-
摘要: 对矩形管内临界爆轰动力学特征进行了数值分析。采用基元反应描述爆轰化学反应过程,采用二阶附加半隐的龙格-库塔法和5阶WENO格式求解二维反应欧拉方程。对于25%氩稀释化学计量比的氢氧预混气体,当管道宽度为30 mm、初温为300 K时,产生临界爆轰的预混气体初压为3.5 kPa。在此临界条件下,获得了临界爆轰胞格结构、沿壁面的速度和峰值压力曲线及流场波系演变特征。着重对比分析了矩形管内临界爆轰与普通爆轰在爆轰波速度、平均速度、胞格宽长比、横波结构、未反应气囊及旋涡结构之间的差异,深入认识了临界爆轰的不稳定性和化学反应动力学特征。Abstract: Marginal detonation dynamics in a rectangular tube was numerically analyzed in this paper. The detailed chemical reaction model was employed to describe the heat release of detonation chemical reactions. The 2nd additive semi-implicit Runge-Kutta method and 5th order Weighted Essentially Non-Oscillatory (WENO) scheme were used to integrate the two-dimensional time-dependent reactive Euler equations. For the stoichiometric hydrogen and oxygen mixture diluted by 25% argon, as the channel width is 30 mm and the initial temperature is 300 K, the critical initial pressure for marginal detonation is 3.5 kPa. Under this critical condition, the cellular pattern, the velocity and maximum pressure along the wall and the wave evolution of marginal detonation were obtained. The difference between the marginal and ordinary detonation was discussed including the detonation velocity, average velocity, the ratio of cell width to length, transverse wave structure, unreacted gas pocket and vortex structure. The intrinsic instability and chemical dynamics characteristics of marginal detonation were deeply recognized.
-
Fickett W, Davis W C. Detonation [M]. California: University of California Press, 1979: 307-337. Wang C J, Xu S L. Numerical Study on Cellular Detonation in a Straight Tube Based on Detailed Chemical Reaction Model [J]. Explosion and Shock Waves, 2005, 25(5): 405-416. (in Chinese) 王昌建, 徐胜利. 直管内胞格爆轰的基元反应数值研究 [J]. 爆炸与冲击, 2005, 25(5): 405-416. Gamezo V N, Vasil'ev A A, Khokhlov A M, et al. Fine Cellular Structures Produced by Marginal Detonations [J]. Proceedings of the Combustion Institute, 2000, 28: 611-667. Bone W A, Fraser R P, Wheeler W H. A Photographic Investigation of Flame Movements in Gaseous Explosive [J]. Philos Trans Roy Soc, London, A, 1935, 235: 29-78. Campbell C, Woodhead D W. The Ignition of Gases by an Explosive Wave [J]. J Chem Soc, 1927, 130: 1572-1578. Fay J A. A Mechanical Theory of Spinning Detonation [J]. J Chem Phys, 1952, 20: 942-950. Huang Z W, Lefebvre M H, Tiggelen P J V. Experiments on Spinning Detonations with Detailed Analysis of the Shock Structure [J]. Shock Waves, 2000, 10: 119-125. Oran E S, Young T R, Boris J P, et al. Weak and Strong Ignition(Ⅰ): Numerical Simulation of Shock Tube Experiments [J]. J Combust Flame, 1982, 48: 135-148. Zhong X L. Additive Semi-Implicit Runge-Kutta Methods for Computing High-Speed Noneqilibrium Reactive Flows [J]. J Comp Phys, 1996, 128: 19-31. Shu C W. Essentially Non-Oscillatory and Weighted Essentially Non-Oscillatory Schemes for Hyperbolic Conservation Laws [R]. ICASE Report 97-65, 1997. Wang C J. Study on Gaseous Detonation Propagation Through Tubes with Complex Geometry [D]. Hefei: University of Science and Technology of China, 2004. (in Chinese) 王昌建. 气相爆轰波在复杂管道中传播的研究 [D]. 合肥: 中国科学技术大学, 2004. Wang C J, Xu S L. Numerical Simulation on Mach Reflection of Cellular Detonation [A]. //Special Group of Shock Wave and Shock Tube of the Chinese Society of Theoretical and Applied Mechanics. Proceedings of the 11th Chinese National Symposium on Shock Wave [C]. Mianyang, 2004: 115-119. (in Chinese) 王昌建, 徐胜利. 胞格爆轰马赫反射数值模拟 [A]. //中国力学学会直属激波与激波管专业组. 第十一届全国激波与激波管学术会议文集 [C]. 绵阳, 2004: 115-119.
点击查看大图
计量
- 文章访问数: 7471
- HTML全文浏览量: 323
- PDF下载量: 803