抄録
In the present study, to avoid water damage due to fire extinguishment, we are proposing utilization of liquid nitrogen for firefighting. To clarify the extinguishing effectiveness of liquid nitrogen on a diffusion flame, the blowoff experiments have been performed. In the extinguishing experiment, to reduce the amount of vaporization of liquid nitrogen and to avoid its scattering during the transporting process, a spherical capsule made of ice is used. The ice capsule filled with liquid nitrogen is dropped in free-fall from the height of 800 mm to the aluminum plate, in which the burner is embedded. The blowoff probability has been measured.
