螺旋爆轰内部胞格结构实验探索  

Experimental Research on Spinning Detonation Structure

作　　者：严屹然 张英华[1,2] 赵焕娟[1,2] 秦玄烨 牛淑贞 董士铭 YAN Yi-ran;ZHANG Ying-hua;ZHAO Huan-juan;QIN Xuan-ye;NIU Shu-zhen;DONG Shi-ming(School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;State Key Laboratory of Ministry of Education of High-Efficient Mining and Safety of Metal Mines,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学土木与资源工程学院,北京100083 [2]北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083

出　　处：《推进技术》2021年第3期593-600,共8页Journal of Propulsion Technology

基　　金：国家自然科学基金青年基金(11602017);中央高校基本科研业务费专项资金(FRF-GF-18-001B,FRF-TP-18-027A2);国家留学基金(CSC201806460039)。

摘　　要：为研究螺旋爆轰胞格结构,选取预混气C_(2)H_(2)+2.5O_(2)+85%Ar,C_(2)H_(2)+2.5O_(2)+70%Ar与C2H2+5N2O在光滑管中进行爆轰实验,使用烟膜记录管道侧壁与端面胞格结构。编写MATLAB程序处理烟膜记录,比较侧壁横波间距、端面胞格直径平均值,以及相邻端面胞格中心点距离平均值与标准差。其中,侧壁横波间距明显大于管壁附近端面胞格直径平均值。另外,相较于稳定气,不稳定气近管壁与近管轴区域的端面胞格直径差异更大,不同压力下预混气C_(2)H_(2)+5N_(2)O近管壁与近管轴区域的端面胞格直径差异分别为47.91%,59.64%,40.42%与37.21%。为进一步探索爆轰波内部结构,使用CH_(4)+2O_(2)在5,15与25mm宽度的环形管进行实验,对比侧壁及端面烟膜结果,可观测到内部螺旋横波旋转方式。相对环管宽度而言,初始压力是胞格尺寸的主要影响参数,而整体上外侧壁胞格尺寸稍大于内侧壁胞格尺寸。In order to research the cellular structure of spinning detonation,pre-mixed mixtures C_(2)H_(2)+2.5O_(2)+85%Ar,C_(2)H_(2)+2.5 O_(2)+70%Ar and C_(2)H_(2)+5N_(2)O were used in the detonation experiments in smooth tube.Inner-wall and end-on cellular structure were recorded by smoked foils.A MATLAB program was written to analyze the smoked foil results.The transverse waves spacing,end-on cell diameter average,and average and variance of adjacent end-on cell center distance were compared.The transverse spacing wave is more than the endon cells average diameter which is near the tube wall.Compared with stable mixture,the end-on cells average diameter of unstable mixture shows larger difference among the end-on cells located at near tube wall and near tube axis.For unstable mixture C_(2)H_(2)+5 N_(2)O under different initial pressure,the difference of average diameter of endon cells located at near tube wall and near tube axis are 47.91%,59.64%,40.42%and 37.21%,respectively.Then,pre-mixed mixtures CH_(2)+2O_(2)was used in annular channels which are 5,15 and 25 mm width to study further the cellular structure inside of spinning detonation.The transverse wave rotation can be recorded by smoked foils on the end and inside of the channel.Compared with the channel width,initial pressure is dominant parameter for cell size.Generally,cell size on the outer-wall of the channel is larger than that on the inner-wall.

关 键 词：螺旋爆轰 胞格结构 环形管道 数字化分析 边界层效应 

分 类 号：TD774[矿业工程—矿井通风与安全] O381[理学—流体力学]