Dropping the hammer: Examining impact ignition and combustion using pre-stressed aluminum powder

2017 ◽  
Vol 122 (12) ◽  
pp. 125102 ◽  
Author(s):  
Kevin J. Hill ◽  
Juliusz Warzywoda ◽  
Michelle L. Pantoya ◽  
Valery I. Levitas
Keyword(s):  
Aluminum Powder ◽  
Ignition And Combustion

Mechanisms of prompt and delayed ignition and combustion of explosively dispersed aluminum powder

2021 ◽  
Vol 33 (11) ◽  
pp. 113308
Author(s):  
Jacob W. Posey ◽  
Brayden Roque ◽  
Swagnik Guhathakurta ◽  
Ryan W. Houim
Keyword(s):  
Aluminum Powder ◽  
Ignition And Combustion ◽  
Dispersed Aluminum

scholarly journals Effects of Aluminum Powder on Ignition Performance of RDX, HMX, and CL-20 Explosives

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Xiaoxiang Mao ◽  
Longfei Jiang ◽  
Chenguang Zhu ◽  
Xiaoming Wang
Keyword(s):  
Energy Release ◽  
Aluminum Powder ◽  
High Explosives ◽  
Complete Reaction ◽  
Initial Stage ◽  
Al Composite ◽  
Lower Temperature ◽  
Ignition And Combustion ◽  
Composite Explosives ◽  
Temperature Area

As a kind of high explosives, aluminized explosive cannot release the energy maximumly, which is a key problem. Using DTA-TG equipment, the ignition performance of three kinds of aluminized explosives (RDX, HMX, and CL-20) with different mass percentages of aluminum powder (0%, 10 wt.%, 20 wt.%, and 30 wt.%) was investigated. The results showed that the energy release of the HMX/Al composite explosive with 10 wt.%, 20 wt.%, and 30 wt.% aluminum powder was only equivalent to 80%, 65%, and 36% of pure HMX, respectively. It was similar to RDX/Al and CL-20/Al composite explosives, except the CL-20/Al mixture with 10% aluminum powder. Rather than participating in the ignition and combustion, the aluminum powder does effect the complete reaction of RDX, HMX, and CL-20 in the initial stage of ignition or in the lower temperature area of the boundary.

scholarly journals Effects of Moisture Content on the Minimum Explosible Concentration of Aluminum Powder and the Related Mechanism

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Haiyan Chen ◽  
Qingguo Yao ◽  
Qiqi Liu ◽  
Hao Liu ◽  
Xinyan Zhang
Keyword(s):  
Moisture Content ◽  
Aluminum Powder ◽  
Combustion Process ◽  
Dilution Effect ◽  
Endothermic Effect ◽  
Aluminum Powders ◽  
Factors Affecting ◽  
Ignition And Combustion ◽  
Explosion Test ◽  
Burn Rate

Aluminum powder has been widely applied to various industries. However, its high activity and high burn rate can cause serious explosion risks. Many factors affecting the explosion of aluminum powder have been determined, yet moisture content has not been included. In the present work, the minimum explosible concentrations of aluminum powders with different moisture contents were measured with a 20-liter explosion test apparatus using the explosion accident in Kunshan, China, as a study case. The experimental results suggest that the minimum explosible concentration of aluminum powder dramatically increases with the increase of its moisture content first and the increasing trend becomes slower as the moisture content further increased. The oxidation time has no significant effects on the minimum explosible concentration of aluminum power in 8 hours at room temperature. Further investigation suggests that the moisture lowers the explosion risk of aluminum powder by altering its surface oxide film, ignition, and combustion process. The low contents of moisture in the range of 0%-8% increase the minimum explosible concentration of aluminum powder by inhibiting the reaction kinetics and particle agglomeration, while high contents of moistures in the range of 8%-20% affect the minimum explosible concentration by the endothermic effect and oxygen dilution effect.

scholarly journals The effects of additives on the combustion characteristics of aluminum powder in steam

RSC Advances ◽  
2017 ◽  
Vol 7 (10) ◽  
pp. 5725-5732 ◽  
Author(s):  
Baozhong Zhu ◽  
Fan Li ◽  
Yunlan Sun ◽  
Qichang Wang ◽  
Yuxin Wu ◽  
...  
Keyword(s):  
Ammonium Perchlorate ◽  
Aluminum Powder ◽  
Combustion Process ◽  
Combustion Characteristics ◽  
Ignition And Combustion ◽  
Different Levels

To develop the combustion characteristics of aluminum powder in steam, the ignition and combustion process of aluminum powder with different additives (KBH4, ammonium perchlorate (AP) and NaCl) addition at different levels were studied using a transparent pipe furnace.

Effects of Different Additives on the Ignition and Combustion Characteristics of Micrometer-Sized Aluminum Powder in Steam

2017 ◽  
Vol 31 (8) ◽  
pp. 8674-8684 ◽  
Author(s):  
Baozhong Zhu ◽  
Fan Li ◽  
Yunlan Sun ◽  
Yuxin Wu ◽  
Qichang Wang ◽  
...  
Keyword(s):  
Aluminum Powder ◽  
Combustion Characteristics ◽  
Ignition And Combustion
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