High-Speed Two-Dimensional Measurements of Flame Propagation Velocity and Temperature Distribution of TiH2 Dust Flame

doi:10.12382/bgxb.2021.0842

Abstract

Abstract:

In order to explore the application feasibility of hydrogen storage alloy TiH₂ in thermobaric bombs, an open and a semi-open Hartmann tube were used to simulate the explosion processes of a thermobaric bomb in the air and underground tunnels, respectively. By using the two-dimensional high-speed measurement platform on basis of the colorimetric thermometry and contour detection methods, flame characteristic parameters and influencing factors of TiH₂ dust cloud with different concentrations were studied. The experimental results showed that: in the open space, the flame temperature of TiH₂ dust was in the range of 2150-2400K, and the flame temperature decreased with the increase of dust concentration; the flame propagation velocity and acceleration were not affected by the dust concentration in the early stage, but increased with the increasing dust concentration in the later stage; in the confined space of a pipeline, the temperature of dust clouds with different concentrations of TiH₂ during stable combustion were around 2430K, and the higher the dust concentration, the shorter the flame propagation time to the top; the stable flame temperature of dust clouds in the pipeline was 50-210K higher than that in the open space, and the flame propagation velocity was 6-15 times than that in the open space. Compared with the traditional explosion testing methods, the colorimetric thermometry method can precisely measure the transient temperature distribution of a certain zone, and the contour detection method can accurately measure the propagation velocity and acceleration of flame front surface, which may provide a new technical means for the formulation design and damage effectiveness evaluation of thermobaric bombs.

Key words: thermobaric bomb, contour detection, flame speed, colorimetric thermometry

CHENG Yangfan, WANG Zhonghua, HU Fangfang, ZHANG Beibei, XIA Yu, SHEN Zhaowu. High-Speed Two-Dimensional Measurements of Flame Propagation Velocity and Temperature Distribution of TiH₂ Dust Flame[J]. Acta Armamentarii, 2023, 44(4): 1181-1192.

Figures/Tables 14

Fig.1 Particle size distribution and microstructural characteristics

Fig.2 Hartmann tubes

Fig.3 Realization process of high-speed two-dimensional measurement

Fig.4 Bayer array of high-speed cameras

Fig.5 Flame image processing

Fig.6 Flame image processing

Fig.7 Length proportional calibration experiment

Fig.8 High-speed camera photos of TiH2 dust cloud flame propagated in an open space

Fig.9 High-speed two-dimensional dynamic temperature distribution maps of TiH2 dust cloud (500g/m3) flame in an open space

Fig.10 Flame parameters of TiH2 dust with different concentrations varying with time in an open space

Fig.11 Comparison of flame parameters of TiH2 dust and Ti dust at 833g/m3 concentration

Fig.12 High-speed camera photos of TiH2 dust cloud flame propagated in a tube

Fig.13 High-speed two-dimensional dynamic temperature distribution maps of TiH2 dust cloud flame propagated in a tube

Fig.14 Flame parameters of TiH2 dust with different concentrations varying with time in a tube

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High-Speed Two-Dimensional Measurements of Flame Propagation Velocity and Temperature Distribution of TiH₂ Dust Flame

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