Yanfeng Jiang , Zhan Wen , Tuanwei Xu , Xianghua Chen , Peijin Liu , Wen Ao
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引用次数: 0
摘要
铝粉对固体推进剂点火的具体影响仍不清楚。因此,本研究调查了羟基封端聚丁二烯/铝/高氯酸铵复合推进剂在低温下的点火性能。基于固相反应,通过对铝进行改性,建立了推进剂点火模型,并计算了推进剂在不同初始温度下的点火延迟时间。将推进剂的初始温度从 283 K 降低到 213 K,理论点火延迟时间分别从 0.144 秒增加到 0.303 秒。通过比较激光点火得到的不同初始温度下推进剂的点火延迟时间,结果得到了证实,偏差为˂9.14%。点火延迟时间增加的主要原因是惰性加热时间的增加,而低温导致的化学反应速率的降低可以忽略不计。随后的分析表明,铝的存在大大增加了推进剂的热导率、燃烧表面的热损失和推进剂的惰性加热时间,从而显著增加了推进剂的点火延迟时间。这项研究为低温条件下的复合推进剂提供了一个实用的理论点火模型。
Ignition model for solid propellants under low temperatures involving the effect of aluminum
The specific impact of aluminum powder on solid propellant ignition remains unclear. Therefore, this study investigated the ignition performance of hydroxyl-terminated polybutadiene/aluminum/ammonium perchlorate composite propellants at low temperatures. Based on a solid-phase reaction, a propellant ignition model was developed by modifying aluminum, and the ignition delay times of the propellants at different initial temperatures were calculated. A reduced initial temperature of the propellant from 283 to 213 K increased the theoretical ignition delay time from 0.144 to 0.303 s, respectively. The results were confirmed by comparing the ignition delay times of the propellants at various initial temperatures obtained from laser ignition, with a deviation of ˂9.14%. The key reason for the increased ignition delay time was the increase in inert heating time, whereas the decrease in the chemical reaction rate due to the low temperature was negligible. Subsequent analyses revealed that the presence of aluminum significantly increased the thermal conductivity of the propellant, heat loss from the burning surface, and inert heating time of the propellant, thereby significantly increasing the ignition delay time of the propellant. This study provides a practical theoretical ignition model for composite propellants under low-temperature conditions.
期刊介绍:
The mission of the journal is to publish high quality work from experimental, theoretical, and computational investigations on the fundamentals of combustion phenomena and closely allied matters. While submissions in all pertinent areas are welcomed, past and recent focus of the journal has been on:
Development and validation of reaction kinetics, reduction of reaction mechanisms and modeling of combustion systems, including:
Conventional, alternative and surrogate fuels;
Pollutants;
Particulate and aerosol formation and abatement;
Heterogeneous processes.
Experimental, theoretical, and computational studies of laminar and turbulent combustion phenomena, including:
Premixed and non-premixed flames;
Ignition and extinction phenomena;
Flame propagation;
Flame structure;
Instabilities and swirl;
Flame spread;
Multi-phase reactants.
Advances in diagnostic and computational methods in combustion, including:
Measurement and simulation of scalar and vector properties;
Novel techniques;
State-of-the art applications.
Fundamental investigations of combustion technologies and systems, including:
Internal combustion engines;
Gas turbines;
Small- and large-scale stationary combustion and power generation;
Catalytic combustion;
Combustion synthesis;
Combustion under extreme conditions;
New concepts.