Deflagration-to-detonation transition in H2-CO-Air mixtures in a partially obstructed channel. (31st March 2021)

• Record Type: Journal Article
• Authors: Heilbronn, Daniel; Barfuss, Christoph; Sattelmayer, Thomas
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 23(2021)
• Page Start: 12372
• Page End: 12383
• Publication Date: 2021-03-31
• Subjects: Fast flames -- DDT -- Hydrogen -- Carbon monoxide -- Obstructed channel; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.12.077
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: In this study flame dynamics in homogeneous hydrogen-carbon monoxide-air (H2 -CO-air) mixtures are investigated in an explosion channel. The small scale test rig is a 6 m long channel and has a rectangular cross section of 300 x 60 mm. Obstacles with a blockage ratio of 60% and a spacing of 300 mm are placed in the first section of the channel. A 2.05 m long unobstructed section in the rear of the channel allows for investigation of sustainable propagating flames and detonations. The fuel composition is varied from 100/0 to 50/50 vol.-% H2 /CO mixtures. The overall fuel content ranges from 15 to 40 vol.-% in air aiming to obtain fast flames and deflagration-to-detonation transition (DDT). Flame speed and dynamic pressure data are evaluated. Results extend data obtained by Veser [1] and can be used for validation of numerical frameworks. Limits for fast flames and DDT in homogeneous H2 -CO-air mixtures at the given geometry are presented. Highlights: Detonations are found at higher fuel contents if CO is added to a H2 fuel. Peak pressures at fuel rich mixtures are higher at CO containing fuels. Flame acceleration and run-up distances for pure H2 and H2 /CO mixtures are similar.