Electromagnetic-fluid-temperature coupled field simulation on cable shaft in high-rise buildings

Once the shaft cable catches fire, the burning rate is generally about three times that of the horizontal cable, and the “chimney effect” will make the fire burn fiercely and spread quickly. Based on the governing equations of electromagnetic field, temperature field and fluid field, combined with the geometric model of the actual cable shaft, a multi-physics simulation model of the cable shaft is established in this paper. Through the simulation analysis of the transient electromagnetic-fluid-temperature field, the temperature change of the cable is obtained: in a relatively confined space, the temperature increases with the height. By changing the plugging material parameters, the influence of different plugging materials on the electromagnetic-fluid-temperature field of cable under normal operation is simulated. It is concluded that fireproof material has certain influence on heat dissipation of cable shaft. The temperature of intermediate partitions and cables blocked by fire-resistant materials has increased significantly. The maximum temperature is 0.66°C higher than when no fireproof material is used.