CN102734041A - Tangential turbine runner - Google Patents
Tangential turbine runner Download PDFInfo
- Publication number
- CN102734041A CN102734041A CN2012101667808A CN201210166780A CN102734041A CN 102734041 A CN102734041 A CN 102734041A CN 2012101667808 A CN2012101667808 A CN 2012101667808A CN 201210166780 A CN201210166780 A CN 201210166780A CN 102734041 A CN102734041 A CN 102734041A
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- Prior art keywords
- bucket
- runner
- leaf
- width
- blade
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/50—Hydropower in dwellings
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Hydraulic Turbines (AREA)
Abstract
The invention discloses a tangential turbine runner comprising a runner shaft and bucket blades which are uniformly arranged on the circumference of the runner shaft. The quantity of the bucket blades is obtained by the formula that the radial length L of each bucket blade is equal to (2.2-2.5)d0 and is reduced by 10%-15% compared with the radial length of the regular bucket blade; the width B of each bucket blade is equal to (2.8-3.2)d0 and is increased by 9%-11% compared with the width of the regular bucket blade; the depth T of each bucket blade is equal to (0.95-1.15)d0 and is increased by 4%-6% compared with the depth of the regular bucket blade; and the root thickness X of each bucket blade is equal to (0.5-0.8)B. According to the tangential turbine runner disclosed by the invention, parameters of the radial length, the width and the depth of each blade bucket are changed, the root thickness of each bucket blade is increased, and the quantity of the bucket blades is calculated according to the researched bucket blade quantity determining formula, so that the nozzle quantity, the jet flow and the flowing inside the runner do not interfere with one another, and reflowing does not exist in the root part region of each bucket blade. The hydraulic loss is greatly reduced and the output power of a set is greatly improved; and the model hydraulic efficiency of the tangential turbine runner with the bucket blade structure is detected to reach 91.66%, which the highest efficiency value of the current same-type runners at home and abroad.
Description
Technical field
The present invention uses the water conservancy and hydropower Machine Design to make the field, especially belongs to impulse turbine and manufactures and designs the field, particularly the manufacturing and designing of tangential wheel runner in the impulse turbine.
Background technique
In the impulse turbine tangential wheel have simple in structure, suitable water head height, install elevation do not receive the cavitation corrosion condition restriction, to advantages such as changes in flow rate are insensitive; Obtained using widely in the waterpower resourses exploitation high at heads such as the upper reaches, rivers and creeks, mountain areas, that flow is little, its unit power output, use head are constantly increasing.
In recent years, the efficient of new tangential wheel improved constantly with exerting oneself, and the head of application also increases greatly, and the working stress of bucket root obviously increases, and its safety coefficient is reduced.Compare with the reaction turbine runner; The bucket of impulse turbine is worked under varying duty; The impact that bucket whenever receives a jet all is equivalent to stand the primary stress circulation, and its bucket root receives the effect of a kind of asymmetrical alternation pulsating stress when each operating mode running.The bucket root is complex-shaped in addition, the space is narrow and small, and varied in thickness is big, is easy to generate stress and concentrates and fault in material; And defective is difficult for thoroughly removing; Make the fatigue ruption of tangential wheel mainly occur in the root of runner bucket, and, cause great malicious event rapidly to internal extended.
Existing in recent years scholar has carried out digital control processing after the impact type waterturbine wheel solid forging, guarantees the molded lines and the tolerance of size of bucket, guarantees its hydraulic performance, prevents disconnected bucket phenomenon, prolongs the working life of runner; Adopt the CFD method that the multi-jet turbine runner is carried out flow field analysis and jet interference research; Adopt Ansys software to the bucket stress and the shape research of shaking, obtained stress distribution and the stress value point of bucket conclusion at the cutting edge place.
