Abstract
At the paper results of study of air distribution at elongated railway tunnels from piston effect of trains are represented. Simulation was carried out on the example of movement of freight train with length of 1 km at tunnels with length 3 and 6 km by numerical experiment in ANSYS Fluent software pack. As a result of the study, dependences of air pressure to front and rear surfaces of train on its position in the tunnel and on value of aerodynamic resistance of the gap between train and wall of the tunnel are obtained. The results have been used for development of quasi-dynamic model of piston effect of trains for solution of static air distribution problems on network models. Comparison of air discharge at various tunnel cross-sections obtained using ANSYS Fluent pack and network model shows satisfied repeatability. In that case, time of problem solution for a tunnel with length 3km on network model in 4·105 lower than on volume model. It has important practical meaning for multivariant calculations during designing of ventilation systems at railway tunnels.
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