Centrifugal Fan Blade Design

The centrifugal fan has a drum shape composed of a number of fan blades mounted around a hub.

Centrifugal fan blade design.

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. As the fan rotates a pressure difference is created on the impeller blades. As shown in the animated figure the hub turns on a driveshaft mounted in bearings in the fan housing. Mostly their design and fabrication is based.

A backward curved centrifugal fan is characterised by its cylindrical shape several large curved blades and a conical inlet nozzle. It does not calculate a fan s mechanical efficiency. Centrifugal fans can be classified by their wheel like. 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.

Axial centrifugal blade design this calculation option determines the airflow through impeller blades. Generally centrifugal fans have three types of blade. Forward blade backward blade and radial blade. The characteristic curve of three kinds of centrifugal fan is shown in figure 2 15.

The centrifugal fans impeller have five basic blade shapes and a number of impeller configurations i e dwdi double width double inlet or swsi single width single inlet. Manufacturing industries of fans and blowers seldom followed optimum design solution for individual fan blower. In a centrifugal fan the air flows is in a radial direction relative to the shaft. 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.

F wheel curved forward blades. A heavy duty air cushion vehicle usually employs centrifugal lift fans to pressurize the air cushion and power the steering thruster. 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.

The impeller design will depend on the aerodynamic duty and the operating conditions.