铝粉-空气混合物爆燃转爆轰过程及爆轰波结构  

Deflagration to Detonation Transition and Detonation Wave Structure of Aluminum-Air Mixture

作　　者：陈默[1,2] 白春华[2] 刘庆明[2] 

机构地区：[1]中国石油安全环保技术研究院,北京100083 [2]北京理工大学爆炸科学与技术国家重点实验室,北京100081

出　　处：《高压物理学报》2012年第4期426-432,共7页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(10772032);爆炸科学与技术国家重点实验室自主课题(ZDKT08-2-6;YBKT09-1)

摘　　要：在长为32.4m、内径为0.199m的大型长直水平管道中,对铝粉-空气两相流的燃烧转爆轰(DDT)过程及爆轰波结构进行了实验研究。对铝粉-空气混合物弱点火条件下DDT过程不同阶段的特征进行了分析,实验结果显示混合物经历了缓慢反应压缩阶段、压缩波加速冲击波形成阶段、冲击反应过渡阶段、冲击反应向过压爆轰过渡阶段和爆轰阶段,得到了混合物各阶段的DDT参数,由此进一步分析了DDT浓度的上、下限。在1.4m爆轰测试段的4个截面的环向上各均匀安装8个传感器,对爆轰波结果进行测试,并对铝粉-空气混合物爆轰波的单头结构进行了分析。Motivated by the current interest in the mechanism of the deflagration to detonation transition（DDT）,the DDT process and detonation wave structure of aluminum-air mixture are investigated experimentally by a large scale tube with length of 32.4 m and inner diameter of 0.199 m.The overall DDT process can be divided into slow reaction compression stage,pressure wave speed-up and shock wave formation stage,transfer from shock reaction to critical shock reaction,transfer from critical shock to overdriven detonation,and detonation stage.The optimal concentrations of mixtures in this experimental tube are obtained,and the critical concentration of DDT is also studied.Eight pressure gauges are well-distributed at each periphery of four certain sections in the 1.4 m long detonation testing tube for detonation wave testing.According to the test results,the detonation wave structure of aluminum-air mixture is analyzed,which shows single head mode.

关 键 词：燃烧转爆轰 弱点火 铝粉 自持 爆轰波 

分 类 号：O382.1[理学—流体力学]