STUDY OF TEMPERATURE FIRE MODES IN CABLE TUNNELS WITH DIFFERENT PARAMETERS
Enclosure structures of cable tunnels are typically made of reinforced concrete. To determine their limit of fire resistance, a standard temperature mode of fire is used.
The fire in cable tunnels creates a special temperature mode, which differs from the standard one. This is explained by that the cable tunnels differ in design, fire load, aerodynamic and other parameters. A result of incorrect determining the limit of fire resistance for the building structures of cable tunnels might be their collapse at fire. Thus, studying the temperature mode of the fire is an important task.
Modelling, as a method of scientific research, makes it possible, without performing costly and labor-intensive field experiments on models, to conduct all necessary experiments to determine the temperature modes of fire in cable tunnels. The purpose of the research of this work is to determine the temperature mode of fire in a cable tunnel depending on its shape, size and fire load.
To take into account the specificity of the heterogeneity of the material from which the cable lines are made, as well as the conditions of conductive heat transfer (thermal conductivity in the solid material), the cable lines are given as a multi-component material. Polyvinyl chloride is bonded to the insulation of wires and copper from which cables are made. In addition, it is considered that the insulation material burns out. The specified parameter is given due to the bulk density and the linear burning rate.
In one of the CFD software systems computer models of cable tunnels were created. Computational experiments were carried out and temperature modes of fire in tunnels with different parameters were determined.
In this paper, further development of the use of computational experiments for the study of heat and mass transfer processes in fires in cable tunnels.