Convective and radiative heat transfer effects on premixed hydrogen-air combustion in high-speed flow

Numerical simulation was performed to evaluate the effect of wall temperature and thermal radiation accounting on the processes of hydrogen-air mixture self-ignition in a flat channel. The simulation was performed in the Ansys Fluent 2020 R1 software package. Analysis of the calculation results for various wall temperature values has shown that at temperatures above 550 K, self-ignition of the mixture and propagation of the combustion wave, which turns into detonation, occurs. The movement of the detonation wave upstream and its exit into the narrow part of the channel points to the channel chocking. It has been shown that taking into account thermal radiation promotes earlier ignition of the mixture, but does not affect the flow mode and the rates of combustion product formation.