Blower Fan Blade Design

Fig 3 shows the velocity diagram for the air flowing into the fan inlet and out of it outlet.

Blower fan blade design.

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. Fan efficiencies differ from design to design and also by types. The blades of these fans are or end up radially to the fan s shaft. A fair running static efficiency is 50 70 percent for both the.

Comparing forward curved blades backward curved blades and straight blades for a blower impeller. Typical ranges of fan efficiencies are given in table 5 2. 01 april 2011 the rather sharply rising static pressure curve of the radial blade centrifugal fan allows for small changes in volume as the resistance of the system changes considerably. Type 4 backward inclined blower wheels are available with a flat blade design.

As each industrial air moving system has it s own particular design and system effects it would be impossible to predict the infinite amount of all possible system effects or phenomenon that may occur in a particular application. Process design of fans and blowers project standards and specifications page 7 of 26 rev. The shape of your blades and the direction they travel will define the performance characteristics of your fan. Blade design parameters are defined with asd grid a a 3d view.

C a close up view at the trailing edge region of the deformed blade. Fans blowers and compressors see table 5 1. 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. B a chordwise view with a deformed blade.

The flow is axial at entry and exit. Fan blower design selection industrial air flow design principles for fan blower applications. Radial bladed fans include a simple paddle blade with effect up to 65 shrouded radial blade with effect up to 72 and radial tip fans yielding efficiency up to 75. 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.

Such a fan is also called a blower fan biscuit blower citation needed or squirrel cage fan because it looks like a hamster wheel. The design requirements called for improving the efficiency of lift fan while meeting the set design criteria for the output fluid power delivered by the impeller. 5 2 fan types fan and blower selection depends on the volume flow rate pressure type of material handled space limitations and efficiency. These wheel types are commonly used for general ventilation forced cooling at higher pressures and in dust collection systems where the fan is on the clean air side of the dust collector.