Numerical study on gasous chemical reaction mechanism and detonation wave in the detonation chamber of engine
Received date: 2017-03-08
Online published: 2020-09-03
爆轰波结构中存在气体动力学和化学反应的非线性强耦合作用。针对二十步基元反应模型和基于敏感性分析简化的九步反应模型,结合二维欧拉方程,采用 Roe 格式求解对流项、二阶迎风格式进行插值,对脉冲爆震发动机爆震室内 H2/O2 爆轰过程进行数值研究,获得了与爆轰经典 CJ 理论和实验结果较为一致的爆轰参数,表明采用带有化学反应的模型是可行的。通过数值分析爆轰波胞格的精细结构,得出：相比于九步基元反应模型,二十步的基元反应模型能较为准确地描述三波点的碰撞和演化,更好地解释反应区与入射激波的解耦,而与马赫干强耦合现象。基于二十步基元反应模型数值讨论了爆震室中添加惰性气体 Ar 对反应的稀释作用,以及气相初始压强降低对氢氧混合气体爆轰性质的影响。
饶飞雄, 丁珏, 翁培奋, 李孝伟 . 发动机爆震室气相化学反应机理及爆轰波性质的数值研究[J]. 上海大学学报(自然科学版), 2020 , 26(4) : 606 -616 . DOI: 10.12066/j.issn.1007-2861.2216
The strong nonlinear coupling of gas dynamics and chemical reactions exists in the structure of detonation wave. Based on sensitivity analysis, a 20-step element reaction model and 9-step reaction model are utilized with Euler equations. Roe scheme is used to solve the convective term and second order upwind format is used for interpolation. A numerical study on the detonation of H2/O2 in a pulse detonation engine is conducted. Calculated detonation parameters agree with CJ theory and experimental data, which show that the physical models with chemical reactions used in this study are correct. In addition, the detonation cellular structure is numerically analyzed. The 20-step reaction model can describe the collision and evolution of the triple point more accurately than the 9-step reaction model. It can also better explain the decoupling between reaction zone and incident shock wave as well as strong coupling with Mach stem. Therefore, the effects of inert-gas (Ar) dilution and the initial pressure of the gas phase on detonation in a detonation chamber are discussed based on the 20-step reaction model.
| [1] | 张群, 范玮, 徐华胜. 中国脉冲爆震发动机技术研究现状及分析[J]. 航空发动机, 2013,39(3):18-22. |
| [2] | Fickett W, Davis W C. Detonation theory and experiment[M]. New York: Mineola, 1999: 1-10. |
| [3] | Lee J H S. The detonation phenomenon [M]. Cambridge: Cambridge University Press, 2008: 1-3. |
| [4] | Kessler D A, Gamezo V N, Oran E S. Simulations of flame acceleration and deflagration-to-detonation transitions in methane-air systems[J]. Combustion and Flame, 2010,157(11):2063-2077. |
| [5] | Heidari A, Ferraris S, Wen J X, et al. Numerical simulation of large scale hydrogen detonation[J]. International Journal of Hydrogen Energy, 2011,36(3):2538-2544. |
| [6] | Wang Y H, Wang J P, Qiao W Y. Effects of thermal wall conditions on rotating detonation[J]. Computers and Fluids, 2016,140:59-71. |
| [7] | 张薇, 刘云峰, 姜宗林. 气相爆轰波胞格尺寸与点火延迟时间关系研究[J]. 力学学报, 2014,46(6):977-981. |
| [8] | 张德良, 谢巍, 郭长铭, 等. 气相爆轰胞格结构和马赫反射数值模拟[J]. 爆炸与冲击, 2001,21(3):161-167. |
| [9] | 刘云峰, 王健平. 有限谱 ENO 格式在爆轰波数值模拟中的应用[J]. 爆炸与冲击, 2003,23(3):343-348. |
| [10] | Oran E S, Weber J W, Stefaniw E I, et al. A numerical study of a two-dimensional H$_{2}$-O$_{2}$-Ar detonation using a detailed chemical reaction model[J]. Combustion and Flame, 1998,113(1/2):147-163. |
| [11] | Fukuda M, Dzieminska E, Hayashi A K, et al. Effect of wall conditions on DDT in hydrogen-oxygen mixtures[J]. Shock Waves, 2013,23(3):191-200. |
| [12] | 董刚, 范宝春, 谢波. 氢气-空气混合物中瞬态爆轰过程的二维数值模拟[J]. 高压物理学报, 2004,18(5):40-46. |
| [13] | 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):23-34. |
| [14] | 张宝亮, 丁珏, 王庆涛, 等. 约束空间可燃气体燃烧爆轰特性的数值研究[J]. 中国安全生产科学技术, 2012,8(8):23-27. |
| [15] | Nettleton M A. Gaseous detonations: their nature, effects and control[M]. New York: Chap man and Hall, 1987: 30-31. |
| [16] | 李雪松. 各向同性湍流大涡模拟中 Roe 格式适用性研究[J]. 工程热物理学报, 2015,36(11):2348-2351. |
| [17] | Bhattacharjee B, Schwer D A, Barton P I, et al. Optimally-reduced kinetic models: reaction elimination in large-scale kinetic mechanisms[J]. Combustion and Flame, 2003,135(3):191-208. |
| [18] | Turanyi T. Applications of sensitivity analysis to combustion chemistry[J]. Reliability Engineering and System Safety, 1997,57(1):41-48. |
/
| 〈 |
|
〉 |
