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As an example, a 250 HP compound compressor is a large piece of equipment that generally requires a special foundation, building accommodations and highly trained riggers to place the equipment. On the other hand, a 250 HP rotary-screw compressor can be placed on an ordinary shop floor using a standard forklift .
The relatively recently developed conical screw compressor is a type of rotary-screw compressor using a different topology from the typical dual-screw type. In effect it can be thought of as a conical spiral extension of a gerotor , although the exact geometry is somewhat different due to the angular offset.
A rotary vane compressor is well suited to electric motor drive and is significantly quieter in operation than the equivalent piston compressor. Rotary vane compressors can have mechanical efficiencies of about 90%. [12]
The simplest inlet to a centrifugal compressor is typically a simple pipe. Depending upon its use/application inlets can be very complex. They may include other components such as an inlet throttle valve, a shrouded port, an annular duct (see Figure 1.1), a bifurcated duct, stationary guide vanes/airfoils used to straight or swirl flow (see Figure 1.1), movable guide vanes (used to vary pre ...
On civil turbofans, the first stage of the LP compressor is often a single-stage fan. If the HP compressor pressure ratio exceeds about 4.5:1, then the unit will probably have variable geometry (i.e. variable stators) on the first few stages, to make the surge line on the compressor map more shallow, to accommodate the shallow working line.
Compressor – Machine to increase pressure of gas by reducing its volume; Gas duster – Product used for dusting devices – (generally use fluorocarbons but some use compressed air.) Rotary-screw compressor – Gas compressor using a rotary positive-displacement mechanism
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The General Electric J79 was the first major example of a variable stator design, and today it is a common feature of most military engines. Closing the variable stators progressively, as compressor speed falls, reduces the slope of the surge (or stall) line on the operating characteristic (or map), improving the surge margin of the installed unit.
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