WO2014035806A1 - Diffuser assembly comprising diffuser vanes pivoting about the leading edge - Google Patents
Diffuser assembly comprising diffuser vanes pivoting about the leading edge Download PDFInfo
- Publication number
- WO2014035806A1 WO2014035806A1 PCT/US2013/056328 US2013056328W WO2014035806A1 WO 2014035806 A1 WO2014035806 A1 WO 2014035806A1 US 2013056328 W US2013056328 W US 2013056328W WO 2014035806 A1 WO2014035806 A1 WO 2014035806A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- diffuser
- leading edge
- diffuser assembly
- assembly
- rotation axis
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/46—Fluid-guiding means, e.g. diffusers adjustable
- F04D29/462—Fluid-guiding means, e.g. diffusers adjustable especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2250/00—Geometry
- F05D2250/50—Inlet or outlet
- F05D2250/52—Outlet
Definitions
- compressor devices e.g., centrifugal compressors
- diffusers and diffuser vanes for a compressor device.
- Compressor devices e.g., centrifugal compressors
- a diffuser assembly to convert kinetic energy of a working fluid into static pressure by slowing the velocity of the working fluid through an expanding volume region.
- An example of a diffuser assembly typically utilizes several diffuser vanes in circumferential arrangement about an impeller.
- variable diffuser vanes move to change the orientation of the leading edge and the trailing edge. This feature helps to tune operation of the compressor device.
- Known designs for variable diffuser vanes rotate about an axis that resides in the lower half, i.e., closer to the leading edge than the trailing edge of the diffuser vanes.
- variable diffuser vanes The location for the axis of rotation permits the trailing edge to sweep through large angles and, thus, enables better tuning and optimization of compressor performance.
- implementation of the conventional designs for variable diffuser vanes move (e.g., rotate) both the trailing edge and the leading edge with respect to the incoming working fluid. This feature can have a negative impact on the performance of the compressor.
- the change in position of the leading edge which results from the change in angular orientation of the diffuser vane, can cause the flow of the working fluid to prematurely separate from the surface of the diffuser vane, thus reducing the effectiveness of the variable diffuser vane to tune performance of the compressor device.
- This disclosure presents embodiments of a diffuser assembly that incorporates diffuser vanes with a trailing edge that changes position to improve flow performance of a compressor device.
- the diffuser vanes maintain the position of the leading edge relative to the orientation of the working fluid.
- these embodiments prevent pre-mature flow separation of the incoming working fluid from the surfaces of the diffuser vane. At least this feature can provide better control and optimization of compressor performance over a large flow range.
- FIG. 1 depicts a perspective view of an exemplary diffuser vane
- FIG. 2 depicts a detail view of the leading edge of the exemplary diffuser vane of FIG. 1
- FIG. 3 depicts a top view of the exemplary diffuser vane of FIG.1
- FIG. 4 depicts a schematic view of an exemplary diffuser assembly that incorporates a plurality of diffuser vanes, e.g., the diffuser vane of FIGS.1 and 2
- FIG. 5 depicts a side, cross-section view of the diffuser assembly of FIG. 3
- FIG. 6 depicts a perspective view of an exemplary compressor device that can incorporate a diffuser assembly, e.g., the diffuser assembly of FIGS.4 and 5.
- a diffuser assembly e.g., the diffuser assembly of FIGS.4 and 5.
- FIG. 1 illustrates a perspective view of a diffuser vane 100.
- the diffuser vane 100 has a vane body 102 with a leading edge 104 and a trailing edge 106.
- a chord length L defines the straight-line distance between the leading edge 104 and the trailing edge 106.
- the vane body 102 has an aerodynamic shape (e.g., an airfoil) with a suction side surface 108 and a pressure side surface 110 identified relative to the orientation and angle of attack of the leading edge 104 relative to a flow F of a working fluid.
- the vane body 102 converges to a tip 112 with a rotation axis 114.
- the tip 112 is round and/or has a curvilinear outer surface 116 defined by a radius R TIP that extends from a center axis 118.
- the tip 112 exhibit a shape (e.g., a point) that maintains the aerodynamics of the diffuser body 102.
- this disclosure also contemplates configurations of the tip 112 having less than optimal aerodynamic shapes (e.g., blunt shapes) as desired.
- the rotation axis 114 resides proximate the leading edge 104 and, for example, within 5 % or less of the chord length L (as measured from the leading edge 104). Depending on the size and shape of the tip 112, other exemplary locations for the rotation axis 114 can be found within an area that the radius R TIP defines about the center axis 118. In one example, the rotation axis 114 is coaxial with the center axis 118 of the tip 112.
