There are two broad categories of turbomachinery, pumps and turbines. The word pump is a general term for any fluid machine that adds energy to a fluid. Some authors call pump s energy absorbing devices since energy is supplied to them, and they transfer most of that energy to the fluid, usually via a rotating shaft . The increase in fluid energy is usually felt as an pressure of the fluid.
Turbines, on the other hand, are energy producing devices — they extract energy from the fluid and transfer most of that energy to some form of mechanical energy output, typically in the form of a rotating shaft . The fluid at the outlet of a turbine suffers an energy loss, typically in the form of a loss of pressure.
Positive displacement pumps are ideal for high-pressure applications like pumping viscous liquids or thick slurries, and for applications where precise amounts of liquid are to be dispensed or metered, as in medical applications. Positive-displacement pumps have many advantages over dynamic pumps. For example, a positive-displacement pump is better able to handle shear sensitive liquids since the induced shear is much less than that of a dynamic pump operating at similar pressure and flow rate. Blood is a shear sensitive liquid, and this is one reason why positive-displacement pumps are used for artificial hearts.
There are three main types of dynamic pumps that involve rotating blades called impeller blades or rotor blades, which impart momentum to the fluid. For this reason they are sometimes called rotodynamic pumps or simply rotary pumps (not to be confused with rotary positive-displacement pumps, which use the same name). There are also some non rotary dynamic pumps, such as jet pumps and electromagnetic pumps; these are not discussed in this text. Rotary pumps are classified by the manner in which flow exits the pump: centrifugal flow, axial flow, and mixed flow.
Centrifugal pumps and blowers can be easily identified by their snail-shaped casing, called the scroll . They are found all around your home—in dishwashers, hot tubs, clothes washers and dryers, hairdryers, vacuum cleaners, kitchen exhaust hoods, bathroom exhaust fans, leaf blowers, furnaces, etc. They are used in cars—the water pump in the engine, the air blower in the heater/air conditioner unit, etc. Centrifugal pumps are ubiquitous in industry as well; they are used in building ventilation systems, washing operations, cooling ponds and cooling towers, and in numerous other industrial operations in which fluids are pumped.
Axial pumps do not utilize so-called centrifugal forces. Instead, the impeller blades behave more like the wing of an airplane , producing lift by changing the momentum of the fluid as they rotate. The rotor of a helicopter, for example, is a type of axial-flow pump .
In an impulse turbine, the fluid is sent through a nozzle so that most of its available mechanical energy is converted into kinetic energy. The high speed jet then impinges on bucket-shaped vanes that transfer energy to the turbine shaft.
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