Mechanism of fast flame acceleration in cylindrical tubes with obstacles
Paper in proceedings, 2009

The physical mechanism of fast flame acceleration in tubes with obstacles is explained by recognizing that delayed burning between the obstacles creates a powerful jet flow which drives the acceleration. It is demonstrated theoretically and computationally that this mechanism is unlimited in time and independent of the Reynolds number, and it is much stronger and qualitatively different from the classical Shelkin mechanism of flame acceleration due to wall friction. As long as the gas compression is weak, the flame accelerates exponentially, with an enormous acceleration rate. We present formulae describing evolution of the flame tip, as well as its velocity and acceleration rate. Furthermore, it is shown that flames accelerate noticeably stronger in the axisymmetric cylindrical geometry as compared to the planar one.


V. Akkerman

Princeton University

C. K. Law

Princeton University

D. M. Valiev

Umeå University

V. Bychkov

Umeå University

Lars-Erik Eriksson

Chalmers, Applied Mechanics, Fluid Dynamics

Fall Meeting of the Eastern States Section of the Combustion Institute 2009; College Park; United States; 18 October 2009 through 21 October 2009


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