The mechanism of combustion of superfine aluminum powders

Kwon, Young-Soon; Gromov, A. A.; Ilyin, Alexander P.; Popenko, E. M.; Rim, Geun-Hie

doi:10.1016/s0010-2180(03)00024-5

Cited by 134 publications

(55 citation statements)

References 21 publications

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“…Burning rates herein are obtained experimentally by burning small propellant strands and measuring the surface regression versus time. Literature on combustion of metal particles indicates that ignition could probably take place via two potential pathways [17][18][19][20][21]. One is the destruction of the metal oxide layer due to cracking, and the other is self-heating due to oxidizer diffusion through the oxide layer, and hence melting of the layer.…”

Section: Burning Rate and Pressure Exponentmentioning

confidence: 99%

“…Although so many achievements in the experimental study of metalized fuels systems have been made [19][20][21][22][23], with renewed interest in energetic metals, many fundamental issues concerning the effects that the actual particle size has on the ignition and combustion characteristics, when used as components of solid rocket propellants, remain to be clarifi ed. In addition, only few data are available on the effects of metal particle and grain size on the combustion features of propellants, specifi cally mechanical sensitivity, and burning rate characteristics of the fuel rich solid propellants containing different aluminum particles sizes.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Nano-Sized Al on the Combustion Performance of Fuel Rich Solid Rocket Propellants

Pang¹,

Zhao²,

DeLuca

et al. 2016

Eur Chem Tech J

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Several industrial-and research -type fuel rich solid rocket propellants containing nano-metric aluminum metal particles, featuring the same nominal composition, were prepared and experimentally analyzed. The effects of nano-sized aluminum (nAl) on the rheological properties of metal/HTPB slurries and fuel rich solid propellant slurries were investigated. The energetic properties (heat of combustion and density) and the hazardous properties (impact sensitivity and friction sensitivity) of propellants prepared were analyzed and the properties mentioned above compared to those of a conventional aluminized (micro-Al, mAl) propellant. The strand burning rate and the associated combustion fl ame structure of propellants were also determined. The results show that nAl powder is nearly "round" or "ellipse" shaped, which is different from the tested micrometric Al used as a reference metal fuel. Two kinds of Al (nAl and mAl) powder can be dispersed in HTPB binder suffi ciently. The density of propellant decreases with increasing mass fraction of nAl powder; the measured heat of combustion, friction sensitivity, and impact sensitivity of propellants increase with increasing mass fraction of nAl powder in the formulation. The burning rates of fuel rich propellant increase with increasing pressure, and the burning rate of the propellant loaded with 20% mass fraction of nAl powder increases 77.2% at 1 MPa, the pressure exponent of propellant increase a little with increasing mass fraction of nAl powder in the explored pressure ranges.

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Section: Burning Rate and Pressure Exponentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Nano-Sized Al on the Combustion Performance of Fuel Rich Solid Rocket Propellants

Pang¹,

Zhao²,

DeLuca

et al. 2016

Eur Chem Tech J

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“…분진입경이 1 μm이상의 마이크로 크기의 Al 분 진의 폭발특성에 대한 조사는 많이 알려지고 있는 데, 예를 들면 Al 분진의 발화위험성에 미치는 산소 량의 영향 [4], Al 분진의 발화과정특성 [5], 공기중 분 무상태의 Al 미세 분진의 연소특성 [6], Al 분진의 발 화온도특성 [7], Al의 연소메커니즘 [8] 등과 같이 많 은 연구자들에 의해 연구되어 왔다. 반면에 나노 크 기의 Al 분진에 대한 연구로서는 저온에서의 발화 특성 [9][10] …”

Section: 나노 및 마이크로 입자 알루미늄의 폭발 특성unclassified

Explosion Properties of Nano and Micro-sized Aluminium Particles

Han¹,

Lee²

2014

Journal of the Korean Institute of Gas

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-Explosion characteristics of micro-sized aluminum dusts had been studied by many researchers, but the research of nano-sized aluminum dusts were very insufficient. In this study, an experimental investigation was carried out on the influences of nano and micro-sized aluminum dusts (70 nm, 100 nm, 6 μ m, 15 μm) on dust explosion properties of aluminum particles by using 20 L explosion apparatus. With decreasing of particle size in suspended aluminum dusts, the LEC (lower explosion concentration) of nano-sized aluminum is lower than that of micro-sized aluminum. The particle size change of nano-sized aluminum dusts seems no obvious explosion differences than that of micro-sized aluminum dusts. From the observation of nano-sized aluminum particles by TEM (Transmission Electron Microscopy), it is estimated that increase of particles aggregation may have effects on the explosion characteristics of aluminum nanopowders.

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“…Fine powders are widely employed in several areas including, for instance, the chemical, energy, pharmaceutical, cosmetic and food industries. Fine aluminum powder (<10 µm) is used as an additive in energetic materials and as a fuel for various applications, due to its high calorific value [1][2][3][4]. Such powders, however, have very high tendency to agglomerate before and during combustion due to the presence of high surface forces, and they show poor flowability due to cohesion forces arising mainly as a result of van der Waals forces [5] that dominate over gravitational forces [6].…”

Section: Introductionmentioning

confidence: 99%