Challenges in Flame–Wall Interaction of Hydrogen Combustion
Please login to view abstract download link
Hydrogen combustion systems operated under fuel-lean conditions offer great potential for achieving ultra-low emissions. However, such operating conditions are highly susceptible to intrinsic flame instabilities, namely hydrodynamic and thermodiffusive instabilities, which markedly alter the flame structure and may be further intensified by turbulence. As practical combustion chambers, such as internal combustion engines, are typically enclosed by solid boundaries, flame–wall interactions (FWI) inevitably occur, further complicating the combustion process. These interactions can significantly affect pollutant formation and reduce overall combustion efficiency. In the context of lean hydrogen combustion, this introduces an additional challenge, namely, how intrinsic flame instabilities influence or interact with the quenching process. To investigate these effects, we perform direct numerical simulations of FWI for lean hydrogen flames across various laminar and turbulent configurations using detailed chemical kinetics and transport. The study introduces configurations of increasing complexity from laminar head-on quenching at different operating conditions, over laminar side-wall quenching with varying wall temperature boundary conditions, and to turbulent channel flow flames with different turbulence intensities.
