In this study,we perform a numerical investigation of a steady laminar stagnation flow flame stabilized at a wall with the consideration of heat transport,focusing on a lean hydrogen/air mixture with a fuel/air equiva...In this study,we perform a numerical investigation of a steady laminar stagnation flow flame stabilized at a wall with the consideration of heat transport,focusing on a lean hydrogen/air mixture with a fuel/air equivalence ratio 0.6.We discuss the NO emissions and their formation rates under various conditions,such as flow velocity and combustion pressure.It is found that the predominant reaction pathway for NO formation involves NNH radicals,though this changes near the wall surface.Beyond examining the wall's influence on flame structures,the present work focuses on the impact of combustion process on materials.Specifically,the accumulation of atomic hydrogen at the wall surface is explored,which is significant for the consequent modeling of potential hydrogen embrittlement.Additionally,the growth rate of oxide layers on the material surface increases significantly if the combustion pressure and consequently the combustion temperatures are enhanced.These investigations offer valuable insights into how combustion processes affect material,which is useful for designing engineering components under high-temperature environments.展开更多
基金financial support by the DFG (project H2MAT3D,project number 523879740 within the DFG-SPP 2419 HyCAM)the Deutsche Forschungsgemeinschaft (DFG),Germany for its support within Project TH881/38-1 (DADOREN)。
文摘In this study,we perform a numerical investigation of a steady laminar stagnation flow flame stabilized at a wall with the consideration of heat transport,focusing on a lean hydrogen/air mixture with a fuel/air equivalence ratio 0.6.We discuss the NO emissions and their formation rates under various conditions,such as flow velocity and combustion pressure.It is found that the predominant reaction pathway for NO formation involves NNH radicals,though this changes near the wall surface.Beyond examining the wall's influence on flame structures,the present work focuses on the impact of combustion process on materials.Specifically,the accumulation of atomic hydrogen at the wall surface is explored,which is significant for the consequent modeling of potential hydrogen embrittlement.Additionally,the growth rate of oxide layers on the material surface increases significantly if the combustion pressure and consequently the combustion temperatures are enhanced.These investigations offer valuable insights into how combustion processes affect material,which is useful for designing engineering components under high-temperature environments.
