Numerical calculation of temperature distribution of lining based on standard fire curve and heat release rate

Abstract

Abstract: In order to find out the temperature distribution characteristics of the lining under fire, a one-dimensional numerical calculation method of heat transfer lining temperature was established based on the mathematical model of tunnel fire-lining radiative convective heat transfer. The HC standard fire curve and the fire condition of 30 MW fire heat release rate were calculated and analyzed. The results show that the maximum temperature of the standard fire curve is generally greater than that required by the current Chinese code. Using fire temperature as the boundary condition for the lining wall will significantly increase the temperature wad on the lining. The maximum temperature of the lining is 778 °C and 351 °C under the 2 hour HC fire curve and the 30 MW fire condition, respectively. The influence range and high temperature value of the lining inside the standard fire curve condition are significantly greater than those of the 30 MW fire condition.

Key words: tunnel lining, heat transfer methods, heat release rate, standard fire curves, temperature characteristics

Liu Qiulin1, 3, Zhang Chao2, Xu Zhisheng3, Tao Haowen1. Numerical calculation of temperature distribution of lining based on standard fire curve and heat release rate[J]. Fire Science and Technology, 2024, 43(9): 1298-1302.

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Numerical calculation of temperature distribution of lining based on standard fire curve and heat release rate

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