Abstract
The quadrupole aerodynamic noise is a difficult problem in numerical simulation of the aerodynamic noise. The Kirchhoff-Ffowcs Williams and Hawkings (K-FWH) equation method and the three-dimensional compressible Large Eddy Simulation (LES) method are adopted in this manuscript for aerodynamic noise accuracy simulation of 600km/h high-speed train. The influence of different distributions of penetrable integral surfaces on the results of far-field aerodynamic noise is discussed. The optimum combination form of penetrable integral surfaces is obtained. The aerodynamic noise of high-speed train considering quadrupole can be calculated efficiently and accurately by using the upstream body surface and wake area penetrable integral surface as sound source surface. The wake area penetrable integral surface should contain the main vorticity structure of the wake as far as possible and the surface vorticity amplitude should be insignificant. The contribution rate of the dipole and quadrupole to the total aerodynamic noise energy of high-speed train is different. The aerodynamic noise energy of the upstream measurement points is mainly dipole aerodynamic noise energy, while that of the downstream measurement points is mainly dipole and quadrupole noise energy. The method proposed in this manuscript is of great significance in the aerodynamic noise numerical simulation of 600km/h high-speed train.
Highlights
New technologies applied to China’s high-speed trains allows operational speeds up to 400 km/h, which up to 600 km/h are foreseen in the near future with the current research ongoing
When the speed of high-speed train is less than 350 km/h, the dipole aerodynamic noise is the main noise source, and the quadrupole aerodynamic noise can be neglected [1]–[11]
In order to clarify the influence of the position of the penetrable integral surface on the aerodynamic noise results of high-speed trains in the far field, the A-weighted sound pressure levels of the case 1 of the penetrable integral surface 1-5 are calculated by Kirchhoff-Ffowcs Williams and Hawkings (K-FWH) equation at 16 measurement points
Summary
New technologies applied to China’s high-speed trains allows operational speeds up to 400 km/h, which up to 600 km/h are foreseen in the near future with the current research ongoing. In order to clarify the influence of the position of the penetrable integral surface on the aerodynamic noise results of high-speed trains in the far field, the A-weighted sound pressure levels of the case 1 of the penetrable integral surface 1-5 are calculated by K-FWH equation at 16 measurement points. At the measurement point 1-8, the average values of the A-weighted sound pressure level of the penetrable integral surface 1-5 are about 4.0dB(A), 2.3dB(A), 1.2dB(A), 1.3dB(A) and −1.5dB(A) larger than that of high-speed train, respectively. The sound pressure level of the aerodynamic noise radiated from the penetrable integral surface at the measurement point of the wake region should be significantly higher than that radiated from the train. The recommended penetrable integral surface length in the wake area should be larger than 12 times the vehicle height
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