As far as tangential wheel, the main destruction of runner is that cavitation corrosion and fatigue crack cause.Cavitation corrosion causes vibration and noise, forces the frequent overhaul of unit, the efficient that greatly reduces runner with exert oneself; Fatigue crack often appears at runner bucket blade root portion; For remedying bucket blade root portion strength deficiency, new designing technique, material and technology constantly are applied to the design and the manufacturing of impact type runner, how under the prerequisite that ensures the runner performance index; Requirement of strength in conjunction with runner bucket blade root portion; Accurately prediction runner stress distribution is optimized runner bucket blade root portion's molded lines and structure targetedly, sets up runner threedimensional model accurately; Make bucket reach the purpose of digital control processing fully, become current tangential wheel runner design, make urgent problem.
The structural parameter of common tangential wheel runner bucket leaf are: radial length L=(2.4-2.9) d of bucket leaf
0, the d of width B=(2.6-3.1) of bucket leaf
0, degree of depth T=(0.9-1.1) d
0, d
0Be jet diameter.Literature research such as MIROSLAV doctor NECHLEBA that nineteen fifty-seven Czechoslovakia ARTIA Prague publishing house publishes " water turbine design and equipment " relation of rotary wheel of water turbine structural parameter, each structural parameter of rotary wheel of water turbine are relevant with jet diameter.
In the tangential wheel rotor design,, further optimize runner bucket blade root portion waterpower molded lines based on the result of intensive analysis; Improve the fluidised form that part streams is mapped to bucket blade root portion; Solve the mobile interference problem between nozzle number, jet, the runner internal flow, accomplish the optimal design of runner bucket blade profile line, guarantee the intensity and the hydraulic performance of impact type waterturbine wheel; Make that the unit operation of design is more stable, it also is that rotor design is constantly made great efforts the problem explored always that efficient is improved.
Summary of the invention
The present invention discloses a kind of tangential wheel rotaring wheel structure according to the deficiency of existing technology.The problem that the present invention will solve is to require to provide on the basis a kind of tangential wheel rotaring wheel structure according to the design of different jet situation in comprehensive rotary wheel of water turbine intensity, efficient, adaptability etc.
The present invention realizes through following technological scheme:
A kind of tangential wheel runner comprises runner shaft and evenly is arranged on the bucket leaf on the runner shaft circumference, it is characterized in that:
Bucket number of sheets Z on the said runner shaft circumference is:
Wherein, k
uBe the peripheral velocity coefficient,
Be the effluxvelocity coefficient, r is a runner name radius, and R is runner breach place radius, d
0Be jet diameter; The peripheral velocity coefficient calculates or consults relative curve through formula and obtains in design.
Radial length L=(2.2-2.5) d of said bucket leaf
0
The d of the width B of said bucket leaf=(2.8-3.2)
0
The degree of depth T=of said bucket leaf (0.95-1.15) d
0
The root thickness X=of said bucket leaf (0.5-0.8) B.
Said bucket blade radical length L relatively reduces 10%-15% with the bucket blade radical length of the tangential wheel runner of routine; With, bucket leaf width B relatively increases 9%-11% with the bucket leaf width of the tangential wheel runner of routine; With, bucket leaf degree of depth T increases 4%-6% with the bucket leaf depth ratio of the tangential wheel runner of routine.
Preferred said bucket leaf width B relatively increases by 10% with the bucket leaf width of the tangential wheel runner of routine; With, bucket leaf degree of depth T increases by 5% with the bucket leaf depth ratio of the tangential wheel runner of routine.
The structural parameter of common tangential wheel runner bucket leaf are: radial length L=(2.4-2.9) d of bucket leaf
0, the d of width B=(2.6-3.1) of bucket leaf
0, degree of depth T=(0.9-1.1) d of bucket leaf
0Patent of the present invention reduces 10%-15% with radial length that cutting of routine hit the formula runner on the radial length of bucket leaf; The width of bucket leaf increases about 10%; The degree of depth increases about 5%; Increased the specific requirement of thickness simultaneously at the root place of bucket leaf, structure of the present invention can guarantee the requirement of strength of this runner under the high head condition.
