What is the working principle of centrifugal fans?
Centrifugal fan working principle and turbine compressor is basically the same, are due to low gas flow rate, the pressure change is not
The pressure generated in the centrifugal fan is greatly influenced by changes in the inlet temperature or density. For a given intake air volume, the maximum intake air temperature (lowest air density) produces the lowest pressure. For a given pressure and flow characteristic curve, there is a power and flow characteristic curve. When the blower runs at constant speed , The required power increases with a decrease in the intake air temperature for a given flow rate.
Centrifugal fan is a variable flow constant pressure device. When the speed is constant, the pressure-flow curve of the centrifugal fan should be a straight line. Due to the internal loss, the actual characteristic curve is curved
Centrifugal fans can be made of both right and left. From the motor side of the face: the impeller clockwise rotation, known as the right rotating fan; impeller counterclockwise rotation, known as the left rotating fan.
It is generally not necessary to consider changes in the specific volume of the gas, i.e., treat the gas as an incompressible fluid.
