Kinetics of Detonation Initiation in the Supersonic Flow of the H2 + O2 (Air) Mixture in O2 Molecule Excitation by Resonance Laser Radiation

Abstract

The possibility of initiating detonation in the supersonic flow of the H2 + O2 (air) mixture behind the front of the inclined shock wave by O2 molecule excitation to the O2(a1Δg) and O2(b1·+g) states by laser radiation with a wavelength λI = 1.268 μm and 762 nm is considered. Resonance laser radiation intensifies chain combustion due to the formation of new pathways for generating active atoms O· and H· and radicals OH and has a substantially nonthermal character. Even at low (∼3 kJ/cm2) energies of radiation with λI = 762 nm applied to the gas, detonation combustion can occur even at a distance of 1 m from the front at the gas temperature as high as 600 K.