Blast-proof units are used in explosive production applications to isolate the adjacent unit from damaging shockwave effects in the event of an accidental explosion. The damage is mainly caused by the transmission wave through the wall and the diffraction wave over the upper edge. Investigation on the blast flow field in blast-proof units subjected to internal blast loading is studied by numerical simulation in the current paper. The influence of the height of the proof unit is analyzed and on the cap situation is studied. The result shows that increasing the height of blast-proof units may not have a positive effect on reducing the diffraction wave, because it may enhance the reflection wave, which might have a greater effect than the diffraction wave. We can reduce the shock wave in the next unit by adding a cap, which is very effective. The study may contribute to further understanding on the experiment results and the design of blast-proof units.

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