Numerical study on the aerodynamic and acoustic scale effects for high-speed train body and pantograph

Li, Tian; Qin, Deng; Zhou, Ning; Zhang, Jiye; Zhang, Weihua

doi:10.1016/j.apacoust.2022.108886

Cited by 16 publications

(4 citation statements)

References 24 publications

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Section: Discussionmentioning

confidence: 79%

“…According to the related study, when the whole vehicle is the noise source, the far-field aerodynamic noise starts from the first bogie and varies steadily to the last bogie, while the noise at the front and rear of the vehicle decreases significantly. 16 The change rule of SPL at different speeds in the figure is the same as the conclusion of the literature. For the 1/3-octave A-weighted spectrum, SPL change of the scale-down model in the literature 23 is consistent with the results of this paper, which means that it rises first and then slowly decreases, and the main frequencies are all 200−5000 Hz.…”

Section: Discussionmentioning

confidence: 79%

“…Li et al 15 studied near-field quadrupole noise sources and far-field aerodynamic noise with the aid of a scale-down model of the head car of a high-speed train, and found that turbulence around the head car has multi-scale vortex characteristics separated from the geometry and that volumetric dipole sources are the main source of near-field quadrupole noise. Li et al 7,16 compared and analyzed the aerodynamics, flow field characteristics, surface pressure and far-field noise of pantograph models of different scales. The results showed that the far-field aerodynamic noise of pantographs was less affected by the scale of the model, but as the scale decreased, the energy concentration range of the radiated noise changed from low to medium-high frequency.…”

Section: Introductionmentioning

confidence: 99%

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Numerical simulation and prediction of aerodynamic noise of high-speed trains

Liu,

Zhang,

2023

Noise & Vibration Worldwide

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In order to improve the efficiency of high-speed train aerodynamic noise analysis and provide a feasible method for aerodynamic noise prediction, the aerodynamic noise and its influencing factors are analyzed from the perspective of the total energy (sound power) radiated to the far field per unit time by the aerodynamic fundamental noise sources (monopole, dipole and quadrupole sources). A full-scale and a 1:8 scale-down computational fluid dynamics model of a high-speed train are established. The far-field sound pressure level at several receivers and velocities is calculated by using the transient large eddy simulation and the FW-H equation. The numerical simulation results are used to predict the aerodynamic noise under specified working conditions. The research work can achieve the prediction of aerodynamic noise at other velocities using noise data at known velocities on the same noise source case, as well as the prediction of aerodynamic noise of full-scale model using data of scale-down model, and is applicable to either bogies as local noise sources or the complete vehicle as a noise source. The maximum error between the prediction and simulation result is 0.33 dBA under various working conditions, which meets the engineering calculation requirements.

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Section: Discussionmentioning

confidence: 79%

Section: Discussionmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

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Numerical simulation and prediction of aerodynamic noise of high-speed trains

Liu,

Zhang,

2023

Noise & Vibration Worldwide

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“…A method combining Reynolds-averaged Navier-Stokes (RANS) and large eddy simulation (LES) is widely used in the aerodynamic calculation of high-speed trains [14,15]. It can obtain high-precision flow field results and meet the computational efficiency requirements, which is called the detached eddy simulation (DES) method.…”

Section: Methodsmentioning

confidence: 99%

Numerical Comparison in Aerodynamic Drag and Noise of High-Speed Pantographs with or without Platform Sinking

Dong

2023

Applied Sciences

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Flat roofs and platform sinking are two common installation configurations for high-speed pantographs. The cavity formed by the platform sinking is a potential source of aerodynamic drag and noise. In this paper, the shape of the rectangular cavity is optimized, and the aerodynamic performance of the high-speed pantograph with or without platform sinking is compared and discussed based on the optimized cavity results. The flow field and sound propagation are predicted by the improved delayed detached eddy simulation (IDDES) method and the FW-H equation. The results show that the rectangular cavity produces the largest aerodynamic drag and radiation noise. The upstream, downstream, and bottom surfaces of the cavity can be optimized by rounded and sloped edges to reduce aerodynamic drag and noise. The unstable shear flow and recirculation zone formed by flow separation and reattachment can be reduced by modifying the upstream and downstream surfaces of the cavity. In addition, the vortex in front of the downstream surface of the cavity can be reduced or even eliminated by modifying the bottom surface. When the upstream and downstream surfaces of the cavity are rounded and the bottom surface is sloped (R/H = 0.8), the aerodynamic performance of the cavity is better. Compared with the pantograph installed on the flat roof, the aerodynamic drag and noise of the pantograph with platform sinking are significantly reduced due to the shielding of the lower structure by the cavity, and the total drag and noise are reduced by 5.22% and 1.45 dBA, respectively.

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