Hydrogen/air burner-stabilized flames at elevated pressures
Hydrogen/air burner-stabilized flames at elevated pressures
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DOI：
10.1016/j.combustflame.2017.07.001
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发表时间：
2017-11
影响因子：
4.4
通讯作者：
V. Gubernov;V. Bykov;U. Maas
中科院分区：
文献类型：
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作者：
V. Gubernov;V. Bykov;U. Maas
尽管在理解氢气燃烧动力学方面取得了进展，但仍需要进一步研究高压下以及不同壁温和气体温度、局部当量比等条件下火焰-壁相互作用的细节。通过改变燃烧器的间隔距离、压力、温度和混合物成分，燃烧器稳定火焰配置可以有效地用于研究化学动力学的不同方面。此外，对燃烧器稳定火焰的非稳态动力学分析可以深入了解火焰的瞬态过程。在当前的研究中，重新审视并数值研究了扁平多孔塞式燃烧器火焰配置，以研究高压、低温和接近固定极限下的燃烧系统。氢/空气燃烧系统考虑了详细的分子传输（包括热扩散）和各种不同的化学反应机制。稳定性的丧失、火焰振荡的动力学、混合物成分和燃烧器温度的影响是研究的重点。详细研究了质量流量临界值对系统参数的依赖性。特别是，发现随着压力的增加，不同机制的临界值结果几乎是随机分布的，即这些参数可以被认为是独立的。
In spite of the progress made in understanding of the kinetics of hydrogen combustion there is a demand for further investigation of the detailed aspects of the flame-wall interaction under elevated pressure and under conditions of different wall and gas temperatures, local equivalence ratios etc. The burner stabilized flame configuration can be efficiently used to study different aspects of chemical kinetics by varying the stand-off distance, pressure, temperature of the burner and mixture compositions. Moreover, the analysis of the unsteady dynamics of the burner stabilized flames can give a deep insight into transient processes in flames. In the current study, a flat porous plug burner flame configuration is revisited and investigated numerically to study combustion systems at high pressures, low temperatures and at near stationary limits. A hydrogen/air combustion system is considered with detailed molecular transport including thermo-diffusion and with variety of different chemical reaction mechanisms. The loss of stability, dynamics of the flame oscillations, effects of the mixture composition and of the burner temperature are in the focus of the study. A dependence of critical values of the mass flow rate on system parameters is investigated in detail. In particular, it was found that the results of critical values for different mechanisms with increasing the pressure scatter almost randomly i.e. these parameters can be considered as independent.