基于流动与化学反应耦合的镁/聚四氟乙烯烟火剂二维燃烧模型及数值计算

doi:10.3969/j.issn.1000-1093.2016.02.014

兵工学报 ›› 2016, Vol. 37 ›› Issue (2): 287-292.doi: 10.3969/j.issn.1000-1093.2016.02.014

基于流动与化学反应耦合的镁/聚四氟乙烯烟火剂二维燃烧模型及数值计算

林长津¹，王浩¹，朱晨光²

(1.南京理工大学能源与动力工程学院，江苏南京 210094；2.南京理工大学化工学院，江苏南京 210094)

收稿日期:2015-04-22 修回日期:2015-04-22 上线日期:2016-04-22
通讯作者: 林长津 E-mail:lin_changjin2014@yahoo.com
作者简介:林长津(1989—)，男，博士研究生
基金资助:
国家自然科学基金项目(51076066)

2D Combustion Model and Numerical Simulation of Mg-Teflon Pyrolant Based on Flow-chemistry Coupling

LIN Chang-jin¹， WANG Hao¹， ZHU Chen-guang²

(1.School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China;2School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China)

Received:2015-04-22 Revised:2015-04-22 Online:2016-04-22
Contact: LIN Chang-jin E-mail:lin_changjin2014@yahoo.com

摘要/Abstract

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+M2CF₂+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MgF的比例减少。

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

Abstract: 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 20mm, 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 MgF reduces with the increase in mixing ratio.

Key words: ordnance science and technology, Mg-Teflon pyrolant, turbulence combustion, coupling, numerical simulation

中图分类号:

TJ530.2

林长津，王浩，朱晨光. 基于流动与化学反应耦合的镁/聚四氟乙烯烟火剂二维燃烧模型及数值计算[J]. 兵工学报, 2016, 37(2): 287-292.

LIN Chang-jin， WANG Hao， ZHU Chen-guang. 2D Combustion Model and Numerical Simulation of Mg-Teflon Pyrolant Based on Flow-chemistry Coupling[J]. Acta Armamentarii, 2016, 37(2): 287-292.

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基于流动与化学反应耦合的镁/聚四氟乙烯烟火剂二维燃烧模型及数值计算

2D Combustion Model and Numerical Simulation of Mg-Teflon Pyrolant Based on Flow-chemistry Coupling

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