Page 21 - Fluid Mechanics and Thermodynamics of Turbomachinery

2 Fluid Mechanics, Thermodynamics of Turbomachinery

FIG. 1.1. Diagrammatic form of various types of turbomachine.

Figure 1.1(a) and (e)). When the path of the through-flow is wholly or mainly in a plane
perpendicular to the rotation axis, the device is termed a radial flow turbomachine (e.g.
Figure 1.1(c)). More detailed sketches of radial flow machines are given in Figures 7.1,
7.2, 8.2 and 8.3. Mixed flow turbomachines are widely used. The term mixed flow in
this context refers to the direction of the through-flow at rotor outlet when both radial
and axial velocity components are present in significant amounts. Figure 1.1(b) shows
a mixed flow pump and Figure 1.1(d) a mixed flow hydraulic turbine.
One further category should be mentioned. All turbomachines can be classified
as either impulse or reaction machines according to whether pressure changes are