Study on transient reaction mechanism and explosion intensity parameters of micron-sized flake aluminum dust in air

被引：32

作者：

Jing, Qi ^{[1
]}

Wang, Dan ^{[1
,2
]}

Liu, Qingming ^{[1
]}

Ren, Lingxiao ^{[3
]}

Wang, Yanfu ^{[4
]}

Liu, Changqi ^{[1
]}

Shen, Yang ^{[1
]}

Wang, Zhisong ^{[1
]}

机构：

[1] Beijing Inst Technol, State Key Lab Explos Sci & Technol, Room 106,5 South Zhongguancun St, Beijing 100081, Peoples R China

[2] China Acad Safety Sci & Technol, Beijing Key Lab Metro Fire & Passenger Transporta, Beijing 100012, Peoples R China

[3] Tianjin Univ, Sch Chem Engn & Technol, Key Lab Green Chem Technol, State Key Lab Chem Engn,Minist Educ, Tianjin 300072, Peoples R China

[4] China Univ Petr, Coll Mech & Elect Engn, Qingdao 266580, Peoples R China

来源：

CHEMICAL ENGINEERING SCIENCE | 2021年 / 246卷

基金：

中国国家自然科学基金;

关键词：

Two-phase explosion; Transient reaction mechanism; Explosion parameter; Flame propagation; CFD SIMULATIONS; PARTICLE-SIZE; DISPERSION; COMBUSTION; POWDER; 20-L; DETONATION; MIXTURE;

D O I：

10.1016/j.ces.2021.116884

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Micron-sized flake aluminum dust has great potential in rocket propellants and advanced thermobaric weapons because of its large specific surface area. A 20 L near-spherical explosion system and a 2D simulation model are established to study the explosion intensity parameters and transient reaction details of flake aluminum dust/air two-phase explosion. The transient reaction rate of flake aluminum dust/air is mainly determined by the oxygen diffusion rate and chemical kinetic rate. Nano-sized Al2O3 products have two distribution states: some particles are dissociated in the explosion container and gradually collide and agglomerate to form a pure product block; others adhere to the surface of flake aluminum dust, which hinders the further contact between aluminum dust and air. The maximum explosion overpres-sure (9.16 bar) occurs when the aluminum dust concentration is about 400 g/m(3), and the maximum pres-sure rise rate of flake aluminum dust explosion can reach 1560 bar/s. A colorimetric thermometer is used to record the flame temperature of the gas/dust two-phase explosion and the highest flame temperature is about 3500 K. This work will provide reference for explosion protection and efficient utilization of flake aluminum dust. (C) 2021 Elsevier Ltd. All rights reserved.

引用

页数：15

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