Study on the characteristics and mechanisms of secondary explosions involving deposited magnesium hydride dust induced by hydrogen explosions

DIAO Shoutong; LI Haitao; YU Minggao; WANG Jiachen; YAO Yihao; Hu Gege; WEI Chengcai

doi:10.11949/0438-1157.20260570

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Study on the characteristics and mechanisms of secondary explosions involving deposited magnesium hydride dust induced by hydrogen explosions

更新时间：2026-05-20

- Study on the characteristics and mechanisms of secondary explosions involving deposited magnesium hydride dust induced by hydrogen explosions
- CIESC Journal (2026)
- 作者机构：
  
  1.重庆大学资源与安全学院，重庆 400030
  2.重庆大学国家储能技术产教融合创新平台，重庆 400030
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20260570
  CLC： TK 91
- Received：20 April 2026，
  
  Revised：2026-05-20，
  
  Accepted：20 May 2026，
- 稿件说明：
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DIAO Shoutong, LI Haitao, YU Minggao, et al. Study on the characteristics and mechanisms of secondary explosions involving deposited magnesium hydride dust induced by hydrogen explosions[J/OL]. CIESC Journal, 2026.
DOI：

DIAO Shoutong, LI Haitao, YU Minggao, et al. Study on the characteristics and mechanisms of secondary explosions involving deposited magnesium hydride dust induced by hydrogen explosions[J/OL]. CIESC Journal, 2026. DOI： 10.11949/0438-1157.20260570.

摘要

为揭示氢气初次爆炸诱导沉积氢化镁粉尘卷扬及二次爆炸的演化规律，依托水平可视化受限管道实验平台，研究了不同氢气体积分数及障碍物条件下氢气/沉积氢化镁两相体系的爆炸压力、火焰传播、粉尘卷扬和流场结构特征。结果表明：随氢气体积分数增加，体系最大爆炸压力、最大压升速率及粉尘卷扬高度显著提高，压力峰值出现时间明显提前。其中，无障碍物条件下λ = 0.30时最大爆炸压力达到603 kPa，粉尘峰值卷扬高度达到71 mm。沉积氢化镁粉尘卷扬经历初始抬升和强化卷吸两个阶段，传播火焰进入悬浮粉尘区后可诱发二次爆炸。障碍物通过增强剪切、回流和尾迹旋涡作用，进一步促进粉尘再悬浮、火焰加速和局部强化燃烧，显著提高体系危险性。研究结果可为镁基固态储氢材料储运过程的风险评估与安全防控提供依据。

Abstract

To clarify the evolution of dust entrainment and secondary explosions induced by an initial hydrogen explosion

a horizontal visualized confined duct was established to investigate the pressure response

flame propagation

and entrainment behavior of a hydrogen/deposited MgH

two-phase system under different hydrogen volume fractions and obstacle conditions. The results show that as the volume fraction of hydrogen increases

the maximum explosion pressure

the maximum pressure rise rate and the dust lofting height of the system increase significantly

and the time when the pressure peak appears is obviously advanced. Among them

under the condition without obstacles

when λ = 0.30

the maximum explosion pressure reaches 603 kPa

and the peak height of dust lofting reaches 71 mm. The entrainment of deposited MgH

dust was not instantaneous

but developed through two successive stages

namely initial lifting near the wall and subsequent intensified entrainment accompanied by interfacial instability and gas-solid mixing. After the propagating hydrogen flame entered the suspended dust region

the entrained MgH

dust cloud was ignited

resulting in a gas-particle secondary explosion. Under obstacle conditions

the local flow field was strongly altered by blockage

shear-layer development

separation flow

and wake recirculation

which promoted dust resuspension

inten

sified flame distortion and local combustion

and consequently increased the explosion severity. These findings indicate that the hazard evolution of the hydrogen/deposited MgH

system is essentially a chain-coupled process involving primary gas-phase explosion

deposited dust entrainment

unsteady gas-solid mixing

and secondary ignition. The study provides experimental support for risk assessment and safety protection in the storage

transportation

and application of magnesium-based solid-state hydrogen storage materials.

关键词

Keywords

references

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