Abstract
Axial flow pumps, fans, compressors and turbines have, as a common feature, blades which interact with the fluid involved. Typical machine flow paths are shown in Fig. 3.1, and in the two-dimensional approach that will be discussed it is assumed that the stream surfaces are symmetrical with the axis of rotation. Both the isolated aerofoil and cascade data are described, with the limitation just outlined. The three-dimensional problems are then introduced, and the concepts of radial equilibrium, the actuator disc approach, and Howell’s work done factor are related to the common secondary flow problems.
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