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Science and Technology of Energetic Materials

Vol.72, No.3 (2011)

Research paper

Experimental and numerical investigation of the effect of end venting on flame acceleration in an obstructed channel
Jorge Yanez, Alexander Lelyakin, Thomas Jordan, Victor Alekseev, and Mike Kuznetsov
p.86-89

Abstract

Hydrogen-air deflagrations with venting at the end of obstructed tubes are studied experimentally and numerically. Mixtures with 13% vol. of hydrogen were ignited from the open end of the tube at the interface between fuel and the ambient air. Three venting ratios were selected, closed, 40% and 100%. In the presence of the venting, the flame initially propagates without acceleration at a velocity close to the laminar flame speed. After an induction period, of the order of1 sec, the flame accelerates more than 100 times, within a period of 3-30 ms, until the steady-state choked regime will be established. The mechanism conducing to such a rapid acceleration was numerically investigated.

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Keywords

turbulent flames, venting, flame acceleration, explosions

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