Abstract
Heads of narrow gauge trains, including various commuter railways and limited expresses, were classified in five types; (a) a bluff-nose model, (b) a rounded bluff-nose model, (c) a rounded wedge model, (d) a 3-D rounded wedge model and (e) a trapezoid sides model. Their aerodynamic drag was measured by a wind tunnel experiment. A result shows that a bluff-nose model has the largest aerodynamic drag while the 3-D rounded wedge model the smallest. To reduce the aerodynamic drag of the bluff-nose model, which is most widely used in Japan, we proposed an aerodynamic device, which is attached the top of the train head. A wind tunnel experiment shows that the device reduces the aerodynamic drag by 46 %. Flow visualization was also conducted to understand the flow structure around the trains.
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