Influence of Open and Closed Window on Fire Smoke Characteristics in Double-decker Trains

doi:10.3901/JME.2023.04.232

Abstract

Abstract: The window opening and closing state has a greater impact on train fires, and in existing studies, there are few studies on the smoke characteristics of double-decker trains. Based on the computational fluid dynamics theory(CFD), the fire numerical calculation model of the double-layer train is established, and the large eddy simulation method(LES) is used to numerically simulate the flow field in the vehicle. By setting parameters such as fire source position, fire source power, and train running speed unchanged, only changing the parameter of the window opening and closing state of the lower car of the double-decker train, studying the change of windows in different positions after a fire occurs during the train operation. The effect of the opening and closing state of the on the smoke characteristics of the upper and lower double-deck trains. Through research and analysis, it is found that opening the windows in different positions has a greater impact on the smoke characteristics in the car: Opening the window in front of the fire source causes the height of the smoke layer of the entire train of the double-decker train to increase, the CO concentration decreases, and the temperature of the smoke When it descends, the smoke in the carriage develops in a direction that is conducive to passenger escape. Opening the window behind the fire source only reduces the CO concentration and smoke temperature in the rear area of the cabin, and the height of the smoke layer increases. According to the research results, it provides a reference for the escape and evacuation design of double-deck trains.

Key words: double deck trains, fire, flue gas characteristics, window, numerical simulation

CLC Number:

TK51

SUN Yao, CAI Lu, QIN Deng, LI Tian, ZHANG Jiye. Influence of Open and Closed Window on Fire Smoke Characteristics in Double-decker Trains[J]. Journal of Mechanical Engineering, 2023, 59(4): 232-240.

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