Abstract
AbstractFans are machines that move air or a similar gas. With regard to types, there are axial, radial and mixed-flow fans. Principles for the analysis of axial machines have been elaborated in the foregoing chapters, but for radial machines, only a limited theory has been developed. The fan chapter is therefore also used to complete the theory for power receiving radial machines. It is appropriate to do this with fans. First, a fan is a simple turbomachine. Further, there are various rotor shapes with radial fans (forward curved blades, radial-end blades and backward curved blades), as opposed to radial pumps (only backward curved blades) and radial compressors (radial-end and backward curved blades). In this chapter, we also discuss the performance evaluation of radial fans, rotor design choices with radial fans and performance of axial and mixed-flow fans.
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