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Radial diffuser vane for centrifugal compressors

A diffuser and guide vane technology, applied in the field of compressors, can solve problems such as low choke

Inactive Publication Date: 2013-06-12
NUOVO PIGNONE SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] It also causes certain disadvantages when this diffuser blade shape is used as part of a diffuser in a centrifugal compressor
For example, employing a diffuser vane 208 with a conformally mapped mid-arc is problematic in a centrifugal compressor because the trailing edge of the diffuser vane with that shape is highly loaded and the compressor has a low Choke limit

Method used

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  • Radial diffuser vane for centrifugal compressors
  • Radial diffuser vane for centrifugal compressors
  • Radial diffuser vane for centrifugal compressors

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Embodiment Construction

[0033] The following detailed description of the exemplary embodiments refers to the accompanying drawings. The same reference numbers in different drawings identify the same or similar elements. Also, the following detailed description does not limit the invention. Rather, the scope of the invention is defined by the appended claims.

[0034] To provide some context for the following discussion regarding diffuser vanes and diffuser vane shapes according to exemplary embodiments, FIG. 3 schematically illustrates an exemplary multistage centrifugal compressor in which such diffuser vanes may be employed. 300. Therein, a compressor 300 includes a case or housing (stator) 302 within which is mounted a rotating compressor shaft 304 provided with a plurality of centrifugal rotors or impellers 306 . Rotor assembly 308 includes shaft 304 and rotor 306 and is supported radially and axially by bearings 310 disposed on either side of rotor assembly 308 .

[0035] Multi-stage centrif...

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Abstract

Devices, systems and methods according to exemplary embodiments provide diffusers, e.g., as part of a turbo machine 300, with diffuser vanes having S-shaped camber lines 408. Such S-shaped camber lines 408 are defined by functions having an inflection point. Using diffuser vanes 400 having such shapes results in, among other things, an operation characteristic wherein a portion of the diffuser vanes 400 disposed near a leading edge 402 is substantially unloaded when operating at design conditions and wherein the load gradually increases to a maximum loading value towards a middle portion of the diffuser vanes.

Description

technical field [0001] The present invention relates generally to compressors and, more particularly, to diffuser vanes for centrifugal compressors. Background technique [0002] A compressor is a machine that accelerates gas particles by using mechanical energy to ultimately increase the pressure of a compressible fluid, such as a gas. Compressors are used in many different applications, including as the initial stage of a gas turbine engine. Among the various types of compressors are so-called centrifugal compressors, in which mechanical energy is pumped centrifugally, for example by rotating a centrifugal impeller (sometimes called a "rotor") through which the compressible fluid passes. The gas input to the compressor is active. More generally, it can be said that a centrifugal compressor is part of a certain class of machine known as a "turbine" or "turbine rotating machine". [0003] Centrifugal compressors can be equipped with a single impeller, ie a single-stage co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/44
CPCF04D29/444Y10T29/4932F05D2250/52F01D9/00F04D29/281F04D29/30F04D29/542
Inventor S.拉哈克里什南L.塔皮纳西C.S.I.斯文斯多特
Owner NUOVO PIGNONE SPA
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