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首页> 外文期刊>Combustion and Flame >The effect of polymeric binder on composite propellant flame structure investigated with 5 kHz OH PLIF
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The effect of polymeric binder on composite propellant flame structure investigated with 5 kHz OH PLIF

机译：用5 kHz OH PLIF研究聚合物粘结剂对复合推进剂火焰结构的影响

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摘要

High speed (5 kHz) planar laser-induced fluorescence (PLIF) and high resolution imaging are used to probe the flame structure and to image coarse ammonium perchlorate (AP) particles on the surface of deflagrating bimodal composite propellants formulated with various binders. Three binder systems are examined: hydroxyl-terminated polybutadiene (HTPB), polybutadiene acrylonitrile (PBAN) and dicyclo-pentadiene (DCPD). A comparison of coarse AP particle behavior and flame structure is presented for each propellant over a pressure range of 1 -6.4 atm. Individual AP particle ignition delay, burn time, and flame heights are quantified. Both jet-like diffusion flames and lifted, overventilated flames were observed for the propellants examined. The average diffusion flame height is observed to increase gradually over the pressure range studied. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) was also performed on the AP/binder systems. It was found that both AP/HTPB and AP/PBAN react together exothermically while AP/DPCD reacts independently, with a quick binder pyrolysis proceeding AP decomposition. Propellants formulated with HTPB, PBAN, and DCPD were found to possess a similar diffusion flame structure, but those with DCPD were measured to have a significantly higher burning rate. Propellants formulated with DCPD were observed to routinely eject coarse AP crystals from the burning surface, which results in the higher burning rate. Based on experimental observations, it is argued that either fast binder pyrolysis or poor adhesion to coarse AP particles is the mechanism responsible for the particle ejection.
机译：高速（5 kHz）平面激光诱导荧光（PLIF）和高分辨率成像用于探测火焰结构，并对由各种粘合剂配制的爆燃双峰复合推进剂表面上的粗高氯酸铵（AP）颗粒成像。检查了三种粘合剂体系：羟基封端的聚丁二烯（HTPB），聚丁二烯丙烯腈（PBAN）和二环戊二烯（DCPD）。给出了在1 -6.4 atm的压力范围内每种推进剂的粗颗粒AP颗粒行为和火焰结构的比较。量化了各个AP粒子的点火延迟，燃烧时间和火焰高度。对于所检查的推进剂，都观察到了喷射状的扩散火焰和过度通风的火焰。观察到平均扩散火焰高度在所研究的压力范围内逐渐增加。还对AP /粘合剂系统进行了差示扫描量热法（DSC）和热重分析（TGA）。发现AP / HTPB和AP / PBAN都放热反应，而AP / DPCD独立地反应，快速的粘合剂热解使AP分解。发现用HTPB，PBAN和DCPD配制的推进剂具有相似的扩散火焰结构，但测得具有DCPD的推进剂具有明显更高的燃烧速率。观察到用DCPD配制的推进剂通常会从燃烧表面喷射出粗大的AP晶体，从而提高了燃烧速度。基于实验观察，有人认为，快速的粘合剂热解或对粗糙的AP颗粒的粘附性差是造成颗粒喷射的机制。

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