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Centrifugal Fan and Axial Flow Fan Characteristic and Usage
2016-08-15 10:59


Fans and blowers provide air for ventilation and industrial process requirements. Fans generate a pressure to move air (or gases) against a resistance caused by ducts, dampers, or other components in a fan system. The fan rotor receives energy from a rotating shaft and transmits it to the air. 
 
Fans, blowers and compressors are differentiated by the method used to move the air, and by the system pressure they must operate against. As per American Society of Mechanical Engineers (ASME) the specific ratio - the ratio of the discharge pressure over the suction pressure - is used for defining the fans, blowers and compressors.
 
Centrifugal Fan: Types The major types of centrifugal fan are: radial, forward curved and backward curved. Radial fans are industrial workhorses because of their high static pressures (upto 1400 mm WC) and ability to handle heavily contaminated airstreams. Because of their simple design, radial fans are well suited for high temperatures and medium blade tip speeds. Forward-curved fans are used in clean environments and operate at lower temperatures. They are well suited for low tip speed and high-airflow work - they are best suited for moving large volumes of air against relatively low pressures. Backward-inclined fans are more efficient than forward-curved fans. Backwardinclined fans reach their peak power consumption and then power demand drops off well within their useable airflow range. Backward-inclined fans are known as "nonoverloading" because changes in static pressure do not overload the motor. 
 
Axial Flow Fan: Types The major types of axial flow fans are: tube axial, vane axial and propeller. Tubeaxial fans have a wheel inside a cylindrical housing, with close clearance between blade and housing to improve airflow efficiency. The wheel turn faster than propeller fans, enabling operation under high-pressures 250 – 400 mm WC. The efficiency is up to 65%. 
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