- the diffuser vane 100 actuates about the rotation axis 114.
- the diffuser vane 100 rotates to change the position of the trailing edge 106 from a first position 120 to a second position, identified by phantom lines and the numeral 122.
- Such a change may accommodate changes in the direction of the flow F, e.g., from a first flow F1 orientation to a second flow F2 orientation.
- the leading edge 104 is secured on the rotation axis 114 to limit changes to the position of the leading edge 104, e.g., as the trailing edge 106 moves between the first position 120 and the second position 122.
- This feature maintains the orientation of the leading edge 104 with the second flow F2 to reduce the likelihood of flow separation, while providing adequate adjustment of the trailing edge 106 to dictate changes in the performance, e.g., of a compressor device.
- FIG. 4 illustrates a schematic view of the diffuser vane 100 as part of a diffuser assembly 124.
- the diffuser assembly 124 includes a vane array 126 that features a plurality of the diffuser vanes 100 in circumferential orientation about an impeller axis 128.
- the leading edge 104 of the diffuser vanes 100 reside proximate a pivot boundary 130, which is generally identified by the phantom circle having a center axis 132.
- a plurality of pivot members 134 secure to the diffuser vanes 100.
- the pivot members 134 maintain the position of leading edge 104 and, in one example, impart force to the diffuser vanes 100 to rotate the trailing edge 106 to different positions, e.g., between first position 120 and second position 122 shown in FIG.3.
- the pivot boundary 130 defines the circumferential location of the leading edges 104 of the diffuser vanes 100, e.g., relative to the impeller axis 128.
- Construction of the diffuser assembly 124 can affix the diffuser vane 100 to limit movement of the diffuser vanes 100 to rotation about the rotation axis 114. This configuration minimizes displacement of the leading edge 104 relative to the pivot boundary 130 and relative to one another.
- the rotation axis 114 on the diffuser vanes 100 align with the pivot boundary 130.
- one or more of the diffuser vanes 100 can be spaced apart from the pivot boundary 130, e.g., aligned in a different circumferential location relative to the impeller axis 128. As shown in FIG.
- the diffuser vanes 100 can be equally spaced apart from one another. Securing the diffuser vanes 100 in position affixes the angular spacing between the leading edge 104 of adjacent diffuser vanes 100. Such construction can ensure consistent flow separation, e.g., by placing the leading edge 104 of the diffuser vanes 100 in a known location across the vane array 126.
- the diffuser vanes 100 in the vane array 126 can rotate (or pivot) about the rotation axis 114, e.g., to change the angular position of the trailing edge 106.
- the angular position accommodates changes in the direction of the flow of the working fluid.
- the orientation of the leading edge 104 remains relatively unchanged with respect to the direction and/or orientation of the flow F of the working fluid. This feature provides a much more consistent point of impact for the working fluid on the leading edge 104 throughout the vane array 126.
- the position of the leading edge 104 changes very little and, in turn, the diffuser vanes 100 in the diffuser assembly 124 exhibit minimal flow separation of the working fluid from the surfaces (e.g., suction side surface 108 and the pressure side surface 110 of FIG.1) of the diffuser vanes 100.
- Examples of the pivot members 134 can use a number of devices and mechanisms to rotatably secure the leading edge 104 of the diffuser vanes 100.
- the pivot members 134 can be an integral extension of the diffuser vanes 100 or may be fabricated such as by welding or it may be a separately attached piece of material. Pins and bearings can insert, for example, into the diffuser vanes 100 along the rotation axis 114. These elements provide a pivot and/or pivot point about which the diffuser vanes 100 can rotate.
- the diffuser assembly 124 can include a plurality of support devices, with one of the support devices secured to the bottom surface of each of the diffuser vanes 100.
- Examples of the support devices can couple with actuators, linkages, and other mechanisms to impart movement to the diffuser vanes 100 in the vane array 126.
- the support devices can align with the rotation axis 114 and/or be constructively offset to allow rotation of the diffuser vanes 100 about the rotation axis 114 as set forth herein.
- FIG. 5 depicts a side, cross-section view of the diffuser assembly 124 taken at line A-A of FIG. 4.
- the diffuser assembly 124 includes one or more wall members (e.g., a first wall member 136 and a second wall member 138).
- the wall members 136, 138 form a diffuser cavity 140 in which the array 126 of the diffuser vanes 100 is found.
