CN106523437A - Novel diffuser for centrifugal compressor - Google Patents
Novel diffuser for centrifugal compressor Download PDFInfo
- Publication number
- CN106523437A CN106523437A CN201611191253.7A CN201611191253A CN106523437A CN 106523437 A CN106523437 A CN 106523437A CN 201611191253 A CN201611191253 A CN 201611191253A CN 106523437 A CN106523437 A CN 106523437A
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- CN
- China
- Prior art keywords
- diffuser
- section
- diffuser body
- centrifugal compressor
- hole section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000009792 diffusion process Methods 0.000 claims abstract description 29
- 206010022000 influenza Diseases 0.000 claims description 3
- 230000035939 shock Effects 0.000 abstract description 3
- 230000006835 compression Effects 0.000 abstract description 2
- 238000007906 compression Methods 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000001727 in vivo Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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
- F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
Abstract
The invention discloses a novel diffuser for a centrifugal compressor, and belongs to the technical field of compression equipment. The novel diffuser for the centrifugal compressor comprises a disc-shaped diffuser body, and a plurality of diffusion air ducts are evenly arranged on the circumference of the diffuser body. The novel diffuser is characterized in that the diffusion air ducts are continuously arranged outwards from the center of the diffuser body and penetrate through cylindrical hole sections and conical hole sections of the diffuser body; each cylindrical hole section and the corresponding conical hole section are connected end to end and share the common axis; and every two adjacent cylindrical hole sections intersect on the inner side of the diffuser body, so that a sharp oval front edge and a cylindrical throat section behind the sharp oval front edge are formed. According to the novel diffuser for the centrifugal compressor, the diffusion air ducts intersect to form the sharp oval front edge, and the front edge is sharp so that shock wave loss caused by the excessively high flow speed in front of the diffuser can be well avoided, and the pneumatic performance of the high-pressure-ratio compressor is improved.
Description
Technical field
The invention belongs to compression device technical field, and in particular to a kind of new diffuser for centrifugal compressor.
Background technology
With a kind of continuous extensive, the turbomachine product of the compressor as core of modern turbomachine range of application,
The pressure ratio of its demand also more and more higher.With the raising of pressure ratio, the flow velocity inside compressor is also gradually improved to super by subsonic speed
The velocity of sound, also transitions into subsonic and transonic flows in the entrance of diffuser.For transonic diffuser, traditional diffuser is in pneumatic property
Can on occur, now, find a kind of diffuser that can preferably match subsonic and transonic flows, with
The aeroperformance for improving high pressure ratio compressor seems particularly necessary.
The content of the invention
In view of this, it is an object of the invention to provide a kind of new diffuser of centrifugal compressor, by the expansion of gradual change
Opening circular cone makes air-flow streamwise slow down so as to realize diffusion, improves the aeroperformance of high pressure ratio compressor.
To reach above-mentioned purpose, the present invention provides following technical scheme：
A kind of new diffuser for centrifugal compressor, including disc-shaped diffuser body, the diffuser body
Multiple diffusion air flues are evenly arranged with circumferentially, the diffusion air flue includes being arranged continuously out simultaneously by diffuser body central
Through the cylinder hole section and circular cone hole section of diffuser body, cylinder hole section and circular cone hole section it is end to end, and with public axle
Line, it is intersecting in diffuser body inboard portion between adjacent column hole section, form a sharp ellipse leading edge and behind one section
Cylindrical aditus laryngis section.
Further, the common axis is arranged in angle with radial line.
The beneficial effects of the present invention is：
The diffusion air flue of the present invention is made up of cylinder hole section and circular cone hole section, and in diffuser sheet between adjacent column hole section
Sidepiece split-phase is handed in vivo, forms a sharp ellipse leading edge and one section of cylindrical aditus laryngis section.Due to leading edge it is more sharp, therefore can very well
Avoid due to the too high and caused shock loss of flow velocity before diffuser；Simultaneously because its whole passage is in radius cross-wise direction
All it is circular configuration, which will not produce the angle whirlpool as traditional diffuser.The diffuser is relative to traditional wing diffusion
Device or channel type diffuser, its efficiency are advantageous, and it is higher to be particularly suited for pressure ratio, higher to efficiency requirements, and surge margin is not had
In having the too transonic speed or sueprsonic compressor of high request.
Other advantages of the present invention, target and feature will be illustrated to a certain extent in the following description, and
And to a certain extent, based on being will be apparent to investigating hereafter to those skilled in the art, Huo Zheke
To be instructed from the practice of the present invention.The present invention target and other advantages can be realized by description below and
Obtain.
Description of the drawings
In order that the purpose of the present invention, technical scheme and beneficial effect are clearer, the present invention provides drawings described below and carries out
Explanation：
Fig. 1 is the tomograph of the present invention；
Fig. 2 is sectional view of the present invention on the high direction of 50% leaf；
Enlarged drawings of the Fig. 3 for diffusion air flue.
