Using horizontal sonic crystals to reduce the aeroacoustic signature of a simplified ICE3 train model
Artikel i vetenskaplig tidskrift, 2020

The design of noise barriers for high-speed trains is challenging due to the flow interaction between the train body and barriers. A failed design could affect the flow that in turn introduces additional aerodynamic loads to the train and generates extra noise. This study is the first investigation to numerically explore the detailed effects of noise barriers on high-speed trains. In particular, horizontal sonic crystals are compared to vertical, closed at the ground barriers in order to investigate the detailed effects of different noise screens on high-speed trains. The compressible IDDES is used to simulate the flow. The focus of this study is twofold. The first is to test if an alternative barrier typology can effectively reduce the noise signature, without having an impact on the train’s aerodynamic performance. The second is to explore the connection between the near-field velocity fluctuations and the far-field noise. A few specific tonal frequency components have been commonly reported but not clearly explained in the literature. It is unclear if the specific tonal components are less dependent on the Reynolds numbers, although, in general, energetic flow structures are dependent on inflow speeds. Concerning the noise reduction, the results show that the sonic crystal barrier case has a significantly better performance. A modal analysis is used to explore the causes of the tonal peaks and the association of the underbody swirling vortices to the far-field noise is described.

Författare

Guglielmo Minelli

Chalmers, Mekanik och maritima vetenskaper, Strömningslära

Huadong Yao

Chalmers, Mekanik och maritima vetenskaper, Strömningslära

Niklas Andersson

Chalmers, Mekanik och maritima vetenskaper, Strömningslära

Daniel Lindblad

Chalmers, Mekanik och maritima vetenskaper, Strömningslära

Jens Forssén

Chalmers, Arkitektur och samhällsbyggnadsteknik, Teknisk akustik

Patrik Höstmad

Chalmers, Arkitektur och samhällsbyggnadsteknik, Teknisk akustik

Sinisa Krajnovic

Chalmers, Mekanik och maritima vetenskaper, Strömningslära

Applied Acoustics

0003-682X (ISSN)

Vol. 172 15

Computation of aeroacoustic sources and sound propagation for urban challenges

Chalmers, 2019-01-01 -- .

Computation of aeroacoustic sources and sound propagation for urban challenges, part 2

Chalmers, 2020-01-01 -- .

Styrkeområden

Transport

Ämneskategorier

Rymd- och flygteknik

Teknisk mekanik

Strömningsmekanik och akustik

Mer information

Skapat

2020-09-04