Ignition sensitivity and flame propagation of zirconium powder clouds
Ignition sensitivity and flame propagation of zirconium powder clouds
复制标题
锆粉云的着火敏感性和火焰传播
DOI：
10.1016/j.jhazmat.2018.11.022
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发表时间：
2019
影响因子：
13.6
通讯作者：
Li Bin
中科院分区：
文献类型：
--
作者：
Cao Yong;Su Hao;Ge Lifang;Li Yuyan;Wang Yongxu;Xie Lifeng;Li Bin
研究了初始湍流对锆粉云点火感度和火焰传播的影响。通过点火延迟时间和分散压力的变化，研究了初始湍流对锆粉爆炸的影响。分别用哈特曼装置和戈伯特-格林沃尔德炉测定了最低着火能量和最低着火温度。采用高速摄影技术对锆粉云火焰传播过程进行了研究。实验结果表明，最小点火能量在1 ~ 3 mJ之间，最小点火温度为503 K。在0.7MPa下，点火能量达到最小值30 mJ。点火能量随点火延迟时间的变化也呈现出类似的规律。最大火焰速度随分散压力的增大而增大。虽然，在火焰传播的早期阶段，最低的分散压力（0.4 MPa）的瞬时火焰速度显着高于其他两个。
The ignition sensitivity and flame propagation of zirconium powder clouds are investigated with the influence of initial turbulence. The effect of initial turbulence on the zirconium powder explosion is studied by the change of ignition delay time and dispersion pressure. Hartmann apparatus and Godbert-Greenwald furnace are used to evaluate the minimum ignition energy and minimum ignition temperature, respectively. The high-speed camera is used to analyze the flame propagation behaviors of zirconium powder cloud. The experimental results show that the minimum ignition energy is between 1 mJ and 3 mJ and minimum ignition temperature is 503 K. The ignition energy reaches the minimum value of 30 mJ at the 0.7 MPa. The ignition energy with the effect of ignition delay time has revealed the similar rule. The maximum flame speed increases with the increase of dispersion pressure. Although, the instantaneous flame speed with the lowest dispersion pressure (0.4 MPa) is significantly higher than two others in the early stage of flame propagation.