Abstract: In order to ensure the accuracy of the research on the thermal radiation of large storage tank pool fire, the full surface pool fire experiment of diesel oil was carried out with 1.0 m oil pan and 11.5 m liquid pool, and the combustion rate and thermal radiation distribution law were obtained. Using the combustion rate and thermal radiation data obtained from the experiment, the FDS turbulent subgrid model and the number of radiation angles are optimized. It is concluded that when using the constant coefficient Smagorinsky model and 500 radiation angles, the simulation is in good agreement with the experiment, and the FDS simulated thermal radiation value is slightly smaller than the experimental value. The influence of tank size and wind speed on the surrounding thermal radiation and safety distance is studied. The results show that: for tanks with different sizes, the thermal radiation attenuation rate of the tank top plane changes with 100 kW/m2 as the dividing point; with the increase of tank size, the absolute safe distance tends to a stable value, and the ratio to tank diameter gradually decreases. At different wind speeds, 12 m/s is the critical wind speed near the ground. When it is greater than 12 m/s, the downwind heat radiation will not change with the increase of wind speed, and the maximum value is 8 kW/m2; Tank top plane, with the increase of wind speed, the windward safety distance remains unchanged; The critical wind speed in the downwind direction is 9 m/s. When it is greater than 9 m/s, the safety distance is basically unchanged with the increase of wind speed.

Key words: storage tank, pool fire, thermal radiation, simulation parameters, safe distance