Jiali Liu1, Mengge Yu2, *, Dawei Chen1, Zhigang Yang3
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.1, pp. 21-30, 2020, DOI:10.32604/fdmp.2020.07658
Abstract In order to investigate how the aerodynamic drag and noise produced by the
roof air conditioner of a high-speed train can be reduced, the related unsteady flow in the
near-field was computed using the method of large eddy simulation. In this way, the
aerodynamic source for noise generation has initially been determined. Then, the far-field
aerodynamic noise has been computed in the framework of the Lighthill’s acoustics
analogy theory. The propulsion height and flow-guide angle of the roof air conditioner
were set as the design variables. According to the computational results, a lower
propulsion height or flow-guide angle is beneficial… More >
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