不同氧含量气氛下AlH_3激光点火燃烧特性研究
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摘要
三氢化铝(AlH_3)作为一种新型含能材料,可显著提升固体推进剂的比冲,具有广阔的发展前景。为了填补国内对AlH_3基础研究的空白,利用激光点火实验台对不同氧含量气氛下的AlH_3进行点火燃烧实验,采用光纤光谱仪、高速相机、双色高温计监测样品点火燃烧过程中的火焰形貌、温度变化、光谱数据等,并对燃烧残留物进行理化特性分析。结果显示,AlH_3在燃烧过程中存在火焰脱离样品的现象。且随着气氛中氧含量的提高,燃烧强度增大,最高温度呈现增大的趋势,由1025.5℃增加到1350.0℃,点火延迟时间缩短,由22ms下降至4ms,燃烧时间呈现先延长后缩短的趋势。高氧含量气氛下与低氧含量气氛下的燃烧残留物形态和成分有很大不同。反应气氛中氧含量的提高可以有效促进AlH_3的点火燃烧性能。
As a new type of energetic material,aluminum hydride can significantly increase the specific im-pulse of solid propellants and has a broad development prospect. In order to fill the gap in the domestic researchon aluminum hydride,the ignition and combustion experiment of aluminum hydride under different oxygen con-tent atmospheres was carried out by using a laser ignition experimental bench. A fiber optic spectrometer,a high-speed camera and a two-color pyrometer were used to monitor the flame morphology,temperature changes andspectral data of the sample during ignition and combustion. Physical and chemical properties of combustion resi-dues were analyzed. The results show that there is a phenomenon that the flame escapes from the sample duringcombustion. As the oxygen content in the atmosphere increases,the combustion strength increases,the maximumtemperature increases from 1025.5℃ to 1350.0℃,the ignition delay time decreases from 22 ms to 4 ms,and theburning time first increases and then decreases. The morphology and composition of combustion residues in a high oxygen content atmosphere are very different from those in a low oxygen content atmosphere. The increase of oxy-gen content in the atmosphere can effectively promote the ignition and combustion of aluminum hydride.
As a new type of energetic material,aluminum hydride can significantly increase the specific im-pulse of solid propellants and has a broad development prospect. In order to fill the gap in the domestic researchon aluminum hydride,the ignition and combustion experiment of aluminum hydride under different oxygen con-tent atmospheres was carried out by using a laser ignition experimental bench. A fiber optic spectrometer,a high-speed camera and a two-color pyrometer were used to monitor the flame morphology,temperature changes andspectral data of the sample during ignition and combustion. Physical and chemical properties of combustion resi-dues were analyzed. The results show that there is a phenomenon that the flame escapes from the sample duringcombustion. As the oxygen content in the atmosphere increases,the combustion strength increases,the maximumtemperature increases from 1025.5℃ to 1350.0℃,the ignition delay time decreases from 22 ms to 4 ms,and theburning time first increases and then decreases. The morphology and composition of combustion residues in a high oxygen content atmosphere are very different from those in a low oxygen content atmosphere. The increase of oxy-gen content in the atmosphere can effectively promote the ignition and combustion of aluminum hydride.
引文
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[2]刘晶如,辛伟,杨寅.含金属氢化物推进剂的能量特性计算研究[J].火工品,2010,(2):37-40.
[3]陈晓丽,唐安江,韦德举,等. AlH3的合成工艺研究[J].广东化工,2014,41(16):92-93.
[4] Graetz J,Reilly J J,Kulleck J G,et al. Kinetics and Thermodynamics of the Aluminum Hydride Polymorphs[J]. Journal of Alloys and Compounds,2007,446:271-275.
[5] Graetz J,Reilly J J. Thermodynamics of the Alpha,Beta and Gamma Polymorphs of AlH3[J]. Journal of Alloys and Compounds,2006,424(1-2):262-265.
[6] Graetz J,Reilly J J. Decomposition Kinetics of the AlH3Polymorphs[J]. Journal of Physical Chemistry B,2005,109(47):22181-22185.
[7] Sandrock G,Reilly J J,Graetz J,et al. Accelerated Thermal Decomposition of AlH3for Hydrogen-Fueled Vehicles[J]. Applied Physics A:Materials Science and Processing,2005,80(4):687-690.
[8]张斌,毛根旺,王赫,等. AlH3的最新研究进展[J].金属功能材料,2009,16(6):71-75.
[9] Bazyn T,Eyer R,Krier H,et al. Combustion Characteristics of Aluminum Hydride at Elevated Pressure and Temperature[J]. Journal of Propulsion and Power,2004,20(3):427-431.
[10] Young G,Piekiel N,Chowdhury S,et al. Ignition Behavior ofα-AlH3[J]. Combustion Science and Technology,2010,182(9):1341-1359.
[11] Tang C J,Lee Y J,Kudva G,et al. A Study of the GasPhase Chemical Structure During CO2Laser Assisted Combustion of HMX[J]. Combustion and Flame,1999,117(1-2):170-188.
[12]郝海霞,裴庆,赵凤起,等.固体推进剂激光点火性能研究综述[J].含能材料,2009,17(4):491-498.
[13]陈冰虹,刘建忠,梁导伦,等.氧化剂包覆硼颗粒对硼基推进剂点火燃烧特性的影响[J].含能材料,2016,24(8):774-780.
[14] Zhou Y,Liu J,Liang D,et al. Effect of Particle Size and Oxygen Content on Ignition and Combustion of Aluminum Particles[J]. Chinese Journal of Aeronautics,2017,30(6):1835-1843.
[15]朱小良,方可人.热工测量及仪表[M].北京:中国电力出版社,2011.