摘要
对铝颗粒在激波后气流作用下的点火进行了理论分析 ,用三个不同的判据得到铝颗粒点火的延时曲线并与实验进行了比较。理论分析结果表明 ,铝颗粒可以在远低于Al2 O3 的熔点被点火 ,甚至只要在铝的熔点时就被点火。提出的铝颗粒在温度达到铝的熔点且铝完全熔化时被点火这个判据在一些条件下与实验符合很好。如果铝颗粒表面的氧化层较厚 ,则点火温度为氧化铝的熔点。
The ignition of aluminum particles behind shock waves is analyzed with three different criteria. Ignition delay time with different Mach number of incident shock waves is obtained and compared with experimental results. Theoretical results showed that aluminum particles are ignited at the temperature much lower than the melting point of aluminum oxide in the flow field behind shock waves. In this work it is assumed that aluminum particles are ignited as their temperature reaches the melting point of aluminum and all of the aluminum of particles are melted behind shock waves. The ignition delay time obtained by this criterion is best agreed with experimental results. If oxided layer on particle surface is thick enough, its ignition temperature is at the melting point of aluminum oxide.
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2002年第1期35-39,共5页
Explosion and Shock Waves
基金
中国工程物理研究院基金项目 (2 0 0 0 0 10 9)
