多孔自然通风器的风致噪声模拟分析

Analysis of the Wind-induced Noise of a Porous Ventilator used in Indoor Natural Ventilation based on CFD Simulation

针对某办公楼采用的多孔通风器装置,进行了常态风作用下的稳态流场模拟分析,获得通风器内部及其周围区域流场分布情况,通过宽带噪声计算分析风致噪声的原因并获得噪声源。在此基础上结合非稳态大涡模型和FW-H方程模拟声音的产生与传播,并通过谱分析得到室内关键区的风致总声压级和A计权声压级,从而对其风致噪声进行评价,指导工程设计。

A steady-state flow field simulation analysis under a normal wind speed was carried out for a porous ventilator unit,which is used in the natural ventilation design for an office building.And the flow distribution within and around the ventilator was accessed.Then the causes of the wind-induced noise were analyzed through the broadband noise calculation,and wind-induced noise sources were figured out.On this basis,the sound generation and transmission were simulated by the way of unsteady-state large-eddy simulation and the FW-H equation,and the overall sound pressure level and A-weighted sound pressure level in the room were obtained to evaluate the wind-induced noise,and it was useful to guide the design.