Quarterly Report of RTRI
Online ISSN : 1880-1765
Print ISSN : 0033-9008
ISSN-L : 0033-9008
PAPERS
Wind Tunnel Experiments on Reducing Separated Flow Region Around Front Ends of Vehicles on Meter-Gauge Railway Lines
Yutaka SAKUMAAtsushi IDO
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2009 Volume 50 Issue 1 Pages 20-25

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Abstract

Separated flow around the front end of a 1/5-scale vehicle model in a large-scale wind tunnel was examined through flow visualization using tufts and measurement of surface pressure distribution and aerodynamic drag. Various sizes and shapes of front-end edges for the vehicle were used in the experiments. The results indicated that shapes with edges rounded as elliptic arcs effectively reduce the separated flow, and that they can be used as a design guide for the front ends of vehicles on meter-gauge railway lines. The advantage of the experiments on separated flow in the large-scale wind tunnel was clearly shown by comparing the results with those previously obtained from a small-scale wind tunnel using a 1/20-scale model.

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© 2009 by Railway Technical Research Institute
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