Abstract: According to the combustion characteristics of oil fire, FLACS software was used to simulate the combustion process of small scale 0.5 m oil pool fire and the leakage and fire process of large scale field combined soft oil sac. The results show that: the distribution of maximum heat radiation flux of oil pool fire combustion is not strictly symmetrical with the central axis of oil pool. In the process of flowing fire combustion after oil leakage of the outdoor combined oil sac, the maximum radiation intensity received by the whole self- loading pallet is up to 35 kW/m2, and the maximum radiation intensity received by the oil sac is about 18 kW/m2. 20 seconds after the oil fire occurs, the thermal radiation intensity of the oil sac can reach the minimum energy for oil sac melting.

Key words: oil fire, thermal radiation, FLACS, numerical simulation, oil sac