Two-dimensional detailed numerical simulation of ammonia/hydrogen/air detonation: hydrogen concentration effects and transverse detonation wave structure

IF 1.7 4区 工程技术 Q3 MECHANICS
S. Kohama, T. Ito, N. Tsuboi, K. Ozawa, A. K. Hayashi
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Abstract

Numerical simulations on ammonia/hydrogen/air detonation are performed using a detailed reaction model to investigate the cellular instability and detonation dynamics as a function of hydrogen content. The UT-LCS model that includes 32 species and 213 elementary reactions is used in the present simulations. The fifth-order target compact nonlinear scheme captured the unstable detonation dynamics and the complicated flow structure including the propagation of a sub-transverse wave. The simulation performed with different hydrogen dilutions shows that the detonation propagates at the Chapman–Jouguet velocity for all cases, and the cell size for the ammonia/hydrogen mixing ratio \(\alpha =0.3\) becomes approximately 10 times larger than that for \(\alpha =1.0\) (hydrogen/air mixture). A transverse detonation produces a finescale cellular structure on the computed maximum pressure history. This complex shock formation is similar to those of a spinning detonation and two-dimensional propane/oxygen detonation. The cellular irregularity increases with decreasing hydrogen content because ammonia destabilizes the detonation cellular structure with a reduced activation energy of more than approximately 8.

Abstract Image

氨/氢/空气爆轰的二维详细数值模拟:氢浓度效应和横向爆轰波结构
利用详细的反应模型对氨/氢/空气引爆进行了数值模拟,以研究细胞不稳定性和引爆动力学与氢含量的函数关系。UT-LCS模型包括32个物种和213个基本反应。五阶目标紧凑非线性方案捕捉了不稳定的引爆动力学和复杂的流动结构,包括亚横波的传播。不同氢稀释度的模拟结果表明,在所有情况下,爆轰都以 Chapman-Jouguet 速度传播,氨/氢混合比 \(\alpha =0.3\)时的单元大小大约是 \(\alpha =1.0\)(氢/空气混合物)时的 10 倍。在计算的最大压力历史上,横向爆轰产生了细尺度的蜂窝结构。这种复杂的冲击形成类似于旋转爆轰和二维丙烷/氧气爆轰。蜂窝的不规则性随着氢含量的降低而增加,这是因为氨破坏了起爆蜂窝结构的稳定性,其活化能降低了约8以上。
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来源期刊
Shock Waves
Shock Waves 物理-力学
CiteScore
4.10
自引率
9.10%
发文量
41
审稿时长
17.4 months
期刊介绍: Shock Waves provides a forum for presenting and discussing new results in all fields where shock and detonation phenomena play a role. The journal addresses physicists, engineers and applied mathematicians working on theoretical, experimental or numerical issues, including diagnostics and flow visualization. The research fields considered include, but are not limited to, aero- and gas dynamics, acoustics, physical chemistry, condensed matter and plasmas, with applications encompassing materials sciences, space sciences, geosciences, life sciences and medicine. Of particular interest are contributions which provide insights into fundamental aspects of the techniques that are relevant to more than one specific research community. The journal publishes scholarly research papers, invited review articles and short notes, as well as comments on papers already published in this journal. Occasionally concise meeting reports of interest to the Shock Waves community are published.
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