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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Numerical study of combustion initiation in a supersonic flow of H_2air mixture by resonance laser radiation
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Numerical study of combustion initiation in a supersonic flow of H_2air mixture by resonance laser radiation

机译：共振激光辐射在H_2空气混合物超声速燃烧中引发燃烧的数值研究

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摘要

A comparative analysis of the efficiency of approaches based on the exposure of reacting gas to resonance laser radiation to enhance combustion in a supersonic flow of H_2air mixture is conducted. The kinetic processes responsible for the intensification of chain reactions in premixed and non-premixed H_2air flows upon photodissociation of O_2 molecules by 193.3nm laser radiation, excitation of these molecules to the singlet sigma state by laser photons with 762.346nm wavelength and heating the mixture by laser radiation are analysed in a detailed manner. It is shown that both photochemical methods, photodissociation and excitation of O_2 molecules, are much more effective in shortening the ignition delay length than merely heating the mixture. For the premixed flow, the photodissociation of O_2 molecules ensures a slightly higher reduction in the ignition delay than the laser-induced excitation of molecular oxygen to the singlet sigma state. However, in the non-premixed flow the situation is inverted. The analysis shows that both photochemical methods make it possible to raise the efficiency of conversion of reactant chemical energy to thermal energy released during combustion compared with the method of heating the mixtures.
机译：进行了基于反应气体暴露于共振激光辐射以增强H_2空气混合物超音速燃烧的方法效率的比较分析。 O_2分子通过193.3nm激光辐射进行光离解，通过762.346nm波长的激光光子将这些分子激发为单线西格马状态并通过加热混合物来加热H_2air中链反应的动力学过程。详细分析激光辐射。结果表明，光化学方法，光解离和O_2分子的激发都比仅加热混合物更有效地缩短了点火延迟时间。对于预混流，O_2分子的光解离可确保点火延迟的降低比激光诱导的分子氧激发到单线西格玛状态的点火延迟稍高。但是，在非预混合流中，情况是相反的。分析表明，与加热混合物的方法相比，两种光化学方法都可以提高反应物化学能转化为燃烧过程中释放的热能的效率。

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