Axial Flow Fan Blade Angle

Google scholar mizuno and kikuchi 1990 mizuno t and kikuchi k.

Axial flow fan blade angle.

Characteristics of axial flow fan with diagonal flow hub. These laws govern airflow pres sure capability and power required among many other parameters. In simple words the angle of a blade is known as pitch. 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.

Duct mounted fan wall mounted fan bifurcated fan v belt driven units. Axial flow fans 1 0 definition of axial fans an axial flow fan moves air or gas parallel. Bulletin of japanese society of mechanical engineering 28 241. The pitch angle of the blades are varied through a controller e g a pneumatic actuator with increasing blade angle for increasing flow rates and vice versa for reducing flow rates.

The blade angle is adjusted with the help of a hydraulic actuator fixed with the shaft from minimum to maximum position to ensure maximum possible efficiency. Fan laws set of laws that predict perfor mance changes if one or more parameters are changed from one fan or operating condition to another. In this paper the performance of axial fan was analyzed and by. Manufacturer of axial flow fans axial fans kitchen exhaust axial flow fans inline fans and air slide fan offered by green planet engineers faridabad haryana.

Effect of blade surface roughness on performance of axial flow fans with different blade cambers. The present results show that. Fig 3 shows the velocity diagram for the air flowing into the fan inlet and out of it outlet. Cast aluminium impeller having fixed or variable pitch angle aero dynamic blades.

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. Flow velocity and volume of axial fan are changed by pitch angle frame the number of blade camber angle and chord length. Axial fans with three kinds of blades are discussed and compared under design and off design conditions. Blade pitch control is applied to axial fans with fixed speed to control air flow see figure vi 3 2 1 d.

The flow is axial at entry and exit. In general the manufacturers tilt 5 10 degree for an ordinary fan and 30 55. Under design conditions the total pressure efficiency of the axial flow fan with the forward swept blade is the highest and the c type blade has slightly lower efficiency while the straight blade has the. Variable pitch axial flow fans are used for vav air conditioning systems.

The characteristics for a typical fan are given in fig.