Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : October 05, 2024 - October 06, 2024
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.
