Lecture 26 - Chapter 12 Turbomachines Turbomachines are...

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1 Chapter 12. Turbomachines Turbomachines are mechanical devices that either extract energy from a fluid (turbine) or add energy to a fluid (pump) as a result of dynamic interactions between the device and the fluid. While the actual design and construction of these devices often require considerable insight and effort, their basic operating principles are quite simple.
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2 Chapter 12. Turbomachines 12.1. Types of fluid machinery:
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3 12.2. Pumps Positive displacement (PD) pumps: A positive displacement pump is a rotary or reciprocating machine. PD pumps have an expanding cavity on the suction side and a decreasing cavity on the discharge side. Liquid flows into the pumps as the cavity on the suction side expands and the liquid flows out of the discharge as the cavity collapses. The volume is constant given each cycle of operation.
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4 12.2. Pumps http://toolboxes.flexiblelearning.net.au/demosites/series2/204/pmaops201b/proc201- 010100-recognise-pumps.htm Centrifugal pumps: A centrifugal pump is a rotary machine where energy is continuously imparted to a liquid by a rotating impeller, propeller or rotor.
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5 12.3. Pump selection and performance In order to choose the appropriate pump, a pipeline system designer will first look separately at the behavior of the piping system and will next then choose the appropriate pump.
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