Combustion process and aluminum agglomeration characteristics of NEPE propellant
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摘要:
为了研究NEPE推进剂的燃烧过程以及铝颗粒团聚特性，通过高速相机与长焦显微镜头结合的光学拍摄方法记录推进剂的燃烧过程，使用红外热像仪记录燃烧过程中的燃烧波火焰温度，同时收集推进剂的燃烧产物，最后使用扫描电子显微镜（SEM）和激光粒度仪对燃烧产物进行了分析。结果表明，在推进剂燃烧的5个阶段：起始点火、火焰扩散、稳定燃烧、火焰衰减、火焰熄灭中均存在铝团聚物的飞溅现象。在0.5～2.0 MPa下，随着环境压强的增大，高温燃烧区域逐渐增大，燃面处铝团聚物的数量增多，但铝团聚物的粒径逐渐减小。推进剂的燃烧产物主要分为铝团聚物和氧化颗粒两类，铝团聚物粒径在50～600 μm之间，氧化铝颗粒的粒径通常不超过1 μm。
Abstract:In order to study the combustion process and aluminum agglomeration characteristics of NEPE propellant, the combustion process of NEPE propellant was recorded by the optical imaging method combined with a high-speed camera and a long distance microscope, the combustion wave flame was recorded by an infrared thermal imager, and the condensed combustion products of the propellant were collected to analyze by scanning electron microscope (SEM) and laser particle size analyzer. Results showed that the splash phenomenon of aluminum agglomerates existed in five combustion stages: initial ignition, flame diffusion, steady combustion, flame attenuation and flame extinction. At the pressure range of 0.5—2.0 MPa, with the increase of environmental pressure, the high temperature combustion region increased, the number of aluminum agglomeration at the burning surface increased, and the particle size of aluminum agglomeration gradually decreased. The condensed combustion products were mainly divided into aluminum agglomerates and oxide particles. The particle size of aluminum agglomerates was within the range of 50—600 μm, and the particle size of alumina particles usually less than 1 μm.
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图 3 1 MPa下推进剂燃烧表面铝团聚物的形成过程
Figure 3. Formation process of aluminum aggregates on propellant combustion surface at 1 MPa
图 4 不同环境压强下NEPE推进剂燃面处铝团聚对比
Figure 4. Comparison of aluminum agglomerations on the burning surface of NEPE propellant under different ambient pressures
图 6 NEPE推进剂燃烧产物粒径分布
Figure 6. Condensed combustion products size distribution of NEPE propellant
图 9 带有氧化帽结构团聚物的扫描电镜图像
Figure 9. SEM image of a agglomerate with oxidation cap structure
图 11 带有氧化帽结构团聚物的元素分布图像
Figure 11. Element distribution image of agglomerateoxidation cap structure
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