CN108019237A - A kind of bionical blade profile of steam turbine for suppressing flow separation - Google Patents
A kind of bionical blade profile of steam turbine for suppressing flow separation Download PDFInfo
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- CN108019237A CN108019237A CN201711219592.6A CN201711219592A CN108019237A CN 108019237 A CN108019237 A CN 108019237A CN 201711219592 A CN201711219592 A CN 201711219592A CN 108019237 A CN108019237 A CN 108019237A
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- steam turbine
- blade profile
- blade
- flow separation
- smooth
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/14—Form or construction
- F01D5/141—Shape, i.e. outer, aerodynamic form
- F01D5/145—Means for influencing boundary layers or secondary circulations
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Control Of Turbines (AREA)
Abstract
The invention discloses a kind of bionical blade profile of steam turbine for suppressing flow separation, realized by being designed on the basis of original blade profile leading edge repairing type, edge control line is equipped with the smooth projection that multiple height are d in front of the blade, smooth projection uses radius to be seamlessly transitted for the sphere of r with blade inlet edge surface, which is l, a height of h of leaf.In power station steam turbine band operation at part load, blade is under negative angle of attack state and works, the smooth projection blade profile of imitation biochemistry can apply fluid more disturbances, promote energy exchange between fluid and mainstream fluid in leaf grating leading edge separated region, accelerate fluid attaching process again, so as to suppress the phenomenon that negative angle of attack causes pressure face flow separation, efficiency and security of the blade profile in variable working condition are improved.
Description
Technical field
The invention belongs to electrical circuitry equipment manufacture and energy-saving and emission-reduction field, it is related to a kind of power station steam turbine blade profile, and in particular to
A kind of bionical blade profile of steam turbine for suppressing flow separation.
Background technology
In the end of the year 2016, in China's capacity of installed generator, thermal power generation unit and nuclear energy power generation unit account for about 66.32%,
These units are all using steam turbine as prime mover.For coordinate peak load regulation network operation, Large-scale fire-electricity unit have to often in
Varying duty state is run；To coordinate the access of regenerative resource, nuclear power generating sets even also face the demand of peak regulation.As power station
Energy conversion key device, steam turbine performance especially variable working condition when performance have to the economy and security in power plant
Tremendous influence.Therefore, efficiency and its security of the large-size steam turbine under variable parameter operation state are improved, to lifting Chinese large-sized
The autonomous Design and manufacturing capacity of power-equipment have important practical significance.At the same time, bionical Airfoil Design is in the ascendant,
Its application on the outflow hydrodynamics component such as rudder for ship, aircraft wing, fan blade has good result, is that current hot topic is ground
Study carefully problem.However, existing literature has no the application of bionical aerofoil profile flow device in power station steam turbine etc..
The content of the invention
For above-mentioned background present situation, the purpose of the present invention is devise a kind of power station steam turbine leaf based on bionics principle
Type, steam flow flow separation during by suppressing variable parameter operation, so as to improve the efficiency and its security of large-size steam turbine.
Another object of the present invention is to provide one kind and carries out the improved method of imitation biochemistry to existing steam turbine blade profile, can solve
Existing steam turbine blade profile the problem of efficiency is relatively low under varying load condition.
To achieve the above object, the technical solution adopted by the present invention is as follows：
A kind of bionical blade profile of steam turbine for suppressing flow separation, it is characterised in that：Edge control line is equipped with more in front of the blade
A height is the smooth projection of d, and smooth projection uses radius to be seamlessly transitted for the sphere of r with blade inlet edge surface, which puts down
Equal chord length is l, a height of h of leaf.
As an improvement, the smooth rising height d meets that 3%l≤d≤8%l, smooth projection spacing m meet 3%h≤m
≤ 12%h.
As an improvement, the smooth tangent connection of circular arc that radius of curvature r is used between projection and leading edge control line, is formed new
Leading edge control line, radius of curvature r meet 7%l≤r≤20%l.
As an improvement, smooth projection and the spherical radius r of blade surface smooth blend meet 7%l≤r≤20%l.
As an improvement, multiple smooth projections are uniformly distributed on edge control line in front of the blade.
The beneficial effects of the invention are as follows：
The present invention uses for reference the protrusion of the biological fin leading edge of whale etc. in natural environment on the basis of existing steam turbine blade profile
Shape structure, by carrying out imitation biochemistry design to blade inlet edge, so as to reach the mesh of steam flow flow separation when suppressing variable parameter operation
's.Due to without significantly being adjusted to existing blade profile, with the R＆D cycle is short, cost is low, with prophyll type security feature phase
Like etc. advantage.Simplation verification improves blade profile in low- load conditions by delaying flow separation the results show that opposite prophyll type
Occur, so as to reach the internal efficiency ratio of higher.
