C_2H_2-O_2-Ar和C_2H_2-N_2O-Ar直接起爆形成爆轰的临界能量  

Critical energy for direct initiation of spherical detonations in C_2H_2-O_2-Ar and C_2H_2-N_2O-Ar mixtures

作　　者：张博[1,2] 白春华[2] 

机构地区：[1]华东理工大学资源与环境工程学院,上海200237 [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：《爆炸与冲击》2012年第6期592-598,共7页Explosion and Shock Waves

基　　金：中国博士后科学基金项目(2012M520852)

摘　　要：采用高压电点火进行直接起爆形成爆轰,起爆能量通过放电过程中电流的输出信号确定。首先通过实验测定并对比C2H2-O2-Ar和C2H2-N2O-Ar等2种混合物在各种初始状态下直接起爆形成爆轰的临界起爆能量。实验结果表明,在相同状态下C2H2-N2O-Ar混合物的临界起爆能量显著高于C2H2-O2-Ar混合物的。进一步基于各物质爆炸特征长度和爆轰临界管径的参量关系对临界起爆能量差异性进行分析,得到了C2H2-N2O-Ar混合气体的爆轰临界管径预测曲线,并在此基础上得出C2H2-N2O-Ar混合物爆炸特征长度与临界管径的关系为r0=2.5dc,而C2H2-O2-Ar两者关系为r0=2dc。结果清晰地表明,使用N2O作为氧化剂,爆炸特征长度与爆轰临界管径之间的比例因数增大,表明该物质直接起爆形成爆轰所需的起爆源单位能量增大,因而直接形成爆轰的临界能量相应提高。Direct initiation was achieved via a high-voltage capacitor spark discharge and the critical energy was accurately estimated from the analysis of the current output.Experiments were carried out to measure the critical energies of C2H2-O2-Ar and C2H2-N2O-Ar mixtures under different initial conditions.The critical energies for C2H2-N2O-Ar mixtures are significantly higher than those for C2H2-O2-Ar mixtures under the same initial conditions.The relation between explosion length and critical tube diameter was analyzed to explore the large discrepancy of the critical energy between those mixtures.The critical tube diameter measurement in C2H2-N2O-Ar mixtures was further investigated,and based on the critical tube diameter correlation,the relationship between explosion length and critical tube diameter for C2H2-O2-Ar mixtures was found to be r0=2.5dc.And the corresponding relationship is r0=2dc for C2H2-O2-Ar mixtures.It displays that the proportional factor between explosion length and critical tube diameter will increase if N2O is used as an oxidizer,which results in more initiation energy per unit required for initiating the mixture to achieve a direct detonation.Thus the critical energy of direct initiation tends to be higher.

关 键 词：爆炸力学 临界起爆能量 直接起爆 C2H2-O2-Ar 爆轰 爆炸特征长度 爆轰临界管径 

分 类 号：O381[理学—流体力学]