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### Transcript of Centrifugal Compressor - Wi

Centrifugal compressor - Wikipedia, the free encyclopedia

http://en.wikipedia.org/wiki/Centrifugal_compressor

Centrifugal compressors, sometimes referred to as radial compressors, are a sub-class of dynamic axisymmetric work-absorbing turbomachinery.[1] The idealized compressive dynamic turbo-machine achieves a pressure rise by adding kinetic energy/velocity to a continuous flow of fluid through the rotor or impeller. This kinetic energy is then converted to an increase in potential energy/static pressure by slowing the flow through a diffuser. Imagine a simple case where flow passes through a straight pipe to enter centrifugal compressor. The simple flow is straight, uniform and has no swirl. As the flow continues to pass into and through the centrifugal impeller, the impeller forces the flow to spin faster and faster. According to a form of Euler's fluid dynamics equation, known as pump and turbine equation," the energy input to the fluid is proportional to the flow's local spinning velocity multiplied times the local impeller tangential velocity. In many cases the flow leaving centrifugal impeller is near or above 1000 ft./s or approximately 300 m/s. It is at this point, in the simple case according to Bernoulli's principle, where the flow passes into the stationary diffuser for the purpose of converting this velocity energy into pressure energy.[1]

Centrifugal impeller with a highly polished surface likely to improve performance

1 Historical contributions, the pioneers 1.1 Partial timeline 2 Turbomachinery similarities 3 Components of a simple centrifugal compressor 3.1 Inlet 3.2 Centrifugal impeller 3.3 Diffuser 3.4 Collector 4 Applications 5 Performance 5.1 Performance maps 5.2 Surge 5.3 Maximum flow line versus choke 5.4 Other operating limits 6 Dimensional analysis 6.1 theorem 6.2 Classic turbomachinery similitude 6.3 Other dimensionless combinations 6.4 Affinity laws 7 Aero-thermodynamic fundamentals 7.1 Conservation of mass 7.2 Conservation of momentum 7.3 Conservation of energy 7.4 Equation of state 8 Pros & cons 9 Turbomachinery 10 See also1 of 15

Jet engine cutaway showing the centrifugal compressor and other parts

7/12/2011 11:37 AM

Centrifugal compressor - Wikipedia, the free encyclopedia

http://en.wikipedia.org/wiki/Centrifugal_compressor