Chemical generation of atomic iodine for chemical oxygen–iodine laser. I. Modelling of reaction systems

Modeling of the chemical generation of atomic iodine in a chemical oxygen-iodine laser

“…However, it is a disadvantage of this process, that the produced atoms are rapidly recombinated in the presence of NO 2 . The results of 1-D modelling of this system 4 are only in some respect in quantitative accordance with the results from the experiments. The new results of modeling of the production of atomic iodine via atomic fluorine are presented in this paper, including the dependence on the initial pressure and dilution with the inert gas.…”

“…The contribution of HF* can exceed 56 %, according to Jonathan et al's study.' 3 The exoergicity of the reaction (5) may suffice even to form electronically excited iodine atoms, I( 2 p1/ 2 ) with the branching ratio that was theoretically estimated' 5 up to the value of 0.5, however the experimental value obtained by using a high resolution Fourier transform spectrometer" 4 did not exceed the value of 0.005. The resultant efficiency of I atom production is influenced (in addition to the above loss-processes of F atoms) by the reactions which consume I atoms, the termolecular recombination of I atoms in the presence of buffer gas (He) and molecular iodine 16 …”

“…One-dimensional numerical model used in our previous paper 4 supposed the constant velocity of gas and consequently constant volume flowrate. However, this assumption is not valid in the case of highly exothermic reactions where temperature significantly rises along the reaction coordinate, the mixture expands and accelerates.…”

“…3 ' 4 Atomic iodine produced in this way can then undergo the energy transfer from singlet oxygen contained in the gas flow. Because the reaction of hydrogen iodide with both atomic fluorine and chlorine is very fast, the chemical efficiency of atomic iodine production is determined by the efficiency of the preparation of atomic fluorine (in reaction F 2 + NO) or chlorine (C10 2 + NO).…”

“…To estimate the efficiency of these processes, a simplified one-dimensional (l-D) kinetic model was proposed and numerically solved for both reaction systems. 4 In this modeling, a constant gas velocity and constant total enthalpy were assumed, and the diffusion of species and heat transfer along the flow were neglected. The calculations were performed for the conditions that correspond with the subsonic channel, i.e., upstream the nozzle throat, in the supersonic COIL device operated in our laboratory: the total pressure of 4 kPa, temperature of 300 K, velocity of 200 m/s.…”