Centrifugal Fan Blade Design

Forward blade backward blade and radial blade.

Centrifugal fan blade design.

A backward curved centrifugal fan is characterised by its cylindrical shape several large curved blades and a conical inlet nozzle. As the fan rotates a pressure difference is created on the impeller blades. 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. The impeller design will depend on the aerodynamic duty and the operating conditions.

As shown in the animated figure the hub turns on a driveshaft mounted in bearings in the fan housing. 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. The characteristic curve of three kinds of centrifugal fan is shown in figure 2 15. Manufacturing industries of fans and blowers seldom followed optimum design solution for individual fan blower.

F wheel curved forward blades. Generally centrifugal fans have three types of blade. The design of the lift fan system is subject to meet payload machinery spacing and ruggedness requirements. 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.

Mostly their design and fabrication is based. In a centrifugal fan the air flows is in a radial direction relative to the shaft. The centrifugal fan has a drum shape composed of a number of fan blades mounted around a hub. A heavy duty air cushion vehicle usually employs centrifugal lift fans to pressurize the air cushion and power the steering thruster.

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. Centrifugal fans can be classified by their wheel like. 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. In the example shown below the fan rotates in a clockwise direction.

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.