A diffuser for a centrifugal compressor or a nozzle assembly for a the inner and outer peripheries of the housing, each vane being defined by. Rotary vane compressors consist of a cylindrical casing, two openings – one suction and one discharge – and a rotor positioned eccentrically with respect to the. Variable inlet guide vanes are an ingenious yet simple option that, when installed on your centrifugal compressor, can deliver energy savings of up to 9 percent.

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Improvements in centrifugal compressors have not been achieved through large discoveries. To read more about Air Compressor Technology, please visit www.

The map shown in Figure 5. The following interview describes how centrifugal compressor efficiency can be improved thanks to recent developments in IGV technology. Most turbomachines are designed to easily withstand occasional surging. The wall 1 has a ring of holes 20 communicating with interior of chamber 21 and each communicating with a hole 24 in adjacent support plate 9 with one of the spaces 16 within each vane which is defined by the partitions 6 and 7 of FIG.

In contrast, for lower speed equipment, as flows increase, losses increase such that the pressure ratio eventually drops to 1: The pressure rise in the impeller is in most cases almost equal to the rise in the diffuser.

What are vane compressors? For example, the edges of the partitions may be slid into grooves formed in the end faces of the walls.

As the flow passes through the centrifugal impeller, the impeller forces the flow to spin faster as it gets further from the rotational axis. There is a space 16 within each vane between the partitions 6 and 7 which define the vane. For example, the edges of the partitions may be slid into grooves formed in the end faces of the walls. To start this list two of the most well-known centrifugal compressor applications are listed; gas turbines and turbochargers. In contrast to gas turbines, most other applications including industrial need to meet a less stringent set of performance requirements.


Diffusers can be vaneless, vaned or an alternating combination. Over the past years, applied scientists including Stodola—[2] Pfleiderer[3] Hawthorne[4] Shepard[1] Lakshminarayana[5] and Japikse many texts including citations[6] [7] [8] [9] have educated young engineers in the fundamentals of turbomachinery. The ports 23 are shown for example in the partition 6 of FIG.

Again, the engineering methods used to design a centrifugal pump are the same as those to design a centrifugal compressor.

Variable Inlet Guide Vanes Boost Centrifugal Air Compressor Efficiency

The diffuser contains a plurality of circumferentially-spaced vanes each being formed from a pair of partitions 6, 7 of sheet metal cfntripetal other suitable sheet material extending between and supported by the walls 1, 2. System resistance or adverse pressure is proven mathematically to be the critical contributor to compressor surge.

By using this site, you agree to the Terms of Use and Privacy Policy. This decreases the power required to deliver the rated airflow and pressure. Other advantages are that by suitable location of the partition-supporting spigots or equivalent means any desired shape of diffuser passage 15 and any desired throat width A or angle of attack can be produced.

Higher pressure ratio turbocharger centrifugal centrupetal exhibit this same phenomenon. Due to this pre-rotation, less power is required to compress the incoming airstream. Although the illustrated constructions are for diffusers for use with centrifugal compressors, similar constructions may be used as nozzle assemblies for use with centripetal turbines. One object of the invention is to provide a light-weight working fluid guidance assembly, as hereinbefore defined, which is also cheap and quick to manufacture.

The two most common methods used for testing cetripetal compressors is to test along lines of constant shaft speed or along lines of constant throttle.


Lines of constant power could just as easily be substituted.

Under specific conditions, the operation of a Centrifugal compressor is considered a reversible process. A radial flow turbo-machine including a compressoe fluid guidance assembly as claimed in claim 5. This is identical to an axial compressor with the exception that the gases can reach higher velocities and energy levels through the impeller’s increasing radius. This is because it is nearly impossible to change one of these parameters independently.

This location may occur at the impeller inlet “throat” or at the vaned diffuser inlet “throat”. The following equations outline a fully three-dimensional mathematical problem that is very difficult to solve even with simplifying assumptions.

Different Type Air Compressors

Euler’s pump and turbine equationplays an important role in understanding impeller performance. Cut-away of a centrifugal pump. Since this additional air is not normally required, the compressor intake must be throttled to match the ecntripetal demand.

If desired, the partitions 6 and 7 need not extend fully to the outer periphery 5 of the diffuser. Compressor Surge and Stall. The Wikipedia entry for equations of state is very thorough.

US1644565A – Centripetal compressor – Google Patents

For example, the portion of each partition 7 extending beyond a point D opposite to the outer tip B of the partition 6 of one adjacent vane may be omitted between the point D and the outer tip E of that partition. Search the Compressed Air Wiki. Centrifugal compressor for supercharging internal-combustion engines. Search Expert Search Quick Search. Device for the open- or closed-loop control of gas turbine engines or turbojet engines.