Abstract: Smoke pot is an effective means to implement the passive interference to near-earth laser weapon system. The spatiotemporal distribution characteristics of smoke mass concentration of smoke pot is studied to accurately obtain the laser transmission characteristics in the smoke environment. Based on the discrete phase diffusion model, Fluent software is used to simulate the smoke diffusion process of a small smoke pot. The spatial and temporal distribution characteristics of smoke mass concentration at different stages after the release of smoke, as well as the influence laws of wind speed, mass flow rate and other parameters on the diffusion velocity and mass concentration distribution of smoke were analyzed. The results show that the smoke is like an umbrella during spurting when there is no wind, and when the spurting stops, the smoke is like a cloud in the diffusion stage and there is a smoke ring with high mass concentration. The optimum wind speed under the simulation conditions is around 2-3 m/s. The spatial mass concentration of smoke has a linear relationship with the mass flow rate.

Key words: smokepot, smoke, massconcentration, spatiotemporaldistributioncharacteristic, discretephase