Citation

Zhang Y, Song Y, Jiang S, Li Y, Shen S, Chen Y. China Saf. Sci. J. 2019; 29(7): 33-38.

Copyright

(Copyright © 2019, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2019.07.006

PMID

unavailable

Abstract

To explore the characteristics of premixed Hydrogen/Air flame propagation in sudden expansion ducts, the flow structure, flame shape, flame speed and overpressure of flame through the ducts with various expansion angles β were numerically investigated by Flacs based on the k-ε model and the β-flame thickening model.

RESULTS shows that the premixed Hydrogen/Air flame undergoes stages of extinction and re-ignition in the sudden expansion ducts under various angles of β.The flame propagation distance in the ducts increased obviously with the angle β. Baroclinic effect can inhibit the intensity of the vortex in the flow field, and hence weaken the forward transport of fuel.This inhibit effects decrease with the expansion angle β. © 2019 China Safety Science Journal. All rights reserved.

Language: zh