The runner of patent of the present invention is cut the formula runner of hitting with routine and is compared, and the radial length that on the radial length of bucket leaf, hits the formula runner with cutting of routine reduces 10%-15%, is L=2.4d like the radial length of routine design bucket leaf
0, the radial length of runner bucket leaf of the present invention then is L=2.2d
0The width of bucket leaf increases about 10%, and promptly the width of conventional design runner bucket leaf is B=2.6d
0, the width of runner bucket leaf of the present invention then is B=2.8d
0Equally, the degree of depth of bucket leaf increases about 5%, and promptly the degree of depth of conventional design runner bucket leaf is T=0.9d
0, the width of runner bucket leaf of the present invention then is T=0.95d
0Root place required thickness at the bucket leaf is X=(0.5-0.8) B simultaneously; So; The bucket leaf of whole runner upwards shortens from the footpath to some extent, increases to some extent on the width, and is amid a sharp increase on the degree of depth; At the certain thickness of root strict guarantee of bucket leaf, can guarantee the requirement of strength of this runner under the high head condition simultaneously.
Patent of the present invention adopts the CFD technology to carry out runner performance prediction and the intensive analysis of runner bucket leaf, based on the result of intensive analysis, further optimizes runner bucket blade root portion waterpower molded lines; Further improve the fluidised form that part streams is mapped to bucket blade root portion; Solve the mobile interference problem between nozzle number, jet, the runner internal flow, accomplish the optimal design of runner bucket blade profile line, guarantee the intensity and the hydraulic performance of impact type waterturbine wheel; Make that the unit operation of design is more stable, efficient is improved.
The influence of effluenting of bucket blade root bilge construction convection cell is bigger, and it is many more that, structure down roomy more when bucket blade root portion gone into working surface, and it is poor more that bucket blade root portion flows; There is backflow in bucket blade root portion zone; And along with the bucket leaf is accepted reducing of jet and progressively increase, even soon break away from the instantaneous of jet fully at last one leaf that struggles against, there is bump in the bucket leaf back that the fluid of bucket leaf working surface is accepted jet to the next one; The direction of its impact force is opposite with the runner sense of rotation, thereby has influence on the size of exerting oneself of unit.
Helpfulness of the present invention is: the present invention is based on the CFD analytical calculation under the strength condition; Change radial length, width and the depth parameter of bucket leaf; Suitably increase the root thickness of bucket leaf; The leaf shape of design bucket is confirmed that according to the bucket number of sheets that research draws formula calculates bucket number of sheets order, thereby can be guaranteed effectively that can there be backflow in the mobile blade root portion zone that can not interfere and struggle against between nozzle number, jet, the runner internal flow.Hydraulic loss just reduces greatly like this, and exerting oneself of unit will improve greatly; The tangential wheel runner of using bucket impeller structure of the present invention is applicable to 600-1400 meters head sections of head; The test of carrying out on the national Harbin of the model runner process Electric Co., Ltd hydraulic turbine model Laboratory Furniture; Its model hydraulic efficiency reaches 91.66%, is the peak efficiency value of at present domestic and international homotype runner.
Description of drawings
Fig. 1 is a bucket leaf plane structure schematic representation of the present invention;
Fig. 2 is a bucket leaf side structure schematic representation of the present invention;
Fig. 3 is that bucket leaf jet stream of the present invention is to schematic representation;
Fig. 4 is that conventional bucket leaf jet stream is to schematic representation.
Embodiment
Through embodiment the present invention is carried out concrete description below; Present embodiment only is used for the present invention is further explained; But can not be interpreted as the restriction to protection domain of the present invention, those skilled in the art can make the scope that some nonessential improvement and adjustment belong to the present invention's protection according to the content of the invention described above.
In conjunction with Fig. 1 to Fig. 4.
