摘要
通过对铝颗粒在激波后的高温热气流中由于温度升高产生的热应力进行分析计算 ,对铝颗粒的激波点火机制进行初步探讨。计算结果表明在激波后的气流中 ,铝颗粒的温度只要升高 70°C左右 ,铝颗粒的氧化层就会产生裂纹。当铝颗粒的铝完全熔化后 ,如果这时气流对颗粒的作用使得已经产生裂纹的氧化层进一步破裂并失去对铝的保护 ,铝颗粒将被点火 ;但如果此时气流对铝颗粒的作用未能使氧化层失去保护作用 ,铝颗粒的温度需达到或接近三氧化二铝的熔点时才能被点火。
The ignition of aluminum particle behind shock waves was analyzed by calculating the thermal stress distribution inside the particle. The results show that as the temperature of aluminum particle increases to about 70°C, crack is developed in the oxide film shell of the particle, and if the crack is farther enlarged by gas flow behind shock wave, the oxide film will lose its protection. In this case, aluminum particle will be ignited when the particle temperature reaches the melting point of aluminum. Otherwise the particle will be ignited at higher temperature that achieves to its oxide melting point.
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2003年第4期295-299,共5页
Explosion and Shock Waves
