Research on the Aerodynamic Noise Mechanism and Noise Reduction of SUV Roof Hollow Spoiler
The development of a hollow spoiler not only focuses on aerodynamic drag performance and pollutant management performance,but also on achieving aerodynamic noise and low noise performance.The aerodynamic noise characteristics of the hollow spoiler under good wind resistance performance and pollutant management performance condition is studied.The IDDES turbulence model for unsteady numerical simulation of the hollow spoiler is adopted,and the distribution characteristics of the unsteady flow field and the spectral distribution law of the measurement points are obtained.The results indicate that there is a narrowband noise with a main frequency of 510 Hz and a main frequency amplitude of 112.8 dBA at the rear windshield.The use of unsteady aerodynamic noise numerical analysis methods reveals that the spoiler spacer is the main component causing the shedding of the narrow band frequency of the Karman's vortex street.At the same time,the wind tunnel test method is used to verify the good consistency between the sound pressure level spectrum of the wind tunnel test and the simulation.In addition,after optimizing the shape of the spoiler rib,the narrowband main frequency at the measurement point disappears,and the narrowband main frequency amplitude and total sound pressure level at the measurement point decrease by 39.7 dBA and 27.1 dBA,respectively,achieving the best noise reduction effect.The wind noise reduction methods provides an effective simulation method for low noise optimization design of the hollow spoiler,which can effectively and quickly guide engineering applications.
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