Effect of argon dilution on detonation instability of C2H2-O2 mixture and its quantitative analysis
-
摘要: 为定量研究氩气对预混气爆轰不稳定性的影响，在管径为50.8、63.5 mm的管道内对未稀释及氩气稀释(氩气的体积分数为50%、70%、85%)的C2H2-O2预混气进行了实验研究和量化分析，通过烟膜轨迹获得了不同初始压力下各种预混气的爆轰结构。对烟膜图像进行数字化处理，得到了氩气稀释下C2H2-O2预混气爆轰轨迹的不规则度表征：轨迹间距的柱状图、标准差曲线、自相关函数。结果表明：随着氩气体积分数的升高，三波点轨迹愈加规则，不稳定性在爆轰自持传播过程中逐渐失去主导作用。稀释后预混气爆轰轨迹间距的柱状图和自相关函数的峰值和分布离散情况基本一致，与标准差分布一致。C2H2-O2-85%Ar、C2H2-O2-70%Ar、C2H2-O2预混气的柱状图主胞格尺寸占比分别为33%、23%、20%，标准差分别为2.66~6.60 mm、5.37~10.96 mm、27.63~36.67 mm，自相关函数的第1个最高峰值分别高于其他峰值1/3倍、1/6倍、1/7倍。通过分析标准差数据，拟合得到氩气的体积分数与不稳定度的多项式函数，为选取不稳定度和氩气稀释浓度提供了依据。Abstract: To investigate quantitatively the effect of argon dilution on the detonation instability of C2H2-O2 mixture, we carried out a digital comparison of smoked foils from C2H2-O2 mixtures with different Argon dilutions (with an volume fraction of 50%, 70%, and 85%, respectively) in two tubes (with an inner diameter of 50.8 mm and 63.5 mm, respectively) producing transverse waves of regular and irregular spacing and, based on the smoked foils, obtained under different initial pressures the histogram, the standard deviation and the autocorrelation function, which we then used to quantify the spacing irregularity for different cellular detonation structures. Each smoked foil was digitized and separated into left-running and right-running waves for subsequent analysis. The histogram, the standard deviation and the autocorrelation function showed consistent tendency. As the Ar dilution's volume fraction rose, the trajectory of the triple points became more regular. Similarly, mixtures of different Argon dilutions showed different degrees of irregularity in the analysis of the histograms and the autocorrelation function of the transverse waves' spacing. The proportion of the dominant mode of C2H2-O2-85%Ar, C2H2-O2-70%Ar, and C2H2-O2 were 33%, 23%, and 20%, respectively, while their standard deviation was 2.66~6.60 mm, 5.37~10.96 mm, and 27.63~36.67 mm, and their autocorrelation function peak values were higher by 1/3, 1/6, and 1/7 times. A polynomial fitted curve of the dilution and the irregularity was drawn from the standard deviation data to provide a selection basis for the instability degree and the Ar dilution's volume fraction.
-
图 3 Ø50.8 mm管道内C2H2-O2预混气烟膜
Figure 3. Smoked foils of premixed C2H2-O2 in a Ø50.8 mm tube
图 4 Ø50.8 mm管道内C2H2-O2-70%Ar预混气烟膜
Figure 4. Smoked foils of premixed C2H2-O2-70%Ar in a Ø50.8 mm tube
图 5 Ø50.8 mm管道内C2H2-O2-85%Ar预混气烟膜
Figure 5. Smoked foils of premixed C2H2-O2-85%Ar in a Ø50.8 mm tube
图 7 预混气爆轰轨迹间距数据的等间距柱状图
Figure 7. Equidistant histograms of transverse waves' spacing of premixed mixtures
图 8 预混气爆轰轨迹间距数据的等比例柱状图
Figure 8. Proportional histograms of transverse waves' spacing of premixed mixtures
图 9 Ar体积分数不同的预混气的爆轰轨迹间距标准差
Figure 9. Standard deviation of transverse waves' spacing of premixed mixtures with different Ar dilution
图 10 标准差-Ar体积分数的拟合曲线
Figure 10. Fitted curve of standard deviation versus volume fraction of Ar
-
[1] Lee J H S. The detonation phenomenon[M]. Cambridge: Cambridge University Press, 2008. [2] Lee J H S. Dynamic parameters of gaseous detonations[J]. Annual Review of Fluid Mechanics, 1984, 16(1):311-336. http://cn.bing.com/academic/profile?id=c627ef06b702ea12465db96c2f23f8a9&encoded=0&v=paper_preview&mkt=zh-cn [3] Zhang B, Bai C. Critical energy of direct detonation initiation in gaseous fuel-oxygen mixtures[J]. Safety Science, 2013, 53(2):153-159. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=47d9ad6d84550c32506192b2085e2611 [4] Zhang B, Mehrjoo N, Ng H D, et al. On the dynamic detonation parameters in acetylene-oxygen mixtures with varying amount of argon dilution[J]. Combustion & Flame, 2014, 161(5):1390-1397. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=c365a26b84dae4bd190904d5fbd329ff [5] Denisov Y H, Troshin Y K. Pulsating and spinning detonation of gaseous mixtures in tubes[J]. Doklady Akademii Nauk SSSR, 1959, 125:110-113. [6] Teng H, Ng H D, Kang L, et al. Evolution of cellular structures on oblique detonation surfaces[J]. Combustion & Flame, 2015, 162(2):470-477. