Heat Release Rate Research Of High-Speed Trains

In recent years, the rapid development of China’s high-speed trains causes more and more attention and recognition. However, the high-speed trains are always crowded, sealed, and there are many electrical equipment and non-metallic materials in trains. Besides, internal and external pressure is produced when high-speed train running. Once a fire, the consequence is unimaginable, and it will cause a very serious loss of life and property. Therefore, the high-speed train fire safety work around the world is particularly valued. Many foreign countries have done a lot of work of fire performance for high-speed trains, including material testing. In addition, they develop a series of related technical requirements and industry standards. Our research and assessment for fire high-speed train are still in its infancy, and we have also developed a number of technical specifications with reference to foreign standards. However these specifications are not comprehensive enough. Therefore, carrying out high-speed train fire performance evaluation study has important significance.In this article, small-size material model and large-size material model have been tested using the cone calorimeter and the ISO 9705 standard burning laboratory. Then comparing the result of the experiment and simulation results of pyrosim software proves the validity and accuracy. Secondly, according to the standard ISO 9705, the high-speed train seats have been simulated and analyzed. It will provide a theoretical reference for the seat combustion test. Finally, to analysis train heat release rate (HRR) curve and smoke movement under various conditions, the pyrosim model of CRH2 high-speed trains based on the data of train materials tests have been constructed. In addition, it determines whether flashover occurred. The results provide an important basis for preparing contingency plans for high-speed trains, fire evacuation drills, as well as the selection, optimization, and assessment of the high-speed train materials. The results show that the fire on the seat causes flashover phenomenon, and ventilation makes the fire more exuberant after flashover occurred due to the entry of fresh air. While the fire on the floor doesn’t cause flashover phenomenon in the train, in which case the ventilation can reduce the smoke concentration and temperature to some extent, so it contributes to escape.