CN202579008U - Runner structure of tangential turbine - Google Patents

Runner structure of tangential turbine Download PDF

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Publication number
CN202579008U
CN202579008U CN2012202413683U CN201220241368U CN202579008U CN 202579008 U CN202579008 U CN 202579008U CN 2012202413683 U CN2012202413683 U CN 2012202413683U CN 201220241368 U CN201220241368 U CN 201220241368U CN 202579008 U CN202579008 U CN 202579008U
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bucket
runner
leaf
width
bucket leaf
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宋文武
符杰
骆晓晴
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Xihua University
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Xihua University
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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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Abstract

The utility model discloses a runner structure of a tangential turbine, which includes a runner shaft and bucket wheels uniformly arranged on the periphery of the runner shaft, wherein the amount of the buckets wheels are calculated out according to the formula in the article; the radial length L of the bucket wheel is equal to (2.2-2.5)d0, which is reduced by 10%-15% as compared with the ordinary bucket wheel length; the width B of the bucket wheel is equal to (2.8-3.2)d0, which is increased by 9%-11% as compared with the ordinary bucket wheel width; the depth T of the bucket wheel is equal to (0.95-1.15)d0, which is increased by 4%-6% as compared with the ordinary bucket wheel depth; and the thickness X of the root part of the bucket wheel is equal to (0.5-0.8) B. By changing the radial length, width and the depth parameters of the bucket wheel, increasing the thickness of the root part of the bucket wheel, and determining the amount of the bucket wheels calculated out based on the formula according to the amount of the bucket wheels obtained through research, the flow in the nozzle, the jet flow and the flow inside the runner are free from the interference, and the backflow is avoided in the area of the root parts of the bucket wheels; the water power loss is greatly reduced, and the power output is greatly improved; and tests show that the hydraulic efficiency of the model of the runner structure of the tangential turbine amounts to 91.66%, which is the highest efficiency value of the similar runners at home and abroad.

Description

A kind of tangential wheel runner
Technical field
The utility model 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 utility model discloses a kind of tangential wheel rotaring wheel structure according to the deficiency of existing technology.The problem that the utility model 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 utility model is realized 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:
Figure BDA0000168663071
Wherein, k uBe the peripheral velocity coefficient,
Figure BDA0000168663072
Be the effluxvelocity coefficient, Be runner name radius,
Figure BDA0000168663074
Be 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 0The utility model patent 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, the utility model structure can guarantee the requirement of strength of this runner under the high head condition.
The runner of the utility model patent 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 the runner bucket leaf of the utility model 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 the utility model runner bucket leaf 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 the utility model runner bucket leaf 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.
The utility model patent adopts the CFD technology to carry out runner performance prediction and the intensive analysis of runner bucket leaf; Result based on intensive analysis; Further optimize 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.
The utility model helpfulness is: the utility model 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 the utility model bucket impeller structure 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 the utility model bucket leaf plane structure schematic representation;
Fig. 2 is the utility model bucket leaf side structure schematic representation;
Fig. 3 is that the utility model bucket leaf jet stream is to schematic representation;
Fig. 4 is that conventional bucket leaf jet stream is to schematic representation.
Embodiment
Through embodiment the utility model is carried out concrete description below; Present embodiment only is used for the utility model is further explained; But can not be interpreted as the restriction to the utility model protection domain, those skilled in the art can make the scope that some nonessential improvement and adjustment belong to the utility model protection according to the content of above-mentioned the utility model.
In conjunction with Fig. 1 to Fig. 4.
Bucket number of sheets Z on the utility model runner shaft circumference is:
Figure BDA0000168663075
Wherein, k uBe the peripheral velocity coefficient,
Figure BDA0000168663076
Be the effluxvelocity coefficient,
Figure BDA0000168663077
Be runner name radius,
Figure BDA0000168663078
Be 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 the utility model bucket leaf plane structure schematic representation; Fig. 2 is the utility model bucket leaf side structure schematic representation.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 the utility model bucket leaf jet stream 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 the utility model parameter.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 the utility model bucket impeller structure, 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 the utility model patent 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 the runner bucket leaf of the utility model then is L so ＇=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 the utility model runner bucket leaf then is B so ＇=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 the utility model runner bucket leaf then is T so ＇=0.9d 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 utility model 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 the utility model bucket impeller structure 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:
Figure FDA0000168663061
Wherein, k uBe the peripheral velocity coefficient,
Figure FDA0000168663062
Be the effluxvelocity coefficient,
Figure FDA0000168663063
Be runner name radius,
Figure FDA0000168663064
Be 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.
CN2012202413683U 2012-05-25 2012-05-25 Runner structure of tangential turbine Expired - Fee Related CN202579008U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102734041A (en) * 2012-05-25 2012-10-17 西华大学 Tangential turbine runner
CN109359352A (en) * 2018-09-27 2019-02-19 西华大学 Energy-saving centrifugal pump volute design method based on speed coefficient method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102734041A (en) * 2012-05-25 2012-10-17 西华大学 Tangential turbine runner
CN109359352A (en) * 2018-09-27 2019-02-19 西华大学 Energy-saving centrifugal pump volute design method based on speed coefficient method
CN109359352B (en) * 2018-09-27 2023-02-10 西华大学 Energy-saving centrifugal pump volute design method based on speed coefficient method

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Granted publication date: 20121205

Termination date: 20210525