Axial Fan Blade Design

The flow is axial at entry and exit.

Axial fan blade design.

Fig 3 shows the velocity diagram for the air flowing into the fan inlet and out of it outlet. These laws govern airflow pres sure capability and power required among many other parameters. The axiblade product range gets more out of the standard market footprint than any other axial fan. In this video we ll be demonstrating the aerodynamic design of an axial low pressure fan including a cfd simulation.

Axial flow fans 1 0 definition of axial fans an axial flow fan moves air or gas parallel. Blade design wingtip with certain versions also featuring innovative peripheral components such as guide vanes diffuser and flowgrid. The axial flow velocity increases from the fan hub to the tip. The inlet and outlet velocities of the air through the blades will be the same for axial fans and different for centrifugal fans v ᵢ and v ₒ.

The fan is designed to produce a pressure difference and hence force to cause a flow through the fan factors which determine the performance of the fan include the number and shape of the blades. S series sickle shaped metal blades sheet steel or die cast aluminum. First you create a new project choosing the ventilator design module. The fan design is complemented.

Low noise axial fan blade designs such as the sickle profile use a swept design and thin trailing edge to reduce pure tones in the sound spectrum and decrease vortex shedding to generate low wake turbulence. Blades that maximize the volumetric flow rate contribution of the outer radii i e. An axial fan is a type of fan that causes gas to flow through it in an axial direction parallel to the shaft about which the blades rotate. Fan laws set of laws that predict perfor mance changes if one or more parameters are changed from one fan or operating condition to another.

The shape of your blades and the direction they travel will define the performance characteristics of your fan. Axial flow fan design procedures depend largely on the work. Axial flow fan impellers will also be subject to centrifugal forces and thus the various elements will be stressed. The structural design of the fan blade was performed by one of the project partners and does not form part of this paper.

The resulting blade geometry generates a given volumetric flow rate at the minimum fan tip speed. Carolus universität siegen institut für fluid und thermodynamik n09 085 a2 universität siegen institut für fluid und thermodynamik 1 1 axial cascade blade element be 1 2 actual vs. 7 8 stressing of axial impellers 7 8 1 introduction. Insert the design point of the fan.

As in most cases the blades are cantilevered and only supported at the end adjacent to the hub fluctuating stresses are more important. The design point is defined by volume flow rate total pressure rise and rotational speed.