Experimental characterization of flame acceleration and deflagration-to-detonation transition in meso-scale tubes

Chan Yu Wang, Ming-Hsun Wu

Research output: Contribution to conferencePaper

Abstract

Reaction propagation of ethylene/oxygen and methane/oxygen mixtures in capillary tubes of 1 and 2 mm in diameters were experimentally studied. Deflagrative flame was initiated in middle of the small tube, and the reaction fronts accelerated as it propagated downstream towards the exits. Lengths of the tubes investigated ranged from 0.4 to 1 m (one side), and deflagration-to-detonation transitions were observed for all equivalence ratios with successful initiations. The visible reaction front propagates at speeds slightly below Chapman-Jouguet speed for ethylene/oxygen mixture in the 1 mm and 2 mm tubes as well as methane/oxygen mixture in the 2 mm tube after deflgration-to-detonation transition was reached. An overshoot in propagation velocity was found during transition process. However, low speed detonation and galloping detonation modes were the typical propagation modes for methane/oxygen mixtures in the 1 mm tube. Run-up distances were found to be invariant to the length of the tube.

Original languageEnglish
Publication statusPublished - 2009 Jan 1
Event7th Asia-Pacific Conference on Combustion, ASPACC 2009 - Taipei, Taiwan
Duration: 2009 May 242009 May 27

Conference

Conference7th Asia-Pacific Conference on Combustion, ASPACC 2009
CountryTaiwan
CityTaipei
Period09-05-2409-05-27

Fingerprint

deflagration
Detonation
detonation
flames
Oxygen
tubes
Methane
oxygen
methane
Ethylene
ethylene
Capillary tubes
capillary tubes
propagation modes
propagation velocity
low speed
equivalence
propagation

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Fuel Technology
  • Chemical Engineering(all)

Cite this

Wang, C. Y., & Wu, M-H. (2009). Experimental characterization of flame acceleration and deflagration-to-detonation transition in meso-scale tubes. Paper presented at 7th Asia-Pacific Conference on Combustion, ASPACC 2009, Taipei, Taiwan.
Wang, Chan Yu ; Wu, Ming-Hsun. / Experimental characterization of flame acceleration and deflagration-to-detonation transition in meso-scale tubes. Paper presented at 7th Asia-Pacific Conference on Combustion, ASPACC 2009, Taipei, Taiwan.
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Wang, CY & Wu, M-H 2009, 'Experimental characterization of flame acceleration and deflagration-to-detonation transition in meso-scale tubes', Paper presented at 7th Asia-Pacific Conference on Combustion, ASPACC 2009, Taipei, Taiwan, 09-05-24 - 09-05-27.

Experimental characterization of flame acceleration and deflagration-to-detonation transition in meso-scale tubes. / Wang, Chan Yu; Wu, Ming-Hsun.

2009. Paper presented at 7th Asia-Pacific Conference on Combustion, ASPACC 2009, Taipei, Taiwan.

Research output: Contribution to conferencePaper

TY - CONF

T1 - Experimental characterization of flame acceleration and deflagration-to-detonation transition in meso-scale tubes

AU - Wang, Chan Yu

AU - Wu, Ming-Hsun

PY - 2009/1/1

Y1 - 2009/1/1

N2 - Reaction propagation of ethylene/oxygen and methane/oxygen mixtures in capillary tubes of 1 and 2 mm in diameters were experimentally studied. Deflagrative flame was initiated in middle of the small tube, and the reaction fronts accelerated as it propagated downstream towards the exits. Lengths of the tubes investigated ranged from 0.4 to 1 m (one side), and deflagration-to-detonation transitions were observed for all equivalence ratios with successful initiations. The visible reaction front propagates at speeds slightly below Chapman-Jouguet speed for ethylene/oxygen mixture in the 1 mm and 2 mm tubes as well as methane/oxygen mixture in the 2 mm tube after deflgration-to-detonation transition was reached. An overshoot in propagation velocity was found during transition process. However, low speed detonation and galloping detonation modes were the typical propagation modes for methane/oxygen mixtures in the 1 mm tube. Run-up distances were found to be invariant to the length of the tube.

AB - Reaction propagation of ethylene/oxygen and methane/oxygen mixtures in capillary tubes of 1 and 2 mm in diameters were experimentally studied. Deflagrative flame was initiated in middle of the small tube, and the reaction fronts accelerated as it propagated downstream towards the exits. Lengths of the tubes investigated ranged from 0.4 to 1 m (one side), and deflagration-to-detonation transitions were observed for all equivalence ratios with successful initiations. The visible reaction front propagates at speeds slightly below Chapman-Jouguet speed for ethylene/oxygen mixture in the 1 mm and 2 mm tubes as well as methane/oxygen mixture in the 2 mm tube after deflgration-to-detonation transition was reached. An overshoot in propagation velocity was found during transition process. However, low speed detonation and galloping detonation modes were the typical propagation modes for methane/oxygen mixtures in the 1 mm tube. Run-up distances were found to be invariant to the length of the tube.

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Wang CY, Wu M-H. Experimental characterization of flame acceleration and deflagration-to-detonation transition in meso-scale tubes. 2009. Paper presented at 7th Asia-Pacific Conference on Combustion, ASPACC 2009, Taipei, Taiwan.