Blower Fan Blade Design

B a chordwise view with a deformed blade.

Blower fan 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. The shape of your blades and the direction they travel will define the performance characteristics of your fan. Typical ranges of fan efficiencies are given in table 5 2. Process design of fans and blowers project standards and specifications page 7 of 26 rev.

Centrifugal fans often contain a ducted housing to direct outgoing air in a specific direction or across a heat sink. Type 4 backward inclined blower wheels are available with a flat blade design. Such a fan is also called a blower fan biscuit blower citation needed or squirrel cage fan because it looks like a hamster wheel. Blade design parameters are defined with asd grid a a 3d view.

Fan efficiencies differ from design to design and also by types. 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. Fans blowers and compressors see table 5 1. 5 2 fan types fan and blower selection depends on the volume flow rate pressure type of material handled space limitations and efficiency.

Fig 3 shows the velocity diagram for the air flowing into the fan inlet and out of it outlet. Straight radial blade fans tend to be used in lower airflow higher pressure applications. 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. 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.

The blades of these fans are or end up radially to the fan s shaft. A centrifugal fan is a mechanical device for moving air or other gases in a direction at an angle to the incoming fluid. 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. A fair running static efficiency is 50 70 percent for both the.

The flow is axial at entry and exit. 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. C a close up view at the trailing edge region of the deformed blade. 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.