Investigation of ignition of hydrogen–oxygen mixtures within the range of temperatures from $700$ to $2500$ K

The results of numerical modeling of the ignition process of hydrogen–oxygen mixtures diluted with argon at temperatures of $700$–$2500$ K within wide ranges of the initial gas parameters are presented. The time evolutions of the concentration of the electron-excited radical $\rm{OH}^*$ and other components, as well as the strength of the radical total radiation on wavelengths about $\lambda = 306.4$ nm, are calculated. Their peculiarities are described and the correspondence between the measured radiation strength scans obtained in the experiments by the emission method and those calculated in the process of modeling is determined. The temperatures upon which the mixtures ignite are determined. The dependences of the time delay of the ignition of the mixture on the pressure and component composition are found. The relationships are used to obtain the temperature dependence of the ignition time delay reduced to a preliminarily chosen pressure and gas composition.