At the TSG measurements of the flow field around a high-speed train were conducted with two different setups using Particle Image Velocimetry. In the first setup the field of view was perpendicular to the train's moving direction to study the head wave, the boundary layer and the near wake, whereas the focus lies an detecting a pair of counter-rotating vortices, which induce the maximum loads on trackside objects. The flow structures can be visualised using the chosen measurement technique. The component of the flow velocity in the measurement plane showing the train's head wave can be quantified with a maximum velocity of about 7m/s for the train velocity of 30m/s. Furthermore the development of the train's boundary layer can be investigated in several planes with a distance of 3.75cm, although the most important component of the flow velocity inside the boundary layer is orthogonal to the measurement plane and therefore cannot be quantified. As the field of view doesn't cover the full width of the wake only one of the two counter-rotating vortices can be detected. However, because of the symmetry of the setup the second vortex is supposed to equal the detected one mirrored at the symmetry plane in the middle of the rail. The second setup is built to show the boundary layer of the train model near the tunnel entrance and flow structures occurring due to train-tunnel entry. The flow structures around the train head and the rear end of the model can be successfully detected and visualised. At the train's rear end no separation is apparent. The vortex, which is generated due to the entry of the train model into the tunnel, separates from the tunnel entrance, as soon as the train nose reaches the portal. The air displaced by the train inside the tunnel is pushed backwards through the tunnel entrance. The resulting stream tube is contracted due to the vortex, which may lead to a further increase in pressure inside the tunnel. Both measurements show satisfying results. The vortices and flow structures, which were meant to be investigated, can be detected, visualised and quantified very well. Therefore, the high-speed PIV-technique is suitable for the application at the TSG.
High-speed particle-image-velocimetry on a moving train model: Experimental study of the flow around an ICE3-model in the tunnel-simulation facility Göttingen
2013
11 Seiten, 9 Bilder, 6 Quellen
Aufsatz (Konferenz)
Englisch
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