Keywords: high-speed train, tunnel, micro-pressure wave, train aerodynamics, tunnel portal, pressure-wave propagation, tunnel-simulation facility.

The entry of a high-speed train into a railway tunnel leads to a complicated system of pressure waves which may have a negative impact on both train and tunnel infrastructure. Therefore the study of pressure-wave generation and propagation mechanisms inside a tunnel and the influence of an extended tunnel portal on this phenomenon represents an important area of interest. A new test facility was built in Göttingen in the year 2010. It is a moving-model rig and enables one to investigate a realistic passage of the train through a tunnel. The first measurements of the pressure waves generated by a high-speed train entering a tunnel, which were done with the new facility, and their results are presented here. Furthermore, a hood acting as an extension of the tunnel portal is studied.

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