Abstract: Taking loading and unloading station of LPG tank truck in an industrial park as an example, a physical model is established, and CFD method is used to simulate the leakage and explosion scenarios of LPG tank truck with different leakage rates in open space and partially blocked space. The results show that the close trees resist most of the initial kinetic energy of LPG leakage, and the LPG leakage stays within the range of 20 m. Over 20 m, the leakage is mainly affected by the dominant wind direction. Under the influence of trees, LPG spreads radially. The leakage area is large, but the LPG volume fraction is low. In an explosion scenario, explosion overpressure can be affected by many factors such as accelerated flame propagation, spatial blocking probability and volume fraction of LPG. For 25 mm leak aperture, explosion overpressure is basically the same in the case with or without trees, mainly because LPG does not leak into the tree area. For 200 mm leak aperture, the short-range explosion overpressure is affected by the volume fraction of LPG, the intermediate stage by the spatial blocking probability, and the final stage by the volume fraction of LPG. The maximum explosion overpressure is 5 739 Pa, which occurs 80 m away from the ignition point.

Key words: locally blocked space, LPG tank car, leakage and explosion scenarios, volume fraction, overpressure