Cross Flow Fan Design

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Cross flow fan design. The air intake to a mixed flow fan is in an axial direction where it is picked up by hybrid design impeller blades with axial and radial elements that deflect the air outwards at a diagonal angle in the region of 45 o. Axial propeller fans are more suited for applications with lower volumes and pressures. Crossflow wheels move air that passes through the blades. The ac cross flow fan features transverse airflow that passes directly through the fan twice rather than through an inlet.

Nevertheless the dominant feature of a cross flow fan and to a large extent its vertical axis wind turbine counterpart lies in the inherent unsteady non uniform aerodynamics of the rotor. Dc cross flow fans. The cross flow fan consists of a drum like rotor with forward curved blades encased within housing walls as shown in fig. The passage of blades through the vortex core the reversal of flow direction.

A tangential fan consists of a long cylindrical impeller of a similar construction to forward curved impeller. Centrifugal fans with forwarded blades are suited for application with higher air flow volumes and pressures. This choice of parameters has proved to be effective in a systematic series of experimental tests aimed at investigating directions for design improvement. The pressure head of different types of fans with equal periphery speed of the wheel are compared in the capacity diagram below.

The name crossflow blower provides a hint to how the air enters and exits the fan.