Abstract: Abstract: High-expansion foam generator is a kind of fire-fighting equipment used by large ships and plays an important role in fighting LNG and oil fires. The foaming ratio is an important indicator of the equipment, and parameters such as wind pressure and wind speed have a greater impact on it, and design and experimental research are needed. Changing the number of layers, angles and spacing between layers of the air duct, and using numerical simulation analysis, the distribution of wind speed at different working conditions of the foamed mesh is obtained. According to the mesh size parameter, the foaming ratio is tested and researched. The results show that with the increase of the number of air duct layers and the matching of angles and spacings, the uniformity of wind speed can be effectively improved. The increase in mesh size can effectively increase the wind pressure, but it will cause the expansion ratio to decrease.

Key words: Key words: high expansion foam generator, air duct, expansion ratio, wind speed