A moving model test of a maglev train passing through tunnels: Effect of train speed and buffer structure on aerodynamic environment

Abstract

Maglev trains experience significant aerodynamic effects when passing through tunnels. A moving model test was conducted to explore the practical effects of speed reduction and entrance buffer structures on mitigating tunnel/maglev aerodynamic effects. It is found that both have an overall positive effect on mitigating the aerodynamic environment inside and outside the tunnel. Trains operating at 200 km/h show a 49.8% decrease in peak-to-peak pressure and a 50.7% decrease in transient pressure instability on inner walls compared to those at 280 km/h. Lower speeds resulted in a 65.6% decrease in amplitude and a 24.5% decrease in decay rate, both of which are parameters for exponential fittings of pressure peaks that decay naturally after the train leaves. The buffer structures result in a reduction of up to 25.7% in the maximum positive pressure and a 29.0% decrease in transient pressure instability. Additionally, a reduction in amplitude of up to 21.2% and a 32.2% increase in decay rate were observed with the use of buffer structures. Nevertheless, it is difficult to conclude direct correlations between the maximum pressure, peak-to-peak values, etc., and the speeds or buffer structures due to the complex wave propagation in tunnels. However, speed reduction and buffer structures are proven to be effective in reducing the micro-pressure wave levels with a simpler monotonic relationship.

Keywords

maglev train / tunnel / moving model test / buffer structure / micro-pressure wave

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