Numerical study of the effect of methane combustion on heat and mass transfer and friction in the boundary layer

Calculation results are presented for laminar and turbulent boundary-layer flows on a porous plate with methane injection and combustion. The mathematical model is based on the boundary-layer approximation. Combustion was simulated by one global finite-rate reaction and the kinetic mechanism of hydrogen and carbon oxide afterburning. It is shown that injection and combustion in laminar and turbulent flows lead to more intense displacement of the flow away from the wall than in the case of injection into an isothermal flow, which decreases the friction drag and heat and diffusion fluxes. Combustion in a turbulent flow leads to flow laminarization and delay of the laminar–turbulent transition.