Treatment of the Thermal Nonequilibrium and Ionization Effects on the Refractive Index of a Reacting Gas: Atmospheric Air and Combustion Products

Using thermal nonequilibrium physicochemical kinetics models, allowing to numerically study the reacting gas flows with allowance for the processes of vibrational and electronic-translational relaxation and exchange as well as chemical and plasma-chemical reactions based on the data on electrical properties (polarizability, dipole moment) of neutral and charged gaseous species in their ground and excited electronic states, the profiles of the Gladstone – Dale constant and refractive index are calculated for two model problems: relaxation of air behind the shock wave front and expansion of hydrogen and syngas combustion products in a supersonic nozzle. For each of the problems, the analysis of accuracy of different approximations in calculation of the gas optical properties is carried out.

refractive index, Gladstone – Dale constant, vibrational nonequilibrium, electronic excitation, ionization

Volume 24, issue 4, 2023 year

Учет влияния термической неравновесности и ионизации на показатель преломления реагирующего газа: атмосферный воздух и продукты сгорания

С использованием термически-неравновесных моделей физико-химической кинетики, позволяющих численно исследовать течения реагирующего газа с учетом про-цессов колебательно- и электронно-поступательной релаксации и обмена, а также химических и плазмо-химических реакций на основе данных об электрических свойствах (поляризуемость, дипольный момент) нейтральных и заряженных компонентов газа в основном и возбужденных состояниях рассчитаны профили константы Гладстона – Дейла и показателя преломления для двух модельных задач: релаксация воздуха за фронтом ударной волны и расширение продуктов сгорания водорода и синтез-газа в сверхзвуковом сопле. Для каждой из задач проведен анализ точности различных приближений при расчете оптических свойств газа.

показатель преломления, константа Гладстона – Дейла, колебательная неравновесность, электронное возбуждение, ионизация

Volume 24, issue 4, 2023 year

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