Abstract
Model shooting experiments and numerical simulations are conducted to study the unsteady flow generated when a train enters a single-track tunnel. Model experiments for two varieties of rounded corners of the fronts of circular cylindrical trains entering a circular tube are carried out to visualize the unsteady flow by using oil mist and a high-speed camera. To calculate the unsteady flow, two dimensional numerical analysis are solved with a CFD software, Fluent. Model experiment results show that the pressure waves in the tunnel and the unsteady flows emitted from the tunnel entrance are considerably different between square- and round-ended trains. Numerical simulation results are compared with model experiment ones on the flow field around the train and then the agreement between them is found to be qualitatively good.
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