Abstract
The mechanism of flame extinction is classified into three groups of (1) quenching due to heat loss (thermal effect), (2) quenching based on flammability limits (chemical effect), and (3) quenching by flame stabilizing limit (aerodynamic effect), and the foundamental problems of each mechanism are discussed from a stand-point of combustion physics and chemistry. In first group, the utilization of heat dissipation due to solid surface such as wire gauze, inert powder and porous metals, and the latent heat of li iuid vaporization are dealt with, in second group, the limits of inflammability of fuel-air mixtures and the effect of additives as inert gases and inhibitors are main subject, and in last group, the possibility of using the blow off of flame by high speed air flow is discussed.In particula, author spends much space for the combustion inhibiting effect of halogenated hydrocarbons and alkali metal salts under expectation of appearance of more effective method for fire extinction.
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