Physical Mechanism of Ultrafast Flame Acceleration
Journal article, 2008

We explain the physical mechanism of ultrafast flame acceleration in obstructed channels used in modern experiments on detonation triggering. It is demonstrated that delayed burning between the obstacles creates a powerful jetflow, driving the acceleration. This mechanism is much stronger than the classical Shelkin scenario of flame acceleration due to nonslip at the channel walls. The mechanism under study is independent of the Reynolds number, with turbulence playing only a supplementary role. The flame front accelerates exponentially; the analytical formula for the growth rate is obtained. The theory is validated by extensive direct numerical simulations and comparison to previous experiments.

FLOW

DETONATION

TUBES

Author

V. Bychkov

Umeå University

D. M. Valiev

Royal Institute of Technology (KTH)

Umeå University

Lars-Erik Eriksson

Chalmers, Applied Mechanics, Fluid Dynamics

Physical Review Letters

0031-9007 (ISSN) 1079-7114 (eISSN)

Vol. 101 16 4-

Subject Categories

Mechanical Engineering

DOI

10.1103/PhysRevLett.101.164501

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Latest update

2/27/2018