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3.2.2通风声通风声大部分是由风扇和通风道产生的噪声。这种通风噪声的原因主要有以下2种:①不连续噪声…是由叶片旋转引起的叶片通风频率及其倍声构成的,其原因是旋转叶片受到一种空气压力的冲击,所以也称为旋转噪声。另外,由于风扇叶片与静止加强筋的干扰,以及定子与转子的通风沟声的互相干扰,致使这种噪声中也含有汽笛声。②宽频带噪声…在旋转叶片的背面或腹面,从气流的分离中产生涡流是形成噪声的主要原因,所以叫
3.2.2 Ventilation The majority of the ventilation is the noise generated by fans and ventilation ducts. There are two main causes of this ventilation noise: ① Discontinuous noise ... is caused by the vane ventilation frequency and its doubled sound caused by the rotation of the vane. The reason is that the rotary vane is subjected to an impact of air pressure and is also called Rotate the noise. In addition, this noise also contains whistle due to the interference of the fan blades with the static reinforcement and the mutual interference of the stator and rotor ventilation grooves. Broad band noise ... The vortex on the back or ventral surface of the rotating blade, which is caused by the separation of the airflow, is the main cause of the noise, so it is called