Centrifugal Fan Blade Design

The design of the lift fan system is subject to meet payload machinery spacing and ruggedness requirements.

Centrifugal fan blade design.

The name centrifugal fan is derived from the direction of flow and how the air exits the fan impeller radially from the outer circumference of the fan. As shown in the animated figure the hub turns on a driveshaft mounted in bearings in the fan housing. In a centrifugal fan the air flows is in a radial direction relative to the shaft. In order to improve the airflow efficiency of a fan you need to minimise the losses lˢ lᶠ lᵉ and to do this you need to optimise the size and shape of the its blades.

Manufacturing industries of fans and blowers seldom followed optimum design solution for individual fan blower. Mostly their design and fabrication is based. Forward blade backward blade and radial blade. Generally centrifugal fans have three types of blade.

A wide range of geometric tools and interactive charts allows users to configure the centrifugal radial or compressor s blades main blades and dependent independent splitter blades easily and in a short time of time. Axial centrifugal blade design this calculation option determines the airflow through impeller blades. As the fan rotates a pressure difference is created on the impeller blades. In the example shown below the fan rotates in a clockwise direction.

The impeller design will depend on the aerodynamic duty and the operating conditions. It does not calculate a fan s mechanical efficiency. The axstream s centrifugal compressor fan profiler and blade design software module is used to create and edit 3d airfoils for full or partial channel length. In addition because the diameter of a large centrifugal fan s impeller can be up to 3 4 meters its blades are generally two dimensional not twisted blades 10 11 in order to reduce.

Though centrifugal fans have been developed as highly efficient machines design is still based on various empirical and semi empirical rules proposed by fan designers. Centrifugal fans can be classified by their wheel like. The centrifugal fan has a drum shape composed of a number of fan blades mounted around a hub. A backward curved centrifugal fan is characterised by its cylindrical shape several large curved blades and a conical inlet nozzle.

The characteristic curve of three kinds of centrifugal fan is shown in figure 2 15.