论文标题
隔离离心风扇出口处的音调噪声源的数值和实验研究
Numerical and experimental study of tonal noise sources at the outlet of an isolated centrifugal fan
论文作者
论文摘要
在这项研究中，使用不稳定的雷诺平均纳维尔 - 斯托克斯（URAN）方程研究了由孤立离心风扇产生的音调噪声。这种类型的风扇用于通风系统。随着风扇在系统中传播音调噪音，它可能会严重影响居住在建筑物中的人们的生活质量。我们的模拟表明，湍流动能（TKE）围绕旋转轴不均匀。在刀片的压力侧的裹尸布附近存在大型TKE。它是由循环流引起的。此外，最大的TKE的位置在叶片之间定期变化。该周期对应于风扇旋转周期的大约4倍，在声学测量中也发现。刀片传递频率处的音调噪声的大小与实验数据非常吻合。通过分析壁压波动，发现具有较大TKE的循环流动区是音调噪声的主要来源。
In this study, tonal noise produced by an isolated centrifugal fan is investigated using unsteady Reynolds-averaged Navier-Stokes (URANS) equations. This type of fans is used in ventilation systems. As the fan propagates tonal noise in the system, it can severely affect the life quality of people that reside in the buildings. Our simulation shows that turbulence kinetic energy (TKE) is unevenly distributed around the rotation axis. Large TKE exists near the shroud at the pressure sides of the blades. It is caused by the recirculating flow. Moreover, the position of the largest TKE periodically varies among the blades. The period corresponds to approximately 4 times the fan rotation period, it was also found in acoustic measurements. The magnitude of the tonal noise at the blade passing frequencies agrees well with experimental data. By analyzing the wall-pressure fluctuations, it is found that the recirculating flow regions with large TKE are dominant sources of the tonal noise.
