Visualization of shock and reaction fronts during flame acceleration and transition to detonation in a small channel

Po Yuan Chiu, Chia Her Cheng, Zu Erh Chen, Ming Hsun Wu

Research output: Contribution to conferencePaperpeer-review

Abstract

Shadowgraph visualizations have been implemented in the present work to reveal interactions between shock and reaction fronts during flame acceleration and deflagration-to-detonation in small channels initially filled with stoichiometric ethylene/oxygen mixture. The results show that the flame front shape was parabolic and elongates as it propagates. A primary leading shock quickly formed, which results in the first stage of flame acceleration. The leading shock propagates at ∼ 500 m/s. As the reaction wave continue to accelerate and the propagating velocity approaches 1000 m/s, oblique shocks are observed in the corner between the parabolic-shaped flame and the sidewall, and lead to the formation of a secondary shock between the leading shock and reaction front. The secondary shock velocity decreases with decreasing channel size while the leading shock velocity remains the same. Local explosions in the boundary layer occur prior to the final surge of reaction front propagation speed to detonation velocity.

Original languageEnglish
Publication statusPublished - 2013 Jan 1
Event9th Asia-Pacific Conference on Combustion, ASPACC 2013 - Gyeongju, Korea, Republic of
Duration: 2013 May 192013 May 22

Other

Other9th Asia-Pacific Conference on Combustion, ASPACC 2013
CountryKorea, Republic of
CityGyeongju
Period13-05-1913-05-22

All Science Journal Classification (ASJC) codes

  • Environmental Engineering

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