The effect of bogie side components on the aerodynamic noise generation of the leading car of a high-speed train

Abstract

This study investigates numerically the effects of bogie side component positions on the flow behaviour and aerodynamic noise of high-speed trains. To reduce simulation cost, the model size and flow speed are scaled down, while ensuring that the Reynolds number remains within a range conducive to similar flow behaviour. The Delayed Detached Eddy Simulation method with Spalart-Allmaras turbulence model is adopted for flow simulations. The time histories of the wall pressures are employed to predict the far field noise using the Ffowcs Williams and Hawkings equation. Analysis of pressure fluctuations on the bogie and car body show that, as the bogie side components protrude further into the flow, the area exhibiting strong noise source on the bogie surfaces increases, while it decreases on the rear walls of the bogie cavity. The aeroacoustic results reveal that the radiated noise rises at higher frequencies and drops below 160 Hz for the bogie and 300 Hz for the car body as the side components protrude further. When the bogie side components are shifted outwards by 400 mm, the overall unweighted sound pressure reduces by 2 dB but the A-weighted level increases by 2.5 dB. The total A-weighted sound power level is increased by 2.9 dB compared to the reference case.

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Identifiers

ORCID for David Thompson: orcid.org/0000-0002-7964-5906

ORCID for Zhiwei Hu: orcid.org/0000-0001-6737-4363

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