Specific embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
As shown in Figure 1, 2, 3, a kind of new diffuser for centrifugal compressor in the present embodiment, including it is disc-shaped
Diffuser body 10, diffuser body are circumferentially evenly arranged with multiple diffusion air flues 11, and diffusion air flue is included by diffuser
Body central is arranged continuously out and through the cylinder hole section 12 and circular cone hole section 13 of diffuser body, cylinder hole section and conical bore
Section is end to end, and with public axis, between adjacent column hole section on the inside of diffuser body, i.e., near impeller outlet side
Part is intersecting, impeller outlet radius, forms a sharp oval leading edge 5 and one section of cylindrical aditus laryngis section 7, the friendship of oval leading edge
Boundary side, as diffuser leading edge line 4, as leading edge is three-dimensional structure, in the flex point that the high direction of 50% leaf is leading edge, the point is referred to as
Leading edge summit 2, and the line on the radial direction of the apex is the leading-edge radius line 6 of the diffuser, i.e., from the radial direction,
Air-flow is completely into carrying out flowing diffusion in diffuser.It is cylindrical aditus laryngis section 7 after leading-edge radius line, which is predominantly cylindrical
Equal cloth hole constitute, its main design parameter has：Body diameter, the aditus laryngis length (length of leading-edge radius line and aditus laryngis outlet section
Degree), established angle (axial line of cylinder with the angle of radial line) and quantity.Be connected with cylindrical 7 rear portion of aditus laryngis section for cone
Diffuser 8, this section are uniformly formed in circumferencial direction by the circular cone with certain taper, the axial line of its axial line and aditus laryngis section cylinder
Identical, its main design parameter has：The angle of flare (and taper of cone) and diffusion length (length of import to trailing edge).Separately
Outer two parameters：Established angle and quantity are consistent with cylindrical aditus laryngis section.In the outlet of conical diffuser 8, which can be annular with one
Section is crossed to form the trailing edge of the diffuser, and the radial location residing for trailing edge is outlet trailing edge radius line 9.
In the present embodiment, common axis is arranged in angle with radial line, i.e., established angle is not zero.
The new diffuser mainly use fluid cone passage diffusion in flow losses it is less, static pressure reply system
Number is a new diffuser that the characteristics of diffusion ability is bigger is designed.
Specifically, when fluid is flowed out from impeller outlet, which is first by one section of oval leading edge without leaf diffusion region
Part diffusion and blending are carried out, makes air current flow average, cylindrical aditus laryngis section is entered by oval leading edge again then, now gas
Stream is changed into the flowing in multiple cylindrical channels in the flowing of an anchor ring.
Due to its special structure form of oval leading edge, its thickness is very thin and sharp for the diffuser, such air-flow with it is front
After edge contact, the circulation area change of air-flow is less and very little in the change of oval leading edge flow angle, will not produce tradition
Caused by diffuser leading edge, gas flows through acceleration and the obstruction that circulates, and especially transonic speed or in supersonic flows, can keep away well
Exempt from due to shock loss caused by the reason institute；And as channel shape is a cylinder, be a circle in radius cross-wise direction
Shape, different from the rectangle of the diffuser of traditional type, so as to produce in the angle whirlpool produced by edge, thus greatly
Reduce whole diffusion flowing in vorticity, reduce flow losses, improve efficiency.As cylindrical aditus laryngis section 7 is whole
Area in individual diffuser is minimum, therefore which is the restricted section of diffuser, is typically also the restricted section of whole compressor, therefore at this
The flow of compressor is determined directly.
After air-flow enters conical diffuser 8, due to aisle spare along radial direction being continuously increased, therefore gas velocity
Degree begins to decline, and pressure constantly rises, so as to realize diffusion.The speed of area change rate decision diffusion, and area change rate
It is related to the angle of flare, therefore in order to improve diffusion speed, can be realized by improving the angle of flare.But due to the stream in diffuser
It is stronger adverse pressure gradient flowing to move, therefore is easy to produce separation, if the angle of flare is excessive, flowing can be too big due to adverse pressure gradient
So as to produce separation, therefore the angle of flare need to reasonably be selected according to the situation of compressor, in general, the angle of flare is less, be imitated
Rate is higher, but diffusion ability is relatively low.In order to ensure to remain to reach corresponding diffusion ability under the rational angle of flare, need to be by changing
Become diffusion length to realize.Typically, since the restriction of the angle of flare, often makes the diffusion length of diffuser longer, so as to
Cause the type diffuser be slightly larger than traditional diffuser in the size of radial direction.
Pluses and minuses are summarized.
Compared with traditional diffuser, which has special architectural feature, and result in distinctive flow performance.Ellipse
Circle edge, which is without due to mismatching to flow caused extraneoas loss, therefore which has a higher pneumatic efficiency, but
Under Study on Variable Condition Features, as more sharp leading edge can cause the applicability to variable working condition poor, cause which in non-oval leading edge
Efficiency can be low, and after leading edge is deviateed easily forms larger separation whirlpool so that diffuser stall, so as to its surge margin more
It is low.In addition, traditional diffuser is required for being engaged to form diffusion passage with diffuser case, can thus be formed between leaf top
Gap, so as to cause flow losses, and the diffuser is the diffusion air flue that an independent part is constituted, and is not existed between the type
Gap, therefore do not deposit flow losses in this section yet.
