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首页> 外文期刊>Acta astronautica >Aluminum agglomeration of AP/HTPB composite propellant
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Aluminum agglomeration of AP/HTPB composite propellant

机译：AP / HTPB复合推进剂的铝结块

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Aluminum (Al) powder agglomeration is one of the main reasons for the degradation in the performance of aluminized solid propellant rockets and so, understanding the combustion behavior of aluminum in solid propellants is of great importance. In this work, a laser ignition test bench was used to study the behavior of Al on the burning surface of an aluminum/ammonium perchlorate/hydroxyl-terminated polybutadiene composite propellant, under atmospheric pressure. Based on the images captured by a high-speed camera, the agglomeration process and behavior of the agglomerates were analyzed in detail. The size distribution and speed of motion of the agglomerates away from the burning surface were also considered. Results show that the formation of an agglomerate on the burning surface from multiple aluminum particles include three stages: accumulation, aggregation, and agglomeration. Local ignition promotes the collapse of the aggregate into a spherical agglomerate. Before detachment, the agglomerates often roll around on the burning surface and pick up more aluminum, promoting self-growth. The interesting phenomenon of an agglomerate droplet rupturing and ejecting liquid alumina on the burning surface was clearly captured for the first time. This is believed to indicate the heterogeneous composition characteristics of the agglomerate. The transformation of the polar oxide cap on one part of the agglomerate surface into an alumina shell that fully covers the droplet surface was also captured for the first time. The agglomerates have different shapes, diameters, and velocities when they leave the burning surface. The formation of non-spherical agglomerates consisting of more than one aluminum droplet is ascribed to the propellant microstructure. The 400 agglomerates that were counted had diameters that ranged from 51 mu m to 815 mu m and the majority of them (nearly 98%) were below 400 mu m. The velocities of motion of 176 agglomerates exhibited great dispersion, with the maximum and minimum velocity being 196 cm/s and 13 cm/s, respectively. In general, the moving velocities of the agglomerates decreased with increasing diameter.
机译：铝（Al）的团聚是导致铝化固体推进剂火箭性能下降的主要原因之一，因此，了解铝在固体推进剂中的燃烧行为非常重要。在这项工作中，使用激光点火试验台研究大气压下铝在高铝酸铝/高氯酸铵/羟基封端的聚丁二烯复合推进剂燃烧表面上的行为。基于高速相机捕获的图像，详细分析了团聚的过程和行为。还考虑了附聚物离开燃烧表面的尺寸分布和运动速度。结果表明，由多个铝颗粒在燃烧表面形成附聚物的过程包括三个阶段：聚集，聚集和附聚。局部点火促进聚集体崩解成球形附聚物。在分离之前，附聚物经常在燃烧的表面上滚动并吸收更多的铝，从而促进自身生长。第一次清楚地看到了有趣的现象，即凝聚液滴破裂并在燃烧表面喷出液态氧化铝。据信这表明了附聚物的异质组成特征。第一次也将聚集体表面的一部分上的极性氧化物盖转变为完全覆盖液滴表面的氧化铝壳。当附聚物离开燃烧表面时，它们具有不同的形状，直径和速度。由多于一个的铝液滴组成的非球形附聚物的形成归因于推进剂的微观结构。所计数的400个附聚物的直径范围为51微米至815微米，其中大多数（近98％）低于400微米。 176个附聚物的运动速度表现出很大的分散性，最大和最小速度分别为196 cm / s和13 cm / s。通常，附聚物的移动速度随着直径的增加而降低。

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