- the pivot members 134 couple the diffuser vanes 100 to one of the wall members 136, 138. This configuration allows the diffuser vanes 100 to rotate about the rotation axis 114 to change the position of the trailing edge 104 on the diffuser vanes 100.
- FIG. 6 depicts a perspective view of an example of a compressor device 200 that can incorporate a diffuser assembly (e.g., diffuser assembly 124 of FIGS. 4 and 5).
- the compressor 200 has an inlet 202 and a volute 204 that forms an outlet 206.
- the compressor 200 also includes a drive unit 208 that rotates an impeller 210 to draw a working fluid (e.g., air) through the inlet 202.
- the impeller 210 compresses the working fluid.
- the compressed working fluid flows into the volute 204 and out of the outlet 206.
- Examples of the compressor 200 find use in a variety of settings and industries including automotive industries, electronics industries, aerospace industries, oil and gas industries, power generation industries, petrochemical industries, and the like.
- FIG. 7 illustrates a front view of the compressor device 200 in which some of the components are removed for clarity to illustrate one exemplary implementation of a diffuser assembly.
- the volute 204 forms at least a portion of the diffuser cavity (e.g., diffuser cavity 140 of FIG 5).
- the array 126 resides in this portion of the volute 204. In one example, the array 126 is upstream of the outlet 206 .
- rotation of the impeller 210 draws a working fluid into the inlet (e.g., inlet 202 of FIG. 6). The working fluid flows into the volute 204, through the array 126, and exits the outlet 206.
- the configuration of the array 126 in the compressor 200 allows the diffuser vanes 100 to rotate about the leading edge 104 to change the position of the trailing edge 104 relative to the direction and other characteristics of the flow.
- Manipulation of the diffuser vanes 100 either as a group or individually, tunes the operation of the compressor device 200 to optimize various performance characteristics (e.g., flow parameters of the working fluid at the outlet 206, energy usage, etc.).
- the drive unit 208 turns the impeller 210 to draw the working fluid through the inlet 202.
- the impeller 210 pressurizes the working fluid.
- the pressurized working fluid passes through the diffuser assembly and, in particular, through channels between adjacent diffuser vanes 100.
- the diffuser assembly slows the velocity of the working fluid.
- the diffuser assembly discharges into the volute 204, which delivers the working fluid, e.g., to a downstream pipe that couples with the outlet 206.
- the compressor device 200 undergoes extensive performance testing and tuning to optimize performance for a given application. Such tuning will modify operation, e.g., of the drive unit 208, to adjust the speed of the impeller 210, which effectively modifies flow parameters (e.g., pressure, flow rate, etc.) of the working fluid that exits the outlet 206. Performance of the compressor device 200 will also change in response to the orientation of the diffuser vanes. In one example, tuning will involve adjusting the orientation of the diffuser vanes, which can modify, among other things, the pressure of the working fluid at the outlet 206. Collectively, optimization of flow parameters will likely include incremental changes to several operating parameters of the compressor device 200 to achieve a collective combination, including orientation of the diffuser vanes, that allows the compressor device 200 to operate efficiently to achieve desired flow parameters.
- flow parameters e.g., pressure, flow rate, etc.
- Examples of the diffuser vanes 100 can be constructed of various materials and combinations, compositions, and derivations thereof. These materials include metals (e.g., steel, stainless steel, aluminum), high-strength plastics, and like composites. Material selection may depend on the type and composition of the working fluid. For example, working fluids with caustic properties may require that the diffuser vanes comprise relatively inert materials and/or materials that are chemically inactive with respect to the working fluid.
- Geometry for the diffuser vanes 100 can be determined as part of the design, build, and fitting of the compressor device 200 for the application.
- the geometry can include airfoil shapes, e.g., the shape shown in FIG. 1) for the vane body 102, examples of which take the form of wings and blades and/or other forms that can generate lift.
- the diffuser vanes 100 can mount, e.g., to one of the wall members, using fasteners and fastening techniques that permit rotation of the diffuser vanes about the leading edge. Screws, bolts, pins, bearings, and like components can be used to maintain the position of the leading edge, while further allowing the trailing edge to change position as contemplated herein. These fasteners can secure to the wall members of the diffuser assembly, which can comprise pieces separate from the components of the compressor device or can integrate with existing hardware found in the compressor device.
- embodiments of the diffuser vane and diffuser assembly contemplated herein improve performance of compressors and related devices.
- the trailing edge of the diffuser vanes rotates about the leading edge, which effectively reduces flow separation of the working fluid from the surfaces of diffuser vanes.