Bucket number of sheets Z on the runner shaft circumference of the present invention is:
Wherein, k
uBe the peripheral velocity coefficient,
Be the effluxvelocity coefficient, r is a runner name radius, and R is runner breach place radius, d
0Be jet diameter;
Radial length L=(2.2-2.5) d of said bucket leaf
0
The d of the width B of said bucket leaf=(2.8-3.2)
0
The degree of depth T=of said bucket leaf (0.95-1.15) d
0
The root thickness X=of said bucket leaf (0.5-0.8) B.
Fig. 1 is a bucket leaf plane structure schematic representation of the present invention; Fig. 2 is a bucket leaf side structure schematic representation of the present invention.Among the figure, d
0Be jet diameter, L is the radial length of bucket leaf, and B is the width of bucket leaf, and T is the degree of depth of bucket leaf, and X is the root thickness of bucket leaf, and D is the nominal diameter of runner.
Fig. 3 be bucket leaf jet stream of the present invention to schematic representation, Fig. 4 is that conventional bucket leaf jet stream is to schematic representation.The direction of arrow among the figure be bucket leaf jet stream to.As shown in Figure 3, experiment showed, that according to CFD analysis and platform can there be backflow in the mobile blade root portion zone that can not interfere and struggle against between its runner internal flow of bucket impeller structure of adopting parameter of the present invention.As shown in Figure 4, the conventional blade root portion zone of struggling against exists refluxes, and hydraulic loss has influenced unit output greater than bucket impeller structure of the present invention, and L ' is the radial length of the conventional leaf that struggles against among Fig. 4, and B ' is the width of conventional bucket leaf, and X ' is the root thickness of conventional bucket leaf.
The runner of patent of the present invention is cut the formula runner of hitting with routine and is compared, and confirms identical jet diameter d
0, the radial length that on the radial length of bucket leaf, hits the formula runner with cutting of routine reduces 10%-15%, is L=2.4d like the radial length of routine design bucket leaf
0, the radial length of runner bucket leaf so of the present invention then is L '=2.2d
0The width of bucket leaf increases about 10%, and promptly the width of conventional design runner bucket leaf is B=2.6d
0, the width of runner bucket leaf so of the present invention then is B '=2.8d
0Simultaneously, the degree of depth of bucket leaf increases about 5%, and promptly the degree of depth of conventional design runner bucket leaf is T=0.9d
0, the width of runner bucket leaf so of the present invention then is T '=0.95d
0Having increased thickness at the root place of bucket leaf simultaneously is the specific requirement of X=(0.5-0.8) B; So; The bucket leaf of whole runner upwards shortens from the footpath to some extent, increases to some extent on the width, and is amid a sharp increase on the degree of depth; The colleague can guarantee the requirement of strength of this runner under the high head condition at the certain thickness of root strict guarantee of bucket leaf.
The present invention is based on the CFD analytical calculation under the strength condition; Change radial length, width and the depth parameter of bucket leaf; Suitably increase the root thickness of bucket leaf; The leaf shape of design bucket is confirmed that according to the bucket number of sheets that research draws formula calculates bucket number of sheets order, thereby can be guaranteed effectively that can there be backflow in the mobile blade root portion zone that can not interfere and struggle against between nozzle number, jet, the runner internal flow.Hydraulic loss just reduces greatly like this, and exerting oneself of unit will improve greatly; The tangential wheel runner of using bucket impeller structure of the present invention is applicable to 600-1400 meters head sections of head; The test of carrying out on the national Harbin of the model runner process Electric Co., Ltd hydraulic turbine model Laboratory Furniture; Its model hydraulic efficiency reaches 91.66%, is the peak efficiency value of at present domestic and international homotype runner.
Claims (3)
1. a tangential wheel runner comprises runner shaft and evenly is arranged on the bucket leaf on the runner shaft circumference, it is characterized in that:
Bucket number of sheets Z on the said runner shaft circumference is:
Wherein, k
uBe the peripheral velocity coefficient,
Be the effluxvelocity coefficient, r is a runner name radius, and R is runner breach place radius, d
0Be jet diameter;
Radial length L=(2.2-2.5) d of said bucket leaf
0
The d of the width B of said bucket leaf=(2.8-3.2)
0
The degree of depth T=of said bucket leaf (0.95-1.15) d
0
The root thickness X=of said bucket leaf (0.5-0.8) B.