Brief description of the drawings
Fig. 1 is the bionical leaf structure schematic diagram of steam turbine of the present invention.
Fig. 2 is that size annotates schematic diagram in the bionical blade profile of steam turbine of the present invention.
Fig. 3 is specific embodiment of the invention Central Plains blade profile cascade flow field schematic diagram.
Fig. 4 is the bionical blade profile cascade flow field schematic diagram of steam turbine that bionics principle is used in the specific embodiment of the invention 1.
1- trailing edge control lines, 2- leading edge control lines, the smooth projections of 3-, 4- blades.
Embodiment
Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described.
Embodiment 1：
Present embodiment provides a kind of bionical blade profile of steam turbine for suppressing flow separation, this blade profile is by trailing edge control line
1st, leading edge control line 2 and smooth projection 3 are formed.
As depicted in figs. 1 and 2, it is the local leaf structure schematic diagram of blade 4 in Fig. 1, in schematic diagram, is in mean chord
Several smooth projections, smooth rising height d=5%l, smooth projection are evenly arranged on the steam turbine blade profile leading edge control line of l
Between spacing m=10%h, the tangent connection of circular arc of radius of curvature r=10%l is used between smooth projection and leading edge control line,
Form new leading edge control line.It is same to use radius of curvature r=10%l's to make smooth projection and leaf grating smooth surface transition
Sphere closes the region.
By the bionical blade profile of steam turbine of the present invention in power station steam turbine band operation at part load, blade is in negative angle of attack state
Lower work, the smooth projection blade profile of imitation biochemistry can apply fluid more disturbances, promote in leaf grating leading edge separated region fluid with
Energy exchange between mainstream fluid, accelerates fluid attaching process again, so that suppress the phenomenon that negative angle of attack causes pressure face flow separation,
Improve efficiency and security of the blade profile in variable working condition.
Fig. 3 and Fig. 4 is respectively the high section cascade flow of prophyll type and bionics principle blade profile 50% leaf in 12.5% load
Field schematic diagram, the mechanism of flow separation is illustrated when this two width figure suppresses variable parameter operation to bionics blade profile.From Fig. 3 with
And can see in Fig. 4, under 12.5% load condition, since negative angle of attack is excessive, there is stream in leaf grating pressure face leading edge
The separated region that body can not adhere to.Difference is that Fig. 3 Central Plains blade profile pressure face leading edge separated region shows enclosed separation
The characteristics of, fluid and external fluid quality, momentum-exchange are less in separated region, therefore rarer streamline is extended into this region
Portion；And the quality momentum between fluid and the external world in separated region is strengthened since bionical blade profile is to the perturbation action of fluid in Fig. 4
Exchange so that fluid can faster obtain energy and be attached to blade surface again in separated region, and then improve flow efficiency.Separately
On the one hand, due to the bionical leading edge design of blade profile introducing in Fig. 4, reduce due to separation vortex shedding and trigger unsteady exciting force
Possibility, and then the hidden danger of fatigue damage occurs for leaf grating during mitigation variable parameter operation, improves the security of leaf grating.
Embodiment 2：
Several smooth projections, smooth projection are evenly arranged on the steam turbine blade profile leading edge control line that mean chord is l
Height d=3%l, smooth projection spacing m=3%h, using radius of curvature r=7%l's between smooth projection and leading edge control line
The tangent connection of circular arc, forms new leading edge control line.To make smooth projection and leaf grating smooth surface transition, equally using curvature half
The sphere of footpath r=7%l closes the region.
Embodiment 3：
Several smooth projections, smooth projection are evenly arranged on the steam turbine blade profile leading edge control line that mean chord is l
Height d=12%l, smooth projection spacing m=8%h, use radius of curvature r=20%l between smooth projection and leading edge control line
The tangent connection of circular arc, form new leading edge control line.To make smooth projection and leaf grating smooth surface transition, equally using curvature
The sphere of radius r=20%l closes the region.
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology belonging to the present invention is led
The technical staff in domain can do various modifications or additions to described specific embodiment or replace in a similar way
Generation, but without departing from spirit of the invention or beyond the scope of the appended claims.
