G0500701 Wind Tunnel Tests on the Unsteady Underfloor Flow of Railway Vehicle

Abstract

Wind tunnel tests of flows around a railway vehicle were conducted to investigate unsteady vehicle underfloor flows. Numerical simulations conducted in the past indicated that pressure fluctuations observed on the side surface of the train were caused by these underfloor flows, which could cause flow-induced vibrations of high-speed trains affecting their riding comfort. The object of this research is to execute an experiment to validate the numerical simulation. The results of this study demonstrated that large lateral velocity fluctuations were generated in the underfloor of a train and that the previous numerical simulations were valid.