Detonation behaviors of stoichiometric hydrogen-oxygen mixture in annular tubes with circular obstacles

•The detonation behaviors in annular tubes with circular obstacles was investigated experimentally.•Smoked foil technique was adopted to record the cellular pattern evolution.•The diffraction-retonation of detonation wave was analyzed in detail.•Special vertical bands was observed, and the formation...

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Bibliographic Details
Published in:Fuel (Guildford) 2022-04, Vol.314, p.122752, Article 122752
Main Authors: Chen, Die, Ji, Tian, He, Ze, Cao, Cheng-Ming, Ma, Hong-Hao, Wang, Lu-Qing
Format: Article
Language:English
Subjects:
Annular channel
Barriers
Cellular structure
Circular obstacle
Detonation behaviors
Detonation waves
Foils
High temperature
Mixtures
Orifice meters
Orifices
Oxygen
Periodic variations
Propagation
Propagation velocity
Stoichiometry
Transducers
Tubes
Velocity
Wave diffraction
Wave fronts
Wave propagation
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Summary:•The detonation behaviors in annular tubes with circular obstacles was investigated experimentally.•Smoked foil technique was adopted to record the cellular pattern evolution.•The diffraction-retonation of detonation wave was analyzed in detail.•Special vertical bands was observed, and the formation mechanism of which was analyzed. Experiments were performed to investigate the detonation behaviors of stoichiometric hydrogen-oxygen mixtures (at sub-atmospherical pressures) in annular tubes with circular obstacles. The annular tube was 1000 mm long and 48 mm in diameter (D). The circular obstacles were with the diameters of 37.20 mm and 30.36 mm, corresponding to the BR = 0.57, 0.36 (BR: blockage ratio), respectively. Two types of obstacle spacing S was set in the test, which are S = D and S = 2D. The detonation velocities were obtained based on the time of arrival of the wave front monitored by pressure transducers. Smoked foils were used to register the detonation cellular evolution though the test section. The results showed that the propagation limit in this test was 2ω/λ≈1(ω indicates the channel width, λ represents the cell width), which was consistent with the previous results in round tubes with orifice plates. The obstacle spacing presented no noticeable effect on detonation propagation limit. However, it played a significant role on detonation velocity. What is more, larger flow blockage for BR = 0.57 caused the more violent velocity fluctuation and higher propagation limit than in smaller blocking ratio. The process of diffraction-retonation for interaction between wave front and obstacle was analyzed in detail. In further, special vertical bands with periodic variation characteristic were observed between two adjacent obstacles. The vertical bands were spaced as same as the obstacle spacing and attached very fine cells which were caused by the head-on collision of the detonation wave propagating in the compressed region with high temperature and pressure.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2021.122752