Claims (5)
- A kind of 1. bionical blade profile of steam turbine for suppressing flow separation, it is characterised in that：Edge control line is equipped with multiple in front of the blade Highly it is the smooth projection of d, smooth projection uses radius to be seamlessly transitted for the sphere of r with blade inlet edge surface, which is averaged Chord length is l, a height of h of leaf.
- A kind of 2. bionical blade profile of steam turbine for suppressing flow separation according to claim 1, it is characterised in that：It is described smooth Rising height d meets that 3%l≤d≤8%l, smooth projection spacing m meet 3%h≤m≤12%h.
- A kind of 3. bionical blade profile of steam turbine for suppressing flow separation according to claim 1, it is characterised in that：Smooth projection The tangent connection of circular arc of radius of curvature r is used between leading edge control line, forms new leading edge control line, radius of curvature r meets 7%l≤r≤20%l.
- A kind of 4. bionical blade profile of steam turbine for suppressing flow separation according to claim 1, it is characterised in that：Smooth projection Meet 7%l≤r≤20%l with the spherical radius r of blade surface smooth blend.
- A kind of 5. bionical blade profile of steam turbine for suppressing flow separation according to claim 1, it is characterised in that：It is multiple smooth Projection is uniformly distributed on edge control line in front of the blade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711219592.6A CN108019237A (en) | 2017-11-28 | 2017-11-28 | A kind of bionical blade profile of steam turbine for suppressing flow separation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711219592.6A CN108019237A (en) | 2017-11-28 | 2017-11-28 | A kind of bionical blade profile of steam turbine for suppressing flow separation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108019237A true CN108019237A (en) | 2018-05-11 |
Family
ID=62077387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711219592.6A Pending CN108019237A (en) | 2017-11-28 | 2017-11-28 | A kind of bionical blade profile of steam turbine for suppressing flow separation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111622808A (en) * | 2020-05-25 | 2020-09-04 | 武汉大学 | Bionic blade based on existing steam turbine blade profile transformation and design method |
| CN115081138A (en) * | 2022-06-22 | 2022-09-20 | 武汉大学 | Guide vane design method for improving operation stability of pump turbine and pump turbine |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB789883A (en) * | 1954-08-20 | 1958-01-29 | Power Jets Res & Dev Ltd | High speed aerofoil |
| JP2000104501A (en) * | 1998-09-28 | 2000-04-11 | Hitachi Ltd | Turbine moving blade, gas turbine and steam turbine |
| CN104114815A (en) * | 2011-12-22 | 2014-10-22 | 通用电气公司 | Airfoils and corresponding fabricating method |
| CN104612758A (en) * | 2014-12-19 | 2015-05-13 | 中国民航大学 | Low-pressure turbine blade with low loss |
| CN105626159A (en) * | 2016-03-03 | 2016-06-01 | 哈尔滨工程大学 | Variable geometry turbine with wavy concaved structures on front edges of movable blades |
| CN105298924B (en) * | 2015-10-23 | 2017-09-15 | 上海交通大学 | Compressor bionics stator blade and its implementation based on humpback flipper |
-
2017
- 2017-11-28 CN CN201711219592.6A patent/CN108019237A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB789883A (en) * | 1954-08-20 | 1958-01-29 | Power Jets Res & Dev Ltd | High speed aerofoil |
| JP2000104501A (en) * | 1998-09-28 | 2000-04-11 | Hitachi Ltd | Turbine moving blade, gas turbine and steam turbine |
| CN104114815A (en) * | 2011-12-22 | 2014-10-22 | 通用电气公司 | Airfoils and corresponding fabricating method |
| CN104612758A (en) * | 2014-12-19 | 2015-05-13 | 中国民航大学 | Low-pressure turbine blade with low loss |
| CN105298924B (en) * | 2015-10-23 | 2017-09-15 | 上海交通大学 | Compressor bionics stator blade and its implementation based on humpback flipper |
| CN105626159A (en) * | 2016-03-03 | 2016-06-01 | 哈尔滨工程大学 | Variable geometry turbine with wavy concaved structures on front edges of movable blades |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111622808A (en) * | 2020-05-25 | 2020-09-04 | 武汉大学 | Bionic blade based on existing steam turbine blade profile transformation and design method |
| CN115081138A (en) * | 2022-06-22 | 2022-09-20 | 武汉大学 | Guide vane design method for improving operation stability of pump turbine and pump turbine |
| CN115081138B (en) * | 2022-06-22 | 2024-05-31 | 武汉大学 | Guide vane design method for improving running stability of water pump turbine and water pump turbine |
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Application publication date: 20180511 |
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