TY - EJOU
AU - Liu, Jiali
AU - Yu, Mengge
AU - Chen, Dawei
AU - Yang, Zhigang
TI - A Study on the Reduction of the Aerodynamic Drag and Noise Generated By the Roof Air Conditioner of High-Speed Trains
T2 - Fluid Dynamics \& Materials Processing
PY - 2020
VL - 16
IS - 1
SN - 1555-2578
AB - 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 in terms of aerodynamic drag and
noise mitigation. However, compared to the design scheme with propulsion height of
0mm, the aerodynamic drag coefficient of the configuration with propulsion height of
190mm and flow-guide angle of 30° is slightly larger, while the aerodynamic noise is
obviously reduced. Thus, from the viewpoint of the aerodynamic drag and noise, the
design scheme with propulsion height of 190 mm and flow-guide angle of 30° is the
optimal configuration in the range of conditions examined in the present work.
KW - Aerodynamic drag
KW - aerodynamic noise
KW - roof air conditioner
KW - large eddy simulation
KW - acoustics analogy theory
DO - 10.32604/fdmp.2020.07658