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=b224c2af4563ae320ea208fc4d47dd95 [7] Sharpe G J. Transverse waves in numerical simulations of cellular detonations[J]. Journal of Fluid Mechanics, 2001, 447:31-51. doi: 10.1017/S0022112001005535 [8] 张薇, 刘云峰, 姜宗林.气相爆轰波胞格尺度与点火延迟时间关系研究[J].力学学报, 2014, 46(6):977-981. http://www.cnki.com.cn/Article/CJFDTotal-LXXB201406018.htmZhang Wei, Liu Yunfeng, Jiang Zonglin. Study on the relationship between ignition delay time and gaseous detonation cell size[J]. Chinese Journal of Theoretical and Applied Mechanics, 2014, 46(6):977-981. http://www.cnki.com.cn/Article/CJFDTotal-LXXB201406018.htm [9] Trotsyuk A V, Fomin P A, Vasil'Ev A A. Numerical study of cellular detonation structures of methane mixtures[J]. Journal of Loss Prevention in the Process Industries, 2015, 36:394-403. doi: 10.1016/j.jlp.2015.03.012 [10] 刘岩, 武丹, 王健平.低马赫数下斜爆轰波的结构[J].爆炸与冲击, 2015, 35(2):203-207. http://d.old.wanfangdata.com.cn/Conference/8699412Liu Yan, Wu Dan, Wang Jianping. Structure of oblique detonation wave at low inflow Mach number[J]. Explosion and Shock Waves, 2015, 35(2):203-207. http://d.old.wanfangdata.com.cn/Conference/8699412 [11] Lee J J, Garinis D, Frost D L, et al. Two-dimensional autocorrelation function analysis of smoked foil patterns[J]. Shock Waves, 1995, 5(3):169-174. http://cn.bing.com/academic/profile?id=6fefe13603f56671a5feb4a62a6a9146&encoded=0&v=paper_preview&mkt=zh-cn [12] Strehlow R A, Liaugminas R, Watson R H, et al. Transverse wave structure in detonations[C]// Watson R H, Eyman J R. 11th Symposium (International) on Combustion, 1967: 683-692. https://www.sciencedirect.com/science/article/pii/S0082078467801942 [13] Takai R, Yoneda K, Hikita T. Study of detonation wave structure[J]. Symposium on Combustion, 1975, 15(1):69-78. http://d.old.wanfangdata.com.cn/Periodical/tjjs201604002 [14] 徐彬, 陈成光, 糜仲春, 等.H2-O2爆轰时Ar浓度对产生胞格结构的影响[J].实验力学, 1988, 3(1):35-39. http://www.cnki.com.cn/Article/CJFDTotal-SYLX198801007.htmXu Bin, Chen Chengguang, Mi Zhongchun, et al. The effect of concentration of Ar on formation of cellular structure in H2-O2 detonation[J]. Journal of Experimental Mechanics, 1988, 3(1):35-39. http://www.cnki.com.cn/Article/CJFDTotal-SYLX198801007.htm [15] 王昌建, 徐胜利, 费立森.气相爆轰波反应区结构的平面激光诱导荧光测量[J].力学学报, 2007, 39(5):661-667. doi: 10.3321/j.issn:0459-1879.2007.05.012Wang Changjian, Xu Shengli, Fei Lisen. Study on reaction zone structure of gaseous detonation wave by planar laser induced fluorescence technique[J]. Chinese Journal of Theoretical and Applied Mechanics, 2007, 39(5):661-667. doi: 10.3321/j.issn:0459-1879.2007.05.012 [16] Radulescu M I, Ng H D, Lee J H S, et al. The effect of argon dilution on the stability of acetylene/oxygen detonations[J]. Proceedings of the Combustion Institute, 2002, 29(2):2825-2831. doi: 10.1016/S1540-7489(02)80345-5 [17] 徐晓峰, 解立峰, 彭金华, 等.环氧丙烷-空气混合物爆轰波胞格结构的研究[J].爆炸与冲击, 2004, 24(2):158-162. doi: 10.3321/j.issn:1001-1455.2004.02.010Xu Xiaofeng, Xie Lifeng, Peng Jinhua, et al. Study on the detonation cellular structure of propylene epoxide-air[J]. Explosion and Shock Waves, 2004, 24(2):158-162. doi: 10.3321/j.issn:1001-1455.2004.02.010 [18] 程关兵, 李俊仙, 李书明, 等.氢气/丙烷/空气预混气体爆轰性能的实验研究[J].爆炸与冲击, 2015, 35(2):249-254. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=bzycj201502016Cheng GuanBing, Li JunXian, Li ShuMing, et al. An experimental study on detonation characteristics of binary fuels hydrogen/propane-air mixtures[J]. Explosion and Shock Waves, 2015, 35(2):249-254. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=bzycj201502016 [19] Golovastov S, Golub V, Mikushkin A. Stability of acetylene-propane-butane and acetylene-hydrogen gas mixtures subjected to shock wave action[J]. Fuel, 2014, 126(12):213-218. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=5894fef7f386f70a54d7093a59179a73 -
下载:
图(11)
计量
- 文章访问数: 4512
- HTML全文浏览量: 1377
- PDF下载量: 397
- 被引次数: 0