Abstract: Using PyroSim, a large-space model of the litter layer on the surface of the Korean pine forest was established, and the burning temperature, heat release rate, and smoke concentration of the litter layer were numerically simulated. The litter layer on the surface of the Korean pine forest was tested to explore the burning and spreading process of the litter layer on the surface of the Korean pine forest. The simulation results show that the temperature of litter on the surface of the Korean pine forest is about 100～490 ℃ during burning. With the increase of height, the range of temperature decrease gradually becomes smoother from violent; when burning for 150 s, the heat release rate reaches 7.5105 kW, and there is the upward trend; the CO2 volume, concentration in the flue gas reaches about 8%～10%; when the flowing wind speed in the fire site is 2 m/s, the flue gas concentration drops by about 65%. The experimental results show that the burning temperature curves of litters are similar to the simulation results, and the PyroSim software can reasonably simulate the burning process and development trend of the surface litters of Korean pine forest.

Key words: Korean pine, litter layer of forest, temperature, HRR, numerical simulation