氢燃料特性及氢微混火焰模式分析

Hydrogen is one of the most promising clean fuels in the field of future power generation, with widespread applications in gas turbine power generation. Further investigation is needed to understand the flame extinction characteristics of hydrogen and the scale relationship between turbulent flow and chemical reactions in micromix hydrogen combustion. In this study, a counterflow flame model is employed within the Cantera platform to investigate the flame extinction characteristics of hydrogen at various equivalence ratios and temperatures. The relative scale relationship of flow and chemical reactions in micromix hydrogen flames is assessed using dimensionless Damköhler (Da) and Karlovitz (Ka) numbers in conjunction with flame regime diagrams. The results indicate that at standard temperature and pressure, hydrogen exhibits flame extinction characteristics approximately ten times greater than methane. Furthermore, as the temperature increases, the flame extinction characteristics of hydrogen progressively strengthen. The micromix hydrogen combustion is influenced by both turbulence and dominant diffusion, enhancing the transport of fuel and oxidizer. Investigating the characteristics of hydrogen fuel and flame regimes in micromix hydrogen combustion provides crucial insights for the development of turbulent micromix combustion technology and the establishment of turbulent-chemical reaction combustion models.