- This feature improves performance of the compressor over a larger flow range because the leading edge remains oriented with the flow direction of the working fluid.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201380051296.3A CN104755768A (en) | 2012-08-31 | 2013-08-23 | Diffuser assembly comprising diffuser vanes pivoting about the leading edge |
RU2015107885A RU2015107885A (en) | 2012-08-31 | 2013-08-23 | A diffuser comprising diffuser vanes rotatable around an input edge |
EP13759369.5A EP2890898A1 (en) | 2012-08-31 | 2013-08-23 | Diffuser assembly comprising diffuser vanes pivoting about the leading edge |
BR112015004608A BR112015004608A2 (en) | 2012-08-31 | 2013-08-23 | diffuser assembly comprising diffuser blades rotating the front edge. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/601,352 US20140064933A1 (en) | 2012-08-31 | 2012-08-31 | Diffuser assembly comprising diffuser vanes pivoting about the leading edge |
US13/601,352 | 2012-08-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2014035806A1 true WO2014035806A1 (en) | 2014-03-06 |
Family
ID=49118797
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2013/056328 WO2014035806A1 (en) | 2012-08-31 | 2013-08-23 | Diffuser assembly comprising diffuser vanes pivoting about the leading edge |
Country Status (6)
Country | Link |
---|---|
US (1) | US20140064933A1 (en) |
EP (1) | EP2890898A1 (en) |
CN (1) | CN104755768A (en) |
BR (1) | BR112015004608A2 (en) |
RU (1) | RU2015107885A (en) |
WO (1) | WO2014035806A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111601972B (en) * | 2018-01-19 | 2022-09-23 | 概创机械设计有限责任公司 | Turbine with separate collectors |
CN115199587A (en) * | 2022-09-07 | 2022-10-18 | 中国核动力研究设计院 | Diffuser for compressor and compressor |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1307113A (en) * | 1961-11-29 | 1962-10-19 | L J Gilchrist & Co Engineers L | Improvement in blowers or centrifugal vane wheels |
US4770605A (en) * | 1981-02-16 | 1988-09-13 | Mitsubishi Jukogyo Kabushiki Kaisha | Diffuser device in a centrifugal compressor and method for manufacturing the same |
DE102007023915A1 (en) * | 2006-06-09 | 2007-12-13 | Borgwarner Inc., Auburn Hills | Exhaust gas turbo charger, has adjustment ring with adjustment units, where ring is rotatably supported at compressor rear wall using rolling element, and adjustment units are arranged axle centrically to rolling element |
US20100150701A1 (en) * | 2007-06-26 | 2010-06-17 | Borgwarner Inc. | Variable geometry turbocharger |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4531356A (en) * | 1981-06-15 | 1985-07-30 | The Garrett Corporation | Intake vortex whistle silencing apparatus and methods |
-
2012
- 2012-08-31 US US13/601,352 patent/US20140064933A1/en not_active Abandoned
-
2013
- 2013-08-23 EP EP13759369.5A patent/EP2890898A1/en not_active Withdrawn
- 2013-08-23 RU RU2015107885A patent/RU2015107885A/en not_active Application Discontinuation
- 2013-08-23 WO PCT/US2013/056328 patent/WO2014035806A1/en active Application Filing
- 2013-08-23 CN CN201380051296.3A patent/CN104755768A/en active Pending
- 2013-08-23 BR BR112015004608A patent/BR112015004608A2/en not_active IP Right Cessation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1307113A (en) * | 1961-11-29 | 1962-10-19 | L J Gilchrist & Co Engineers L | Improvement in blowers or centrifugal vane wheels |
US4770605A (en) * | 1981-02-16 | 1988-09-13 | Mitsubishi Jukogyo Kabushiki Kaisha | Diffuser device in a centrifugal compressor and method for manufacturing the same |
DE102007023915A1 (en) * | 2006-06-09 | 2007-12-13 | Borgwarner Inc., Auburn Hills | Exhaust gas turbo charger, has adjustment ring with adjustment units, where ring is rotatably supported at compressor rear wall using rolling element, and adjustment units are arranged axle centrically to rolling element |
US20100150701A1 (en) * | 2007-06-26 | 2010-06-17 | Borgwarner Inc. | Variable geometry turbocharger |
Also Published As
Publication number | Publication date |
---|---|
US20140064933A1 (en) | 2014-03-06 |
BR112015004608A2 (en) | 2018-04-17 |
CN104755768A (en) | 2015-07-01 |
EP2890898A1 (en) | 2015-07-08 |
RU2015107885A (en) | 2016-10-20 |
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