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, Vol. 157, Issue 5; Other Information: Elsevier Ltd. All rights reserved; ISSN 0010-2180
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
FLAMES
ACCELERATION
MACH NUMBER
EXPLOSIONS
AXIAL SYMMETRY
CYLINDRICAL CONFIGURATION
REYNOLDS NUMBER
COMPRESSIBILITY
COMBUSTION
VELOCITY
FLAME PROPAGATION
COMPUTERIZED SIMULATION
DUCTS
DISTURBANCES
Flame-obstacle interaction
Deflagration-to-detonation transition