Experimental study of premixed syngas/air flame deflagration in a closed duct

• DOI: 10.1016/j.ijhydene.2018.05.103
• Publication Date: 2018-06-06T13:10:57Z
• Authors: Minggao Yu; Xufeng Yang; Kai Zheng; Ligang Zheng; Xiaoping Wen
• Keywords: Deflagration; Flame speed; Laminar flame speed; Overpressure; Equivalence ratio

Abstract The propagation behaviour of a deflagration premixed syngas/air flame over a wide range of equivalence ratios is investigated experimentally in a closed rectangular duct using a high-speed camera and pressure transducer. The syngas hydrogen volume fraction, φ, ranges from 0.1 to 0.9. The flame propagation parameters such as flame structure, propagation time, velocity and overpressure are obtained from the experiment. The effects of the equivalence ratio and hydrogen fraction on flame propagation behaviour are examined. The results indicate that the hydrogen fraction in a syngas mixture greatly influences the flame propagation behaviour. When φ, the hydrogen fraction, is ≥0.5, the prominently distorted tulip flame can be formed in all equivalence ratios, and the minimum propagation time can be obtained at an equivalence ratio of 2.0. When φ