Al/NEPE推进剂燃烧特性及团聚的实验研究,Propellants, Explosives, Pyrotechnics

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Al/NEPE推进剂燃烧特性及团聚的实验研究
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2021-09-12 , DOI: 10.1002/prep.202100178
Beichen Zhang ₁ , Jinsheng Xu ₁ , Yaya Feng ₂ , Anjie Zhang ₂ , Xiong Chen ₁ , Wengxiang Cai ₁ , Li Yingkun ₁ , Min Zhu ₃

Affiliation

为了解NEPE推进剂在不同压力条件下的点火燃烧特性以及铝颗粒在燃烧表面的团聚行为，在密闭的高压激光点火平台上对Al/NEPE推进剂进行了测试。激光点火实验表明，点火延迟时间和燃烧时间均与环境压力成反比。随着压力的增加，点火延迟时间和自持燃烧时间减少。压力对点火和燃烧的影响非常复杂。然后我们使用理论机制分析压力对点火延迟时间的影响。高速显微图像显示推进剂中铝颗粒的团聚主要通过以下三个过程：积累、聚集、和聚集。还发现许多铝颗粒在表面团聚，在燃烧表面形成的铝滴团块与燃烧面分离，团块在燃烧过程中破裂并流出液态氧化铝。还观察到二次团聚现象。通过扫描电子显微镜(SEM)和能谱仪(EDS)获得NEPE推进剂中铝颗粒燃烧产物的微观结构和元素组成。检测结果证实了一些团聚现象。在3.0 MPa下，推进剂样品燃烧充分，铝颗粒为光滑球形氧化铝颗粒。1.0 MPa时，推进剂试样燃烧不充分，铝颗粒粗糙。采用激光粒度分析仪分析不同压力下的粒度。结果表明，提高压力可以降低铝颗粒的平均团聚尺寸，提高燃烧效率。3 MPa时大颗粒聚集体的数量较多。从整体粒径结果来看，在相同直径区间内，颗粒数的百分比不随压力的增加而显着增加或减少。

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Experimental Investigation on Combustion Characteristics and Agglomeration of Al/NEPE Propellants

In order to understand the ignition and combustion characteristics of NEPE propellants under different pressure conditions and the agglomeration behavior of aluminum particles on the burning surface, the Al/NEPE propellant was tested on a sealed high-pressure laser ignition platform. Laser ignition experiments show that both ignition delay time and combustion time are inversely proportional to ambient pressure. With the increase of pressure, the reduction of ignition delay time and self-sustaining combustion time is reduced. The impact of pressure on ignition and combustion is very complex. We then analyze the effect of pressure on ignition delay time using a theoretical mechanism. High-speed microscopic images display the agglomeration of aluminum particles in propellants mainly through the following three processes: accumulation, aggregation, and agglomeration. It is also found that many aluminum particles are agglomerated on the surface, the aluminum droplet agglomerates formed on the combustion surface are separated from the combustion surface, and the agglomerates rupture and flow out of the liquid alumina during the combustion process. The phenomenon of secondary agglomeration is also observed. The microstructure and elemental composition of combustion products of aluminum particles in NEPE propellant were obtained by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). The detection results confirmed some agglomeration phenomena. At 3.0 MPa, the combustion of the propellant sample is sufficient, and the aluminum particles are smooth spherical alumina particles. At 1.0 MPa, the combustion of the propellant sample is insufficient, and the aluminum particles are rough. The particle size under different pressure was analyzed by a laser particle size analyzer. The results show that increasing the pressure can reduce the average agglomeration size of aluminum particles and improve combustion efficiency. The number of large particle aggregates is more at 3 MPa. From the perspective of overall particle size results, within the same diameter interval, the percentage of particle number does not increase or decrease significantly with the increase of pressure.

更新日期：2021-09-12

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