The role of HMX particle size in the combustion and agglomeration of HTPB-based propellant

Dongliang Gou; Zhimin Fan; Shixi WuPeijin LiuGuoqiang HeWen Ao

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The role of HMX particle size in the combustion and agglomeration of HTPB-based propellant

机译：The role of HMX particle size in the combustion and agglomeration of HTPB-based propellant

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Cyclotetramethylene tetranitramine (HMX) is usually added to solid propellants, but the inclusion of HMX significantly affects the propellant combustion characteristics, especially by yielding more condensed combustion products (CCPs). The effect of HMX size on aluminum agglomeration and CCPs of hydroxyl-terminated polybutadiene (HTPB)-based propellant is evaluated experimentally in this paper. Using a thermogravimetry-differential scanning calorimeter, laser ignition setup, and high-pressure combustion bomb, we have examined the propellants' thermal reactivity, ignition behavior, combustion characteristics, agglomeration, and CCPs with 10-200 urn virgin HMX particles. The results indicate that HMX in propellant suppresses the pyrolysis reaction of ammonium perchlorate. Meanwhile, the exothermic peak temperature of 200 urn HMX increases by 17.8℃ compared to 10 urn HMX. With the increase of HMX size from 10 μm to 200 μm, the combustion intensity of the propellant increases, and the ignition delay time of aluminum particles decreases from 580.6 ms to 498.3 ms. Increasing HMX size leads to an increased burning rate, while the pressure exponent decreases from 0.34 to 0.23. Including HMX in propellants also promotes aluminum agglomeration during propellant combustion. With HMX size expanding from 10 μm to 200 μm, the mean agglomerate size in the CCPs decreases from 221.9 μm to 124.5 μm, and the fraction of aluminum involved in agglomeration decreases from 0.206 to 0.104. The unbumed aluminum content in agglomerated particles increases monotonically with increasing agglomerates size. Overall, HMX size has a significant impact on the ignition, combustion, and agglomeration characteristics of aluminized propellant. The conclusions of the paper can be used as a guidance for optimizing the propellant formulation.

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来源
《Aerospace science and technology》 |2023年第5期|108170.1-108170.9|共9页
作者
Dongliang Gou; Zhimin Fan; Shixi WuPeijin LiuGuoqiang HeWen Ao;
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作者单位

Science and Technology on Combustion, Internal Flow and Thermo-structure Laboratory, Northwestern Polytechnical University, Xi'an, 710072, China;

Hubei Institute of Aerospace Chemical Technology, Xiangyang 441003, China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
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Cyclotetramethylene tetranitramine (HMX); Solid propellants; Condensed combustion products; Agglomeration; Solid rocket motor;

The role of HMX particle size in the combustion and agglomeration of HTPB-based propellant

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