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Expansion process and Application characteristics of centrifugal Fan

Wuxi JN Fan Co.,Ltd | Updated: Oct 13, 2018

The working principle of the centrifugal fan is basically the same as that of the turbine compressor, only because the gas velocity is low and the pressure changes little, the change of the specific volume of the gas is generally not considered in the operation, that is, the gas is treated as an incompressible fluid. According to the principle that kinetic energy is converted into potential energy, centrifugal fan accelerates gas by using high speed rotating impeller, then slows down, changes the direction of flow and converts kinetic energy into potential energy (pressure). In the single stage centrifugal fan, the gas enters the impeller from the axial direction and changes into the radial direction when the gas flows through the impeller, then enters the diffuser.

In the diffuser, the gas changed the flow direction and the cross section area of the pipeline increased to slow down the air flow, which reduced the kinetic energy into the pressure energy. The pressure increase occurred mainly in the impeller, and then in the spreading process. In the multi-stage centrifugal fan, the air flow enters the next impeller with a backflow device, resulting in higher pressure.

Centrifugal fan is essentially a constant pressure device with variable flow rate. When the speed of centrifugal fan is constant, the theoretical curve of pressure-flow rate should be a straight line. Due to internal loss, the actual characteristic curve is curved. The pressure produced in centrifugal fan is greatly affected by the change of inlet air temperature or density. For a given intake, the pressure generated at the highest inlet temperature (the lowest air density) is the lowest. For a given pressure and flow characteristic curve, there is a power and flow characteristic curve. When the blower is running at constant speed, the required power increases with the decrease of inlet temperature for a given flow rate.https://www.jnblower.com/

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