For a perfect gas, such as air over a limited temperature range, the Mach number can be written as Whenever the Mach number in a flow exceeds about 0. High power turbomachines require high flow rates and high blade speeds and this inevitably leads to compressible flow. The static and stag- nation quantities in the flow can be related using functions of the local Mach number and these are derived later. This shows the relative stagnation properties as well as the absolute properties for a single point in a flow.
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Pelton wheel hydraulic turbine Radial flow fan. Types of turbomachines can also be defined as to the. Other special types of turbomachines exist, e. Considering the two classes of machines listed in Table 1. The first is that the left-hand column consists?
This decrease or increase in head, when multiplied by the weight flow per unit time of fluid through the machine, represents the energy absorbed by or extracted from the rotating blades, which are fixed onto a shaft The energy transfer is effected in both cases by changing the angular momentum of the fluid. It might therefore be reasonable to assume that different types of turbomachine would exhibit differing shapes of blades and rotating members, and this indeed is the case, as is shown in Fig.
In addition, because turbomachines have developed historically at different times, names have been given to certain parts of the machines as well as to different types of machines, and these are now defined. A machine that produces power by expanding a continuously flowing fluid to a lower pressure or head; the power output is usually expressed in kW.
A machine that increases the pressure or head of a flowing liquid, and.
HYDRAULIC AND COMPRESSIBLE FLOW TURBOMACHINES PDF
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Hydraulic and compressible flow turbomachines