Study on Diagnostics of Nano Boron-Based Composite Metal Particles in Dispersion Combustion
YU Run-tian1, MA Man-man1, QIN Zhao2*, LIU Guan-nan1, ZHANG Rui1, LIU Dong1*
1. School of Energy and Power Engineering, Nanjin University of Science and Technology, Nanjing 210094, China
2. Science and Technology on Combustion and Explosion Laboratory, Xi'an Modern Chemistry Research Institute, Xi'an 710065, China
Abstract:Adding metal fuel can improve the energy density of the propellant and alleviate the instability phenomenon of high frequency combustion of the ramjet. Boron has been of considerable interest as fuel for propellants and explosives due to its high gravimetric and volumetric calorific values. However, its combustion is inhibited by the high melting point, the high boiling point and the oxide layer that covers the particles. Aluminum and iron have high combustion heat, fast energy release rate and high theoretical combustion heat utilization. Aluminum and iron are introduced to improve boron's combustion efficiency and actual combustion heat value. Aluminum and iron increases the exothermic heat of surface reaction and promotes the ignition and combustion of boron. Boron is mixed with aluminum and iron to make composite metal fuel to solve the problems of difficult ignition and poor combustion performance. Solid fuel with great ignition performance and high energy density can be obtained. The effects of ignition and combustion characteristics of boron-based composite fuel were explored using a dispersion combustion system. The ignition phenomenon of boron-based composite metal fuel was recorded by the high-speed camera, and the temperature distribution was calculated by using the two-color pyrometry method. The combustion mechanism of boron-based composite metal fuel was analyzed using characterization methods. The results showed that adding aluminum and iron reduced the ignition delay time and combustion time. The number of boron particles ignited increased at the same time.The combustion process of boron was intense. The addition of nano-aluminum increased the combustion temperature, while the addition of nano-iron decreased the combustion temperature. The obvious green light was observed during the temperature measurement of boron-based composite metal particles in dispersion combustion.The emission spectrum showed that the green light come from the intermediate product BO2 generated by boron combustion. After dispersion combustion, the agglomerates of boron-based composite metal particles were mainly oxidation products, which also contained a small amount of nitrogen. The product agglomeration phenomenon of the boron-based composite metal particles after dispersion combustion was obvious, and the fracture of the irregular block boron was aggravated. After the boron-based composite metal particles entered the drop tube furnace, the temperature of the additive nanoparticles rose rapidly in a short time by thermal radiation. The aluminum and iron particles started to burn and release heat energy. The heat released by combustion accumulates inside the particles. Then the heat was absorbed by the boron particles, which broke the oxide layer on the boron surface. The internal boron contacted the air. The temperature continued to the ignition point of boron.The mixed metal started to burn and release heat energy. The heat was absorbed by the boron particles, which promoted the combustion of boron.
于润田,马曼曼,秦 钊,刘冠楠,张 睿,刘 冬. 纳米硼基复合金属颗粒弥散燃烧的诊断研究[J]. 光谱学与光谱分析, 2023, 43(10): 3252-3259.
YU Run-tian, MA Man-man, QIN Zhao, LIU Guan-nan, ZHANG Rui, LIU Dong. Study on Diagnostics of Nano Boron-Based Composite Metal Particles in Dispersion Combustion. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(10): 3252-3259.
[1] SHANG Zhong-quan, WANG Rui-xin(汤中权,王锐鑫). Chemical Propellants and Polymeric Materials(化学推进剂与高分子材料), 1998, (3): 40.
[2] Ao W, Wang Y, Li H P, et al. Propellants, Explosives, Pyrotechnics, 2014, 39(2): 185.
[3] Chintersingh K L, Nguyen Q, Schoenitz M, et al. Combustion and Flame, 2016, 172: 194.
[4] Ulas A, Kuo K K, Gotzmer C. Combustion and Flame, 2001, 127(1): 1935.
[5] Trunov M A, Hoffmann V K, Schoenitz M, et al. Journal of Propulsion and Power, 2008, 24(2): 184.
[6] Karmakar S, Wang N, Acharya S, et al. Combustion and Flame, 2013, 160(12): 3004.
[7] Liang D L, Liu J Z, Li H P, et al. Journal of Thermal Analysis and Calorimetry, 2017, 128(3): 1771.
[8] Korotkikh A, Slyusarskiy K, Monogarov K, et al. MATEC Web of Conferences, 2017, 110: 01042.
[9] LI Chao, ZHANG Li-feng, WU Guan-jie, et al(李 超,张力锋,武冠杰,等). Journal of Solid Rocket Technology(固体火箭技术), 2018, 41(5): 537.
[10] Li C, Hu C B, Deng Z, et al. Aerospace Science and Technology, 2021, 110: 106478.
[11] Chintersingh K L, Schoenitz M, Dreizin E L. Combustion and Flame, 2018, 192: 44.
[12] Guo Y, Zhou X, Zhang W, et al. Combustion and Flame, 2019, 203: 230.
[13] Liu H F, Zheng Z L, Yao M F, et al. Applied Thermal Engineering, 2012, 33: 135.
[14] Huang X F, Yang Y H, Hou F T, et al. Propellants, Explosives, Pyrotechnics, 2020, 45(10): 1645.
[15] Liu G N, Liu D, Zhu J W, et al. Energy, 2018, 144: 669.
[16] HU Zong-jie, ZHANG Jun-jie, GAO Yu, et al(胡宗杰,张骏捷,高 宇,等). Journal of Engineering Thermophysics(工程热物理学报), 2020, 41(7): 1808.
[17] Cui Y Q, Liu H F, Wen M S, et al. Fuel, 2022, 312: 122949.
[18] Spalding M J, Krier H, Burton R L. Combustion and Flame, 2000, 120(1): 200.
[19] LI Hui-zhi, ZHAI Dian-tang, XU Chong-juan, et al(李慧芝,翟殿棠,许崇娟,等). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2007, 27(6): 1204.
[20] AO Wen, WANG Yang, LI He-ping, et al(敖 文,汪 洋,李和平,等). Journal of Propulsion Technology(推进技术), 2014, 35(5): 648.
[21] Liang D L, Xiao R, Liu J Z, et al. Aerospace Science and Technology, 2019, 84: 1081.