Explain the stall and surge of the DWT-1-15 axial flow roof fan

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Explain the stall and surge of the DWT-1-15 axial flow roof fan

Stall: It is a hydrodynamic phenomenon caused by the structural characteristics of the blade. For example, the rotational speed of the stall zone, the starting point of the outflow, and the vanishing point have their own laws, which are not affected by the volume and shape of the fan system.
Surge: It is a manifestation of the oscillation characteristics of the fan performance coupled with the pipeline device. Its basic characteristics such as amplitude and frequency are dominated by the volume of the fan piping system. The fluctuation of flow and pressure power is caused by unstable working conditions. However, experimental studies have shown that the occurrence of surge phenomenon is always closely related to the flow of airflow in the channel, and the increase of the angle of attack is also related to the decrease of flow. Therefore, there will be a rotational outflow in the unstable working condition where surge occurs.

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