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

doi:10.12066/j.issn.1007-2861.2216

上海大学学报(自然科学版) ›› 2020, Vol. 26 ›› Issue (4): 606-616.doi: 10.12066/j.issn.1007-2861.2216

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

饶飞雄, 丁珏(), 翁培奋, 李孝伟

上海大学上海市应用数学和力学研究所,上海 200072

收稿日期:2017-03-08 出版日期:2020-08-30 发布日期:2020-09-03
通讯作者: 丁珏 E-mail:dingjue_lu@shu.edu.cn
基金资助:
国家自然科学基金资助项目(11472167)

Numerical study on gasous chemical reaction mechanism and detonation wave in the detonation chamber of engine

RAO Feixiong, DING Jue(), WENG Peifen, LI Xiaowei

Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China

Received:2017-03-08 Online:2020-08-30 Published:2020-09-03
Contact: DING Jue E-mail:dingjue_lu@shu.edu.cn

摘要/Abstract

摘要：

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。

关键词: 基元反应, 敏感性分析, 爆轰波胞格结构, 三波点碰撞

Abstract:

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.

Key words: element reaction, sensitivity analysis, detonation cellular structure, triple point collision

中图分类号:

O381

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.

RAO Feixiong, DING Jue, WENG Peifen, LI Xiaowei. Numerical study on gasous chemical reaction mechanism and detonation wave in the detonation chamber of engine[J]. Journal of Shanghai University（Natural Science Edition）, 2020, 26(4): 606-616.

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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

Numerical study on gasous chemical reaction mechanism and detonation wave in the detonation chamber of engine

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