Blower Fan Blade Design

A centrifugal fan is a mechanical device for moving air or other gases in a direction at an angle to the incoming fluid.

Blower fan blade design.

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. Comparing forward curved blades backward curved blades and straight blades for a blower impeller. 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. 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.

The shape of your blades and the direction they travel will define the performance characteristics of your fan. Type 4 backward inclined blower wheels are available with a flat blade design. Process design of fans and blowers project standards and specifications page 7 of 26 rev. C a close up view at the trailing edge region of the deformed blade.

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. Fans blowers and compressors see table 5 1. 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. B a chordwise view with a deformed blade.

Typical ranges of fan efficiencies are given in table 5 2. Fig 3 shows the velocity diagram for the air flowing into the fan inlet and out of it outlet. A fair running static efficiency is 50 70 percent for both the. Blade design parameters are defined with asd grid a a 3d view.

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. Fan efficiencies differ from design to design and also by types. Centrifugal fans often contain a ducted housing to direct outgoing air in a specific direction or across a heat sink. 5 2 fan types fan and blower selection depends on the volume flow rate pressure type of material handled space limitations and efficiency.

The flow is axial at entry and exit. Such a fan is also called a blower fan biscuit blower citation needed or squirrel cage fan because it looks like a hamster wheel. Straight radial blade fans tend to be used in lower airflow higher pressure applications. Fan blower design selection industrial air flow design principles for fan blower applications.