Why does the fan make noise when the wind pressure is low?
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When our axial flow fan is not in use, the wind pressure drops to over 30 kPa, and there is a dull humming sound inside the fan. As the pressure further decreases to around 20 kPa or 10 kPa, the noise disappears. What is the principle behind this?
I’m not sure if it’s related to the rotational speed; if so, it should be a vibration phenomenon within the rotor’s critical speed range.
The rotation speed remained stable at the rated speed, with no changes.
This is caused by the blades of the axial flow fan; the greater the pressure difference, the louder the noise, and the higher the rotation speed, the louder the noise as well—caused by blade vibration
j reduces the wind pressure; if the rotational speed remains unchanged, it is necessary to shut down the inlet blades, as changes in the inlet airflow can also lead to resonance or surge phenomena
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