Performance Characteristics Of Centrifugal Fans

The centrifugal fan is essentially a variable flow constant pressure device. When the speed is constant, the theoretical pressure-flow curve of the centrifugal fan should be a straight line. Due to internal losses, the actual characteristic curve is curved. The pressure generated in a centrifugal fan is greatly affected by changes in intake air temperature or density. For a given amount of intake air, the pressure generated at the highest intake temperature (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 runs at a constant speed For a given flow rate, the required power increases as the intake air temperature decreases.