通风外窗气流和声波特性研究

Characteristics of air flow and sound wave through ventilation windows

基于气动噪声分析理论,建立了物理模型,模拟分析了不同窗缝进风速度下窗体及室内空间的噪声声功率级分布。结果表明,对于典型的窗体结构,风速小于5m/s时进气噪声可忽略;风速大于20m/s时,会在射流流动分离区附近(包括上游)产生声功率级大于60dB的噪声源,在下游较宽广区域产生大于40dB的气动噪声声源;风速大于30m/s时,会在下游宽广区域产生大于60dB的气动噪声源,局部噪声接近80dB;对窗户进行一定改造,可消除噪声。

Based on the aerodynamical noise theory,establishes a physical model,and simulates and analyses the noise sound power level distribution of the window and indoor space at different velocities of air flow through cracks around the window.The results show that for a typical window,the aerodynamical noise can be neglected if the air velocity is less than 5 m/s;when the air velocity is larger than 20 m/s,the noise source larger than 60 dB would appear in the jet separation zone,and the noise source larger than 40 dB would appear in broader downstream zone;when the air velocity is larger than 30 m/s,the noise larger than 60 dB would appear in broader downstream zone,and local noise approaches 80 dB;the retrofit to the windows structure will decrease this aerodynamical noise.