抄録
In order to grasp the flow around a simple shape train model running in a tunnel section, we manufactured an experimental train model with a scale of 1/62 on which a comb of total pressure tubes was mounted. We propelled the train model by the model launcher at a speed of 110 to 150 km/h and measured the flow velocity around the train model. We obtained the time history waveform of the flow velocity variation and flow velocity distribution in the radial direction. We also estimated the local friction coefficient from the flow velocity distribution by the Clauser method. We confirmed that the local friction coefficient obtained in the tunnel section is equivalent to that in the open section when the flow velocity outside the boundary layer is used as the reference velocity in the train fixed coordinate system.