To sum up, it is to possess higher efficiency in oval edge the characteristics of the new diffuser, but surge margin is lower,
Range of flow is less.
Meanwhile, the new diffuser is easier to realize in processing, and circumferential beating predominantly is carried out in an annulus solid blank
Hole, then coordinate certain turning operation complete, it is not required to carry out standard using the NC Milling Technology as traditional diffuser
True molded line control, but due to the general unnecessary traditional diffuser of its port number, therefore difference is simultaneously little in processing cost.
Finally illustrate, preferred embodiment above is only unrestricted to illustrate technical scheme, although logical
Cross above preferred embodiment to be described in detail the present invention, it is to be understood by those skilled in the art that can be
Various changes are made to which in form and in details, without departing from claims of the present invention limited range.
Claims (2)
1. a kind of new diffuser for centrifugal compressor, including disc-shaped diffuser body, the diffuser body exist
Multiple diffusion air flues are evenly arranged with circumference, it is characterised in that：The diffusion air flue includes outside by diffuser body central
Continuous to arrange and through the cylinder hole section and circular cone hole section of diffuser body, cylinder hole section and circular cone hole section are end to end, and have
Have public axis, it is intersecting in diffuser body inboard portion between adjacent column hole section, formed a sharp ellipse leading edge and
Thereafter the cylindrical aditus laryngis section of one section.
2. a kind of new diffuser for centrifugal compressor according to claim 1, it is characterised in that：The common axis
Line is arranged in angle with radial line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611191253.7A CN106523437A (en) | 2016-12-21 | 2016-12-21 | Novel diffuser for centrifugal compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611191253.7A CN106523437A (en) | 2016-12-21 | 2016-12-21 | Novel diffuser for centrifugal compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106523437A true CN106523437A (en) | 2017-03-22 |
Family
ID=58340781
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611191253.7A Pending CN106523437A (en) | 2016-12-21 | 2016-12-21 | Novel diffuser for centrifugal compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106523437A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109611346A (en) * | 2018-11-30 | 2019-04-12 | 中国航发湖南动力机械研究所 | Centrifugal compressor and its design method |
| CN112922861A (en) * | 2021-01-29 | 2021-06-08 | 西安交通大学 | Compact low-rotation-speed centrifugal compressor |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3604818A (en) * | 1969-12-10 | 1971-09-14 | Avco Corp | Centrifugal compressor diffuser |
| US3743436A (en) * | 1971-07-13 | 1973-07-03 | Avco Corp | Diffuser for centrifugal compressor |
| US4012166A (en) * | 1974-12-04 | 1977-03-15 | Deere & Company | Supersonic shock wave compressor diffuser with circular arc channels |
| US5131142A (en) * | 1990-10-30 | 1992-07-21 | Carrier Corporation | Method of making pipe diffuser structure |
| CN103629157A (en) * | 2013-11-27 | 2014-03-12 | 中国航天科技集团公司第六研究院第十一研究所 | Guide for pumps |
| CN104500452A (en) * | 2014-12-16 | 2015-04-08 | 中国科学院工程热物理研究所 | Vaneless diffusion section structure with regular N-prism side outlet and machining method |
-
2016
- 2016-12-21 CN CN201611191253.7A patent/CN106523437A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3604818A (en) * | 1969-12-10 | 1971-09-14 | Avco Corp | Centrifugal compressor diffuser |
| US3743436A (en) * | 1971-07-13 | 1973-07-03 | Avco Corp | Diffuser for centrifugal compressor |
| US4012166A (en) * | 1974-12-04 | 1977-03-15 | Deere & Company | Supersonic shock wave compressor diffuser with circular arc channels |
| US5131142A (en) * | 1990-10-30 | 1992-07-21 | Carrier Corporation | Method of making pipe diffuser structure |
| CN103629157A (en) * | 2013-11-27 | 2014-03-12 | 中国航天科技集团公司第六研究院第十一研究所 | Guide for pumps |
| CN104500452A (en) * | 2014-12-16 | 2015-04-08 | 中国科学院工程热物理研究所 | Vaneless diffusion section structure with regular N-prism side outlet and machining method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109611346A (en) * | 2018-11-30 | 2019-04-12 | 中国航发湖南动力机械研究所 | Centrifugal compressor and its design method |
| CN109611346B (en) * | 2018-11-30 | 2021-02-09 | 中国航发湖南动力机械研究所 | Centrifugal compressor and design method thereof |
| CN112922861A (en) * | 2021-01-29 | 2021-06-08 | 西安交通大学 | Compact low-rotation-speed centrifugal compressor |
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| C06 | Publication | ||
| PB01 | Publication | ||
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170322 |
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