Train fire analysis by dynamic fire simulation method

A fire accident of a passenger train from Tehran to Ahvaz has been numerically simulated. In this study, emission patterns, temperature distribution and the other parameters have been investigated after the start of the fire. The transient governing equations have been solved by Pyrosim software for different scenario based on mass fraction of products, unused fuel and other fire parameters. The results are compared with an actual case. The results showed that less than two minutes after the start of the fire, the conditions inside the wagon reached a critical situation in terms of temperature, smoke and visibility. To prevent the fire from spreading to other parts of the wagon, firefighting operations must be performed in less than four minutes.