压强对纳米铝粉点火和燃烧特性的影响  

Effect of pressure on ignition and combustion characteristics of nano-aluminum powder

作　　者：冯超杰 金枭 许敦辉 李盛姬[2] 黄雪峰 刘建忠[3] FENG Chaojie;JIN Xiao;XU Dunhui;LI Shengji;HUANG Xuefeng;LIU Jianzhong(Department of Physics,School of Sciences,Hangzhou Dianzi University,Hangzhou 310018,China;Materials and Environmental Engineering,Hangzhou Dianzi University,Hangzhou 310018,China;State Key Laboratory for Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]杭州电子科技大学理学院物理系,杭州310018 [2]杭州电子科技大学材料与环境工程学院,杭州310018 [3]浙江大学能源清洁利用国家重点实验室,杭州310027

出　　处：《固体火箭技术》2024年第5期653-659,共7页Journal of Solid Rocket Technology

摘　　要：为了揭示压强对纳米铝(n-Al)粉点火和燃烧特性的影响,利用高压燃烧实验台对n-Al粉堆进行了0.1~3.5 MPa的激光点火实验研究。采用高速摄像仪、三色测温仪和光谱分析仪同步获取颗粒堆着火、火焰演变、表面辐射温度和特征辐射光谱等信息,分析了n-Al粉堆点火和燃烧特性。结果表明,空气气氛中的n-Al粉堆在1.5 MPa时,燃烧时间最短且最充分,剧烈燃烧阶段占比最大。随着压强的增加,n-Al粉的燃烧火焰强度和特征辐射光谱均增强,三个燃烧阶段时间从常压下的254.03、864.24、922.69 ms分别缩短至1.0 MPa时的118.85、435.69、452.50 ms,总燃烧时间缩短了50.65%。点火延迟时间和燃烧时间均随压强增加呈现非线性曲线的变化趋势,在0.1~1.5 MPa范围内,提高空气压强可以减小n-Al粉的燃烧时间,增大火焰锋面,提升最高燃烧火焰温度,促进气相燃烧。但过高的压强(1.5~2.5 MPa)会阻碍n-Al粉点火及火焰发展,减小剧烈燃烧阶段占比进而增大燃烧时间,引起中压熄火现象。In order to reveal the effect of pressure on the ignition and combustion characteristics of nano-aluminum(n-Al),laser-induced ignition experiments in the pressure range of 0.1~3.5 MPa were conducted by using a high-pressure combustion test platform.The ignition,flame evolution,highest surface temperature and characteristic peak diffraction spectrum of n-Al powder stack were obtained with a high-speed camera,a three-color pyrometer and a grating spectrograph,then the ignition and combustion characteristics were analyzed.The results show that the n-Al powder stack at 1.5 MPa air atmosphere has the shortest combustion time and fully burns,with the largest percentage of violent combustion stage.With the increase of pressure,the combustion flame intensity and characteristic radiation spectra of n-Al powder are enhanced,and the time of three combustion stages are shortened from 254.03 ms,864.24 ms,and 922.69 ms at atmospheric pressure to 118.85 ms,435.69 ms,and 452.50 ms at 1.0 MPa,respectively,which make the total combustion time reduced by 50.65%.Both ignition delay time and combustion time show a nonlinear trend with the increase of pressure,and in the range of 0.1~1.5 MPa,the increase of pressure could reduce the combustion time of n-Al powder,enlarge the flame front,enhance the maximum combustion flame temperature,and promote the gas-phase combustion.However,higher pressure(1.5~2.5 MPa)will hinder the ignition and flame development of n-Al powder,reduce the proportion of violent combustion stage,increase the combustion time,and lead to medium-pressure flameout.

关 键 词：纳米铝粉 压强效应 点火 燃烧 光学诊断 

分 类 号：V512[航空宇航科学与技术—航空宇航推进理论与工程]