Abstract:

When a fire occurs in a high-speed train compartment, this can lead to the rupture of windows, thus forming side openings, which significantly affects the fire combustion state and temperature distribution. Therefore, a combination of 1:8 scaled model experiment and numerical simulation is used to study the effect of different opening positions on the fire evolution in the compartment, and the longitudinal decay law of the temperature inside the high-speed train compartment is quantitatively investigated under the joint influence of the opening position and the power of the fire source. The results show that: with the increase of the fire source power at each opening position, the fire evolution inside the compartment and the smoke/flame at the opening go through the stage of full combustion of the fuel inside the compartment, the stage of anoxic combustion, and the stage of continuous overflow in turn; the influence of the fire source power and the opening position on the flame moving speed inside the compartment is discussed, and a prediction formula for the flame moving speed is put forward; the maximum temperature inside the compartment and the temperatures at the left and right sides of the opening are investigated, and the longitudinal attenuation law for the temperature inside the high-speed train is established. The maximum temperature in the compartment and the temperature decay law of the left and right sides of the opening are studied, and the temperature decay prediction model of the left and right sides of the opening is established when different openings of the high-speed train compartment fire, and the results of the research have certain reference value for the prevention and mitigation of the high-speed train compartment fire.

Key words: high-speed train fires, flame evolution, spillover of opening fire, flame travel speed, opening position, heat release rate, temperature distribution