Ar稀释C2H2+2.5O2预混气高频爆轰的端面结构

赵焕娟; 伯玉兰; 张英华; 严屹然

doi:10.11883/bzycj-2017-0098

Ar稀释C₂H₂+2.5O₂预混气高频爆轰的端面结构

doi: 10.11883/bzycj-2017-0098

北京科技大学资源与工程学院, 北京 100083

基金项目:

国家自然科学基金项目 11602017

中央高校基本科研业务费专项项目 FRF-TP-15-105A1

中国博士后科学基金项目 2015M580049

详细信息

作者简介:
赵焕娟(1985-), 女, 博士, 副教授

通讯作者:
张英华, zyhustb@163.com

中图分类号: O381;TD774
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- 文章访问数: 4829
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- 被引次数: 0
出版历程
- 收稿日期: 2017-03-29
- 修回日期: 2017-09-08
- 刊出日期: 2018-09-25

High-frequency spiral detonation end-on records of premixed C₂H₂+2.5O₂ with different argon dilution

School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China

摘要

摘要: 为了研究预混气爆轰的内部结构，对不同浓度的Ar稀释的C₂H₂+2.5O₂预混气进行爆轰实验和数值计算。首先，在内径63.5 mm的管道内进行爆轰实验，使用烟熏玻璃记录了不同初始压力下C₂H₂+2.5O₂预混气的爆轰端面结构。使用数字化图像处理技术来分析烟熏玻璃记录的三波点轨迹，以减少人为误差。然后，观察实验结果并描绘规则图形，图像识别程序经过验证后，用于分析实验结果。从端面结构中对封闭图形进行圆的拟合，用胞格半径方差来表示胞格大小的均匀程度；用相邻胞格圆心距的方差来表示胞格分布的规则程度。通过对比不同Ar稀释下半径方差和圆心距方差随胞格数量的变化，给出不同浓度Ar稀释下C₂H₂+2.5O₂预混气的端面胞格尺寸及分布规律，随着Ar浓度的升高，预混气端面胞格分布更加规律。
- 乙炔预混气 /
- 爆轰实验 /
- 烟熏玻璃 /
- 稳定性 /
- 端面胞格结构
Abstract: In order to study the internal structure of premixed gas detonation, detonation experiments and calculation analysis of C₂H₂+2.5O₂ premixed gas diluted with different concentrations of argon were performed. Firstly, the detonation experiment was carried out in a pipe with an internal diameter of 63.5 mm. The detonation end-on structures of C₂H₂+2.5O₂ premixed gas under different initial pressures were recorded by using smoke glass. Digital image processing was used to analyze the three-point of smoked glass records to reduce human errors. Then, the regular graphics were obtained after the examination of experimental results, the calculations of experimental results were performed using a verified program. From the end-on structure, the closed graph is fitted with circle. The uniformity of cell size was expressed by the variance of cell radius. The regularity of the distribution of cell lattices was expressed by the variance of the distance between the centers of adjacent cells. By comparing the variance of the radius and the variance of the center distance with the change of cell number in different argon dilution, the size and distribution regulation of C₂H₂+2.5O₂ premixed gas under different argon dilution were given. With the increase of argon concentration, the size and distribution of the cell is more regular.
- premixed C₂H₂-O₂ mixtures /
- detonation experiment /
- smoked glasses /
- stability /
- end-on cellular structure

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图 1 直径63.5 mm爆轰管道的结构简图

Figure 1. Schematic diagram of detonation tube with diameter of 63.5 mm

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图 2 C₂H₂+2.5O₂+70%Ar预混气的烟膜记录

Figure 2. Smoked foils records of premixed C₂H₂+2.5O₂+70%Ar

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图 3 C₂H₂+2.5O₂+85%Ar预混气的烟膜记录

Figure 3. Smoked foils records of premixed C₂H₂+2.5O₂+85%Ar

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图 4 C₂H₂+2.5O₂+70%Ar预混气的端面示意图

Figure 4. End-on result of premixed C₂H₂+2.5O₂+70%Ar

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图 5 C₂H₂+2.5O₂+85%Ar预混气的端面示意图

Figure 5. End-on result of premixed C₂H₂+2.5O₂+85%Ar

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图 6 预混气端面处理结果示意图

Figure 6. Schematic diagram of end-on results of premixed gas

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图 7 C₂H₂+2.5O₂+70%Ar预混气爆轰端面结构半径等间距直方图

Figure 7. Histograms with same radius distance

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图 8 C₂H₂+2.5O₂+70%Ar预混气爆轰端面结构圆心距等间距直方图

Figure 8. Histograms with same center distance

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图 9 C₂H₂+2.5O₂+85%Ar预混气爆轰端面结构半径等间距直方图

Figure 9. Histograms with same radius distance

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图 10 C₂H₂+2.5O₂+85%Ar预混气爆轰端面结构圆心距等间距直方图

Figure 10. Histograms with same center distance

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图 11 不同浓度预混气胞格半径方差随胞格数的变化

Figure 11. Variation of radius variance with numberof cell for different Ar concentrations

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图 12 不同浓度预混气相邻胞格圆心距方差随胞格数的变化

Figure 12. Variation of center distance variance with numberof cell for different Ar concentrations

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表 1 预混气在不同压力状况下的半径方差、圆心距方差及胞格数

Table 1. Radius variance, center distance variance and number of cells under different pressures

压力状况	V(r)/mm	V(l)/mm	n
(a)	4.032 6	5.944 0	34
(b)	3.140 5	5.091 7	39
(c)	1.107 0	2.098 0	77
(d)	0.255 1	0.561 7	119

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表 2 C₂H₂+2.5O₂+70%Ar在不同压力下的半径方差和圆心距方差

Table 2. Radius variance, center distance variance ofC₂H₂ +2.5O₂+70% Ar under different pressures

p/kPa	V(r)/mm	V(l)/mm
5.32	3.169 8	9.983 9
5.74	2.446 1	7.080 4
7.45	2.145 4	5.511 7
10.57	0.674 8	2.189 6
12.71	0.331 2	1.218 9

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表 3 C₂H₂+2.5O₂+85%Ar在不同压力下的半径方差和圆心距方差

Table 3. Radius variance, center distance variance ofC₂H₂ +2.5O₂+85% Ar under different pressures

p/kPa	V(r)/mm	V(l)/mm
8.40	11.779 9	26.149 0
10.50	5.065 9	10.481 2
14.00	1.910 5	6.992 6
15.57	1.905 4	5.861 6
16.23	1.354 0	4.797 7

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