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Experimental study of flame acceleration and the deflagration-to-detonation transition under conditions of transverse venting

Alekseev, V.I. / Kuznetsov, M.S. / Yankin, Y.G. / Dorofeev, S.B.

Results of experiments on critical conditions for flame acceleration and the deflagration-to-detonation transition in tubes with transverse venting are presented. Tests were made with hydrogen mixtures in two tubes (inner diameter of 46 and 92 mm) with obstacles. Ratios of vent area to total tube area were 0.2 and 0.4. Venting was shown to influence flame acceleration significantly. The greater the vent ratio, the more reactive the mixture necessary for development of fast flames. Critical conditions for flame acceleration in tubes with venting, expressed through a critical mixture expansion ratio sigma_cr, were found to be sigma_cr/sigma₀ nearly eqal 1 + 2 alpha, where sigma₀ is the critical value for a closed tube. Critical conditions for detonation onset in a vented tube were found to be very close to those in a closed tube with similar configuration of obstacles.

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Experimental study of flame acceleration and the deflagration-to-detonation transition under conditions of transverse venting

Alekseev, V.I. / Kuznetsov, M.S. / Yankin, Y.G. / Dorofeev, S.B.

Results of experiments on critical conditions for flame acceleration and the deflagration-to-detonation transition in tubes with transverse venting are presented. Tests were made with hydrogen mixtures in two tubes (inner diameter of 46 and 92 mm) with obstacles. Ratios of vent area to total tube area were 0.2 and 0.4. Venting was shown to influence flame acceleration significantly. The greater the vent ratio, the more reactive the mixture necessary for development of fast flames. Critical conditions for flame acceleration in tubes with venting, expressed through a critical mixture expansion ratio sigma_cr, were found to be sigma_cr/sigma₀ nearly eqal 1 + 2 alpha, where sigma₀ is the critical value for a closed tube. Critical conditions for detonation onset in a vented tube were found to be very close to those in a closed tube with similar configuration of obstacles.

Experimental study of flame acceleration and the deflagration-to-detonation transition under conditions of transverse venting

Alekseev, V.I. / Kuznetsov, M.S. / Yankin, Y.G. / Dorofeev, S.B.

Results of experiments on critical conditions for flame acceleration and the deflagration-to-detonation transition in tubes with transverse venting are presented. Tests were made with hydrogen mixtures in two tubes (inner diameter of 46 and 92 mm) with obstacles. Ratios of vent area to total tube area were 0.2 and 0.4. Venting was shown to influence flame acceleration significantly. The greater the vent ratio, the more reactive the mixture necessary for development of fast flames. Critical conditions for flame acceleration in tubes with venting, expressed through a critical mixture expansion ratio sigma_cr, were found to be sigma_cr/sigma₀ nearly eqal 1 + 2 alpha, where sigma₀ is the critical value for a closed tube. Critical conditions for detonation onset in a vented tube were found to be very close to those in a closed tube with similar configuration of obstacles.

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Title:

Experimental study of flame acceleration and the deflagration-to-detonation transition under conditions of transverse venting

Additional title:

Experimentelle Untersuchung der Flammenbeschleunigung und des Übergangs von Verpuffung zu Detonation unter Bedingungen transversaler Druckentlastung

Contributors:

Alekseev, V.I. (author) / Kuznetsov, M.S. (author) / Yankin, Y.G. (author) / Dorofeev, S.B. (author)

Published in:

International Symposium on Hazards, Prevention, and Mitigation of Industrial Explosions, 3 ; 591-596

Journal of Loss Prevention in the Process Industries ; 14

Publication date:

2001

Size:

6 Seiten, 8 Bilder, 14 Quellen

ISSN:

DOI:

https://doi.org/10.1016/S0950-4230(01)00051-1

Type of media:

Conference paper

Type of material:

Print

Language:

English

Keywords:

Detonation , Dimensionierung , Druckentlastung , Druckwelle , Explosion , Flammausbreitung , geschlossenes System , Rohr , Schallgeschwindigkeit , Symposium , Versuchsaufbau , Wasserstoff , Verpuffung , Gasexplosion

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