Which type of fan creates a smooth helical flow pattern that increases static pressure?

The vane-axial fan is designed to create a smooth helical flow pattern, which significantly enhances its ability to increase static pressure within a system. This type of fan incorporates vanes or blades that are angled in such a way as to guide the airflow efficiently while minimizing turbulence. The helical flow pattern generated by this design allows for a consistent and steady increase in pressure, making it ideal for applications requiring high static pressure and controlled air movement.

In contrast, axial-flow fans and axial-flow blowers primarily move air in a straight line along the axis of the fan, and while they are effective at moving large volumes of air, they do not generate the same level of static pressure as a vane-axial fan. Centrifugal fans, while they can also enhance static pressure, create a different flow pattern that is radial rather than helical, resulting in distinct characteristics and applications compared to a vane-axial fan. Therefore, the unique design of the vane-axial fan is what makes it suitable for applications requiring both a smooth airflow and increased static pressure.