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Physical Mechanism of Ultrafast Flame Acceleration

V. Bychkov ; D. Valiev ; Lars-Erik Eriksson (Institutionen för tillämpad mekanik, Strömningslära)
Physical Review Letters (0031-9007). Vol. 101 (2008), 16, p. 4.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: FLOW, DETONATION, TUBES



Denna post skapades 2009-10-28. Senast ändrad 2016-08-17.
CPL Pubid: 100899

 

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Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Strömningslära

Ämnesområden

Teknisk mekanik

Chalmers infrastruktur