Propellant Combustion Wave Studies by Embedded Thermocouple and Imaging Method at Ambient Pressure

ABSTRACT: This paper discusses the method for propellant combustion studies with embedded thermocouple and imaging method at ambient pressure. In this study, three different propellant compositions are experimentally evaluated for surface temperature, flame zone temperature with embedded thermocouple, and reaction zone thickness with high-speed imaging of propellant during combustion at ambient pressure. Preheat zone and flame zone temperature profiles are recorded with time and surface temperature is determined with available models. Observation of these experiments gives the difference between combustion mechanism of double-base propellant with diethylene glycol dinitrate (DEGDN) and 2,4-dinitrotoluene (DNT), composite propellant (CP) and CP with energetic binder. Scanning electron microscope (SEM) images analysis for pristine and quenched sample is also presented.摘要：本文探讨了常压环境下采用嵌入式热电偶与成像方法开展推进剂燃烧研究的相关技术路径。本研究针对三种不同推进剂配方，通过嵌入式热电偶测量其燃烧过程中的表面温度与火焰区温度，并借助高速成像技术记录反应区厚度，完成了系列实验评估。研究同步记录了预热区与火焰区的时域温度分布，并依托现有模型计算得到推进剂表面温度。通过对实验现象的观测，明确了添加二乙二醇二硝酸酯（diethylene glycol dinitrate, DEGDN）与2,4-二硝基甲苯（2,4-dinitrotoluene, DNT）的双基推进剂，以及复合推进剂（composite propellant, CP）与含能粘结剂复合推进剂的燃烧机理差异。此外，本文还对原始试样与淬火试样的扫描电子显微镜（Scanning Electron Microscope, SEM）成像结果开展了分析。