In order to reveal the formation reasons of the steam explosion accident in the metal casting process , a simulation e-quipment for the spontaneous explosion reaction of massive molten aluminum encountering water was established .The change characteritics of temperature and the propagation laws of shock wave for the molten aluminum -water explosion system were stud-ied, and the products were collected and analyzed .The results showed that the triggering of explosion reaction was related to the relative mass ratio of aluminum-water, water temperature and other factors .The more violent the explosion , the smaller the size of the products .The maximum temperature of the explosion field was 520 K, and the attenuation of the shock wave over-pressure was faster .Under the existing conditions , the overheating metastable water , which was formed by the fragmentation and heat release of molten aluminum , would vaporize rapidly in a short time was the main reason of the explosion accident .%为了揭示金属铸造工艺中蒸汽爆炸事故形成原因,建立了大质量熔融铝液遇水自触发爆炸反应模拟装置,研究了铝液-水爆炸体系的温度变化特征和冲击波传播规律,并对产物进行回收分析.结果表明:爆炸反应的触发与铝-水的相对质量比、水温等因素相关;爆炸越剧烈,产物粒径越小;爆炸场的最高温度为520 K,且冲击波超压衰减较快;现有条件下铝液碎化放热形成过热亚稳态水,短时间内快速汽化是爆炸事故发生的主要原因.
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