STUDY OF FIRE TEMPERATURE MODES IN HORIZONTAL CABLE TUNNELS DEPENDING ON PARAMETERS AND FIRE LOAD

Oleksandr NUIANZIN; Oleksandr IVANENKO; Vitalii STEPANENKO; Taras SAMCHENKO

Oleksandr NUIANZIN Cherkasy institute of Fire Safety named after Chornobyl Heroes of National University of Civil Protection of Ukraine
Oleksandr IVANENKO Cherkasy institute of Fire Safety named after Chornobyl Heroes of National University of Civil Protection of Ukraine
Vitalii STEPANENKO Cherkasy institute of Fire Safety named after Chornobyl Heroes of National University of Civil Protection of Ukraine
Taras SAMCHENKO Institute of public administration and research in civil protection

Keywords: cable tunnel, electrical networks, power consumption, switching, computing experiment, fire resistance

Abstract

Based on the results of the work, the dependences describing the maximum temperature inside the cable tunnel during a fire, the duration of a fire in a certain local area of the cable tunnel, and the time to reach the maximum temperature inside the cable tunnel during a fire were obtained from the fire load, the cross-sectional area of the tunnel, and the speed of movement of air masses inside.

In one of the CFD software complexes, a mathematical model of the cable tunnel, similar to the real one, was created. A computational experiment was conducted. Modeling, as a method of scientific research, makes it possible to conduct all the necessary experiments on determining the temperature regimes of fire in cable tunnels without performing materially expensive and time-consuming field experiments on models.

Based on the results of the computational experiment and field tests, adequacy criteria were calculated (Student's t-test, Cochran's Q-test, Fisher's F-criterion). Based on the analysis, the adequacy of the used mathematical models was investigated.

A full factorial experiment was designed and conducted. According to its results, regressions of the maximum temperature inside the cable tunnel during a fire, the duration of a fire in a certain local area of the cable tunnel, and the time of reaching the maximum temperature inside the cable tunnel during a fire were obtained.

The temperature regime of the fire in cable tunnels with different sizes, aerodynamic parameters and fire load was determined, as well as the dependence on the specified parameters of the temperature regime of the fire.