摘要
针对镁/聚四氟乙烯(MT)烟火剂燃烧过程中湍流对燃烧的影响关系,建立流动与化学反应相耦合的二维计算流体力学模型,模拟不同质量比MT烟火剂稳态燃烧过程,获得了燃烧场温度、组分分布特性,并将计算结果与文献[10,16,18]值进行对比。对比结果表明:燃烧场温度上升段大约20 mm,这与文献[10]实验值吻合较好,且温升段距离与反应机理C2F4+M2CF2+M区域位置相对应;当量质量比为33/67的MT火焰温度最高,与热力计算结果相一致,随着质量比的增加,存在不完全反应;燃料Mg的消耗主要通过与CF2的氧化反应,Mg与F的反应过程不能忽略,且随着质量比的增大,燃烧产物Mg F的比例减少。
A two-dimensional computational fluid dynamics（ CFD） model for flow-chemistry coupling is established to analyze the influence of turbulence on the combustion of Mg-teflon（ MT） pyrolant. The steady combustion of MT pyrolants with different mixing ratios was simulated,and the combustion temperature and composition distribution characteristics were obtained. The calculated results are compared with the values in Refs. [10,16,18]. The compared results show that the rising step of temperature in the combustion field is about 20 mm,which agrees well with the experimental data in Ref. [10]. The distance of temperature rising step is corresponding to the reaction region of C2F4＋ M ←→2CF2＋ M. The highest temperature of MT pyrolant with equivalent mixing ratio（ 33 /67） is consistent with the thermodynamic calculated result. With the increase in mixing ratio,the incomplete reaction happens. Mg is mainly consumed through its oxidizing reaction with CF2. The reaction of Mg with F cannot be neglected. The percentage of combustion product Mg F reduces with the increase in mixing ratio.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2016年第2期287-292,共6页
Acta Armamentarii
基金
国家自然科学基金项目(51076066)
关键词
兵器科学与技术
镁/聚四氟乙烯烟火剂
湍流燃烧
耦合
数值模拟
ordnance science and technology
Mg-Teflon pyrolant
turbulence combustion
coupling
numerical simulation
