绝热指数γ对平面爆轰过程中不同复合波区的参数特性影响分析  

Influences of adiabatic indexγon the parameters of different complex wave zones in a planar detonation

作　　者：张娅 李晓彬[1] 彭帅 施锐 ZHANG Ya;LI Xiaobin;PENG Shuai;SHI Rui(School of Transportation,Wuhan University of Technology,Wuhan 430063,Hubei,China;Systems Engineering Research Institute,Beijing 100036,China)

机构地区：[1]武汉理工大学交通学院,湖北武汉430063 [2]中国船舶工业系统工程研究院,北京100036

出　　处：《爆炸与冲击》2021年第10期51-63,共13页Explosion and Shock Waves

基　　金：国家自然科学基金(51979213)。

摘　　要：爆炸气体产物冲击膨胀过程中会形成多种复合波区,当爆炸气体绝热指数γ不同时其波区衰减特性差异较大。为研究不同γ条件下(γ>3,γ=3,γ<3)复合波区的特性差异,基于特征线法,对一平面爆轰过程中不同复合波区的波系相交特性进行了规律分析,并利用MATLAB对该平面爆轰过程进行流场模拟,验证并分析了不同复合波区流场内的参数变化特性。对比发现,γ不同时复合波区衰减特性的差异主要体现在与质点速度和气体声速相关的u-c平面特性上,其中在两中心稀疏波相交的复合波区,其差异还体现当γ≠3时相交的中心稀疏波不再具有中心发散特性。对爆炸过程中各波区特性的分析可为全面了解各特征参数的衰减规律提供参考。A variety of complex wave zones are formed during the impact and expansion of explosive gas products.When the adiabatic indexγof explosive gas is different,the attenuation characteristics of the wave zones are quite different.In order to understand the characteristics of the complex wave zone under the differentγconditions(γ>3,γ=3,γ<3),the intersection characteristics of different complex wave zones in a planar detonation were analyzed based on the characteristic line method.The flow field in the planar detonation was simulated by MATLAB to verify and analyze the parameter change characteristics of the flow fields in the different complex wave zones.Comparisons display that the differences in the attenuation characteristics of the wave zones are mainly reflected in the differences in the u-c plane characteristics related to the particle velocity and the gas sound velocity.Among them,in the complex wave zone where two rarefaction waves intersect,the difference is also reflected in that whenγ≠3,the rarefaction wave no longer has the characteristic of central divergence.The analysis result on the characteristics of each wave zone in the explosion process provides a reference for comprehensively understanding the attenuation of each characteristic parameter.

关 键 词：复合波区 特征线法 绝热指数 稀疏波 u-c特性 

分 类 号：O381[理学—流体力学]