TiH2粉尘火焰传播速度及温度分布的高速二维测量

doi:10.12382/bgxb.2021.0842

摘要/Abstract

摘要：

为探究储氢合金TiH₂在温压弹中应用的可行性,利用开放式和半开放式哈特曼管,分别模拟温压弹在空中和地下坑道内的爆炸过程,并利用基于比色测温和轮廓检测技术的高速二维测量平台,研究不同浓度TiH₂粉尘云火焰特征参数及其影响因素。实验结果表明:在开放空间内,TiH₂粉尘火焰温度在2150~2400K范围内,随着粉尘浓度的增加,火焰温度呈下降趋势,其初期火焰传播速度和加速度受粉尘浓度影响不大,后期随浓度的增加而增加;在管道受限空间内,不同浓度TiH₂粉尘云稳定燃烧的温度都在2430K左右,粉尘浓度越大、火焰传播到顶部所需时间越短,管道内粉尘的稳定火焰温度较开放空间内的高50~210K,其火焰传播速度是开放空间内的 6~15倍。与传统爆炸测试手段相比,比色测温方法可以准确重构某区域的瞬态温度分布云图,轮廓检测技术可以实现火焰前锋面速度和加速度的精确测量,从而为温压弹的配方设计和毁伤效能鉴定提供了一种新的技术手段。

关键词: 温压弹, 轮廓检测, 火焰速度, 比色测温

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

程扬帆, 王中华, 胡芳芳, 张蓓蓓, 夏煜, 沈兆武. TiH₂粉尘火焰传播速度及温度分布的高速二维测量[J]. 兵工学报, 2023, 44(4): 1181-1192.

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.

图/表 14

图1 粉尘粒度分布和微观结构特征

Fig.1 Particle size distribution and microstructural characteristics

图2 哈特曼管

Fig.2 Hartmann tubes

图3 高速二维测量的实现过程

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

图4 高速彩色相机的拜尔阵列

Fig.4 Bayer array of high-speed cameras

图5 火焰图形

Fig.5 Flame image processing

图6 火焰图形处理

Fig.6 Flame image processing

图7 长度比例标定实验

Fig.7 Length proportional calibration experiment

图8 敞开空间内TiH2粉尘云火焰传播高速摄像

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

图9 敞开空间内TiH2粉尘云(500g/m3)火焰传播高速二维温度动态分布

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

图10 敞开空间内不同浓度TiH2粉尘云火焰参数随时间变化

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

图11 浓度833g/m3的TiH2和Ti粉尘云火焰参数对比

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

图12 管道内TiH2粉尘云火焰传播高速摄像

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

图13 管道内TiH2粉尘云火焰传播高速二维温度动态分布

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

图14 管道内不同浓度TiH2粉尘云火焰参数随时间变化

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

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TiH₂粉尘火焰传播速度及温度分布的高速二维测量

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

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[2]	昝文涛，洪滔，董贺飞. 铝粉尘云团爆轰温压效应的数值模拟[J]. 兵工学报, 2018, 39(1): 101-110.