)
It was demonstrated recently in Bychkov et al. [Bychkov et al., Phys. Rev. Lett. 101 (2008) 164501], that the physical mechanism of flame acceleration in channels with obstacles is qualitatively different from the classical Shelkin mechanism. The new mechanism is much stronger, and is independent of the Reynolds number. The present study provides details of the theory and numerical modeling of the flame acceleration. It is shown theoretically and computationally that flame acceleration progresses noticeably faster in the axisymmetric cylindrical geometry as compared to the planar one, and that the acceleration rate reduces with increasing Mach number and thereby the gas compressibility. Furthermore, the velocity of the accelerating flame saturates to a constant value that is supersonic with respect to the wall. The saturation state can be correlated to the Chapman-Jouguet deflagration as well as the fast flames observed in experiments. The possibility of transition from deflagration-to-detonation in the obstructed channels is demonstrated. (author)
- OSTI ID:
- 21305718
- Journal Information:
- Combustion and Flame, Journal Name: Combustion and Flame Journal Issue: 5 Vol. 157; ISSN CBFMAO; ISSN 0010-2180
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ACCELERATION
AXIAL SYMMETRY
COMBUSTION
COMPRESSIBILITY
COMPUTERIZED SIMULATION
CYLINDRICAL CONFIGURATION
DISTURBANCES
DUCTS
Deflagration-to-detonation transition
EXPLOSIONS
FLAME PROPAGATION
FLAMES
Flame-obstacle interaction
MACH NUMBER
REYNOLDS NUMBER
VELOCITY