Numerical simulation of pollutant diffusion process in the cabin of a nuclear submarine
In order to solve the safety problems of harmful gas and small particles leaking out in the daily work of nuc-lear submarine,and the diffusion of carbon dioxide generated in the process of personnel activities in the ship,the numerical simulation study of gas and particle diffusion characteristics was carried out.The Species component transport and DPM dis-crete phase model is used to study the concentration field of gas and small particles diffusion under different ventilation structures,and the influence of supply air speed on the concentration field of gas and small particles diffusion in nuclear sub-marine is analyzed.The results show that the lateral ventilation structure has a good dilution ability compared with the mixed ventilation and displacement ventilation structure.Under the 2.0 m/s supply speed,the carbon dioxide concentration is re-duced to 1.4× 10-5,the harmful gas concentration is reduced to 5.5×10-7,and the particle residence time is shortened to 217 s.With the increasing of air supply speed,the gas concentration and particle residence time are greatly reduced,but the tiny particles mainly stay at y=3 m,accounting for about 35％.
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