フッ素樹脂の難燃性に及ぼす周囲の気体流速の影響

抄録

The flammability limits of counter-flow diffusion flames of difluoromethane (CH₂F₂) and methane (CH₄) are numerically investigated to clarify the underlying cause of the significant decrease in the limiting oxygen concentration of ETFE under microgravity and low-flow velocity conditions. A comparison of the adiabatic flame temperature with the maximum temperature of the counter-flow diffusion flame reveals that CH₂F₂ shows a greater tendency than CH₄ to reduce the flame temperature under higher strain rates. Additionally, CH₂F₂ experiences blow-off at a lower strain rate compared to CH₄. These trends replicate the LOC behavior of ETFE, suggesting that the flammability characteristics of ETFE can be effectively examined by analyzing the combustion properties of hydrofluorocarbons.