Numerical study of combustion initiation in a supersonic flow of H-2-air mixture by resonance laser radiation

作者：Bezgin L V^*; Kopchenov V I; Kuleshov P S; Titova N S; Starik A M

来源：Journal of Physics D: Applied Physics , 2012, 45(8): 085401.

DOI：10.1088/0022-3727/45/8/085401

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-2-air mixture is conducted. The kinetic processes responsible for the intensification of chain reactions in premixed and non-premixed H-2-air flows upon photodissociation of O-2 molecules by 193.3 nm laser radiation, excitation of these molecules to the singlet sigma state by laser photons with 762.346 nm 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.

• 出版日期2012-2-29