DE-Lecture08-Pump-Types

DE-Lecture08-Pump-Types - Dredging Engineering Dredging...

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Unformatted text preview: Dredging Engineering Dredging Engineering Lecture 08 Lecture 08 Basics of Basics of Pumps Pumps- Pumps versus turbines Pumps versus turbines- Centrifugal Pump Types Centrifugal Pump Types- Basic Terminology of Pumping Basic Terminology of Pumping Luis Prieto-Portar 2010 Fluid Machines or Turbo-Machinery. There are two broad categories of turbo-machinery: - pumps and- turbines . - Pumps add energy to a fluid , resulting in an increase in fluid pressure. - Turbines extract energy from a fluid , resulting in a decrease in fluid pressure. The difference between pumps and turbines. Fluid machines, such as pumps and turbines supply and extract energy by means of a rotating shaft . The rotation of the shaft has been the origin of their name “ turbo ” which in Latin means “ spin ”. However, not all fluid machines involve a rotating shaft, as for example, displacement pumps. Fluid machines are either (1) positive-displacement or (2) dynamic , according to the manner in which energy is transferred. An example of a positive- displacement pump is our human heart (which is present in most humans). The human heart is a positive- displacement machine because it is designed with two one-way valves that open to let blood in as the heart chambers expand, and with two other one-way valves that open as blood is pushed out of those chambers when they contract. (The valves are the tricuspid, pulmonary, mitral and aortic). The human heart is a positive displacement pump. Therefore, in positive–displacement fluid machines the fluid is directed into a closed volume, and then energy is transferred to it by the movement of the boundary of closed volume. This movement causes the volume to expand or contract, and thereby suck the fluid in or squeeze it out, respectively. They are basically either reciprocating or rotary pistons. In contrast, dynamic fluid machines do not have closed volumes. Instead, the energy is transferred via rotating blades. Pumps use impeller blades ....
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DE-Lecture08-Pump-Types - Dredging Engineering Dredging...

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