2. tangential wheel runner according to claim 1 is characterized in that: said bucket blade radical length L relatively reduces 10%-15% with the bucket blade radical length of the tangential wheel runner of routine; With, bucket leaf width B relatively increases 9%-11% with the bucket leaf width of the tangential wheel runner of routine; With, bucket leaf degree of depth T increases 4%-6% with the bucket leaf depth ratio of the tangential wheel runner of routine.
3. tangential wheel runner according to claim 2 is characterized in that: preferred said bucket leaf width B relatively increases by 10% with the bucket leaf width of the tangential wheel runner of routine; With, bucket leaf degree of depth T increases by 5% with the bucket leaf depth ratio of the tangential wheel runner of routine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101667808A CN102734041A (en) | 2012-05-25 | 2012-05-25 | Tangential turbine runner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101667808A CN102734041A (en) | 2012-05-25 | 2012-05-25 | Tangential turbine runner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102734041A true CN102734041A (en) | 2012-10-17 |
Family
ID=46990174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101667808A Pending CN102734041A (en) | 2012-05-25 | 2012-05-25 | Tangential turbine runner |
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| Country | Link |
|---|---|
| CN (1) | CN102734041A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104636550A (en) * | 2015-02-03 | 2015-05-20 | 哈尔滨电机厂有限责任公司 | Method for optimizing the structure of root portion of water distribution blade of bucket of impulse water turbine |
| CN106593746A (en) * | 2017-01-23 | 2017-04-26 | 成都天府新区河川科技有限公司 | Blade and water turbine |
| CN114997084A (en) * | 2022-08-01 | 2022-09-02 | 浙江大学 | Method for optimizing bucket blade profile of impulse turbine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2249719C2 (en) * | 1999-12-10 | 2005-04-10 | Альстом Пауэр Хидро | Method of assembling working wheel of pelton turbine |
| WO2010130902A2 (en) * | 2009-05-12 | 2010-11-18 | Societe Civile De Gestion Fff | Blade wheel for large water depths |
| CN202579008U (en) * | 2012-05-25 | 2012-12-05 | 西华大学 | Runner structure of tangential turbine |
-
2012
- 2012-05-25 CN CN2012101667808A patent/CN102734041A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2249719C2 (en) * | 1999-12-10 | 2005-04-10 | Альстом Пауэр Хидро | Method of assembling working wheel of pelton turbine |
| WO2010130902A2 (en) * | 2009-05-12 | 2010-11-18 | Societe Civile De Gestion Fff | Blade wheel for large water depths |
| WO2010130902A4 (en) * | 2009-05-12 | 2011-06-23 | Societe Civile De Gestion Fff | Blade wheel for large water depths |
| CN202579008U (en) * | 2012-05-25 | 2012-12-05 | 西华大学 | Runner structure of tangential turbine |
Non-Patent Citations (1)
| Title |
|---|
| 杨佐卫: "多喷嘴冲击式水轮机转轮的三维建模与强度分析", 《多喷嘴冲击式水轮机转轮的三维建模与强度分析》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104636550A (en) * | 2015-02-03 | 2015-05-20 | 哈尔滨电机厂有限责任公司 | Method for optimizing the structure of root portion of water distribution blade of bucket of impulse water turbine |
| CN106593746A (en) * | 2017-01-23 | 2017-04-26 | 成都天府新区河川科技有限公司 | Blade and water turbine |
| CN114997084A (en) * | 2022-08-01 | 2022-09-02 | 浙江大学 | Method for optimizing bucket blade profile of impulse turbine |
| CN114997084B (en) * | 2022-08-01 | 2022-12-13 | 浙江大学 | Bucket blade profile optimization method for impulse turbine |
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Application publication date: 20121017 |