Abstract
We have experimentally investigated a medium-size pool fire of ethanol in a compartment with a natural and a mechanical-ventilation system. Special attention was paid to interaction between ventilation of compartment and a pool fire. The pool diameter was set to 600 mm, which caused the rapid increase in the compartment pressure just after the ignition. The negative pressure with mechanical ventilation, which is weaker than the pressure increase, restrained air supply with natural ventilation and resulted in the fire extinguishing due to lack of oxygen in the compartment. On the other hand, the negative pressure, which is much stronger than the pressure increases, sustained air supply and led to the oscillation of oxygen concentration and fire in the compartment.
