Simulation Analysis of Flow Field Structure and Aerodynamic Noise Characteristics in Key Areas of High Speed Trains
By creating a numerical model of a three-car train incorporating pantographs and bogies,the carbody flow field was calculated using the detached-eddy model.The study analyzed the source intensity on the carbody surface and the propagation of far-field aerodynamic noise by employing the broadband noise source model and the FW-H equation.Key findings from the study include:(1)The flow structure around the carbody of high speed train relates closely to the noise source locations;(2)Primary noise sources are identified at the car head,car rear end,pantograph,and bogie areas;(3)The sound power on the carbody surface escalates as the vehicle speed increases;(4)The intensity of aerodynamic noise source relies significantly on the interaction between airflow and train components.The highest surface sound power belongs to the head car bogie at end No.1.The sound power on the bogie surface decreases as longitudinal distance increases.
high speed trainFW-H equationdetached-eddy simulationflow field structureaerodynamic noise
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