摘 要：通过近场测量和气动一声学耦合仿真，发现除霜格栅啸叫源于拟序涡结构脱落引起的有规律压力脉动，表现为A计权声压仿真频谱出现峰值。将格栅叶片改为锯齿状可扰乱拟序涡演化，试验验证啸叫声得以有效消除。该研究可为预测除霜格栅啸叫和改进设计提供参考。
关键词：客车；除霜格栅；啸叫机理；涡结构
中图分类号：U463.85；U461.1 文献标志码：A DOI：10.15917/j.cnki.1006-3331.2025.05.011
Mechanism Exploration and Optimization of Whistling in Defrosting Grille of a Bus
SI Dongxian,PAN Yanan,SUN Bo,JI Xubei,LI Yongli
Abstract: Through near-field measurements and aerodynamic-acoustic coupled simulations,this paper -veals that the whistling noise from the defrosting grille originates from the periodic pressure fluctuations caused by the shedding of coherent vortex structures,which are manifested as peaks in the A-weighted sound pressure spectrum.Modifying the grille blades into a serrated shape disrupts the evolution of these coherent vortices,and the whistling noise is effectively eliminated through experimental validation.This re-search can provide a reference for predicting the whistling and improving the design of defrosting grilles.
Key words: bus; defrosting grille; whistling mechanism; vortex structure
