高浓度氩气稀释对C2H2-2.5O2气体直接起爆临界能量影响的实验研究

张博; Lee John H S; 白春华

doi:10.11858/gywlxb.2012.01.008

高浓度氩气稀释对C2H2-2.5O2气体直接起爆临界能量影响的实验研究

doi: 10.11858/gywlxb.2012.01.008

1.
北京理工大学爆炸科学与技术国家重点实验室，北京 100081；
2.
Department of Mechanical Engineering, McGill University, Montreal H3A 2K6, Canada

详细信息

通讯作者:
张博 E-mail:zhangb@live.cn

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出版历程
- 收稿日期: 2010-07-13
- 修回日期: 2010-08-16
- 发布日期: 2012-02-15

Experimental Investigation of the Influence of Highly Argon Dilution on the Critical Initiation Energy for Direct Initiation of C2H2-2.5O2 Mixtures

1.
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China;
2.
Department of Mechanical Engineering, McGill University, Montreal H3A 2K6, Canada

摘要

摘要: 采用高压电点火进行直接起爆，通过放电过程中电流的输出信号确定起爆能量，实验测定了C2H2-2.5O2气体和加入摩尔浓度为70%氩气的C2H2-2.5O2混合气体直接起爆的临界起爆能量，研究了高浓度氩气稀释对C2H2-2.5O2混合物临界起爆能量的影响。实验测得的混合物临界起爆能量实验值与Lee等人的表面积能量理论值基本吻合。研究表明：C2H2-2.5O2气体和加入摩尔浓度为70%氩气的C2H2-2.5O2混合气体的临界起爆能量均依赖于初始压力，并呈反相关指数关系；在相同实验条件下，高浓度氩气稀释极大提高了混合气体直接起爆的临界起爆能量。分析认为，由于临界起爆能量正比于诱导区长度的3次方，因此在相同初始压力下，高浓度氩气的稀释增加了C2H2-2.5O2混合气体爆轰诱导区长度，并最终导致其临界起爆能量的显著上升。
- 直接起爆 /
- 临界起爆能量 /
- 诱导区长度 /
- 电火花点火 /
- 氩气
Abstract: Direct initiation is achieved via a high voltage capacitor spark discharge, and the critical energy is accurately estimated from the analysis of the current output. A good agreement is found by comparing the critical initiation energy from experimental measurement and Lee's surface energy model. The influences of highly argon dilution on the critical energy of direct initiation are investigated experimentally for C2H2-2.5O2 and 70% argon diluted C2H2-2.5O2 mixtures. The results show that the critical energy is inversely exponential to the initial pressure for C2H2-2.5O2 mixtures with and without highly argon. Both the experimental and theoretical results indicate that dilution of highly argon in C2H2-2.5O2 enhances the critical initiation energy for direct initiation at the same initial condition. Since the critical initiation energy is proportional to the cube of ZND induction zone length, the dilution of highly argon increases the ZND induction zone length of C2H2-2.5O2 mixture under the same initial pressure, and accordingly the critical initiation energy is raised remarkably.
- direct initiation /
- critical initiation energy /
- induction length /
- spark ignition /
- argon

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参考文献(19)

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