Abstract
An experimental investigation on the vacuum extinction method (VEM) has been performed using a methane-air diffusion flame as an extinguishing target. The blowoff probability has been measured by varying the vacuuming position to the flame and the vacuuming time from 10ms to 60000ms. From the results, it is possible to define the minimum extinguishing time, below which the blowoff probability does not show unity. Moreover, we can clarify the optimum position to extinguish the flame with the vacuuming extinguishment method.
