CN101344059A - Reverse S type runner of mixed-flow turbine - Google Patents
Reverse S type runner of mixed-flow turbine Download PDFInfo
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- CN101344059A CN101344059A CNA2008101370208A CN200810137020A CN101344059A CN 101344059 A CN101344059 A CN 101344059A CN A2008101370208 A CNA2008101370208 A CN A2008101370208A CN 200810137020 A CN200810137020 A CN 200810137020A CN 101344059 A CN101344059 A CN 101344059A
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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
- 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 invention relates to an inversed-S type rotating wheel of a mixed-flow water turbine, comprising an upper crown, a lower ring and a plurality of cambered blade which are connected between the upper crown and the lower ring; the water-inlet edges of the blades take inversed-S type, thus improving the flow state of inlets of the blades when in small flow and large flow, simultaneously keeping the head of the water-inlet edge to be small and obtaining higher optimalizing efficiency; the blade is lengthened so as to realize more broad operating range with high efficiency, namely realize that the power station has performance index with high efficiency in the operating conditions with small flow, large flow and optimalizing condition; the shape of the upper crown-typed line of the blade and the shape of the lower ring-typed line of the particular blade take inversed-S type slightly, thus reducing the outlet flow speed, and improving the internal flow state of the rotating wheel and enhancing the operation stability of the machine group.
Description
Technical field:
Reverse S type runner of mixed-flow turbine belongs to water turbine and makes art.
Technical background: through long-term technical development, Francis turbine finalizes the design almost, but the slight improvements of the sheet aerofoil profile of runner may produce considerable influence to turbine efficiency and stability.In recent years, domestic large and medium-sized hydraulic generator unit requirement of invitation for bid francis turbine runner had proposed special requirement to energy indexes under the prerequisite that guarantees stability.Requirement all has high efficiency performance index in the operating conditions of small flow, big flow and optimum operating condition, promptly still keep high efficiency with changes in flow rate, realizes increasing unit output, makes the power station obtain bigger economic benefit.
Early stage achievement in research shows that bigger stator distribution circle hydrous water turbine blade water inlet end portion can improve the efficient of small flow and big flow operating conditions more greatly, but optimum efficiency is lower.Modern achievement in research shows that stator distribution circle and leaf head are less, can improve the efficient of hydraulic turbine model optimum operating condition and big flow operating conditions, but the efficient of small flow operating conditions is low.All having high efficiency performance index in the operating conditions of the small flow that the power station requires, big flow and optimum operating condition is contradiction on present understanding to water turbine.Existing francis turbine runner blade is generally common blade and negative incidence blade.The common blade plan view as shown in Figure 2, its water inlet limit 4 be straight line or parabola, have only a flex point at most.Negative incidence blade plan view as shown in Figure 3, its water inlet limit 4 be straight line or parabola, have only a flex point at most.
The content of invention: the objective of the invention is to disclose a kind of reverse S type runner of mixed-flow turbine.The main position that the present invention relates to is an inlet edge of runner blade, improves stability when water inlet limit shape realizes having broad more high-efficiency operation scope by changing; Secondly be the shape of the shape of crown molded lines (blade and crown intersection) of blade radial length, special blade and the following ring-like line of special blade (blade with encircle intersection down), the efficient and the stability of raising runner.Technological scheme of the present invention is: a kind of reverse S type runner of mixed-flow turbine, ring and several are connected crown and the curved surface bucket between the ring down down to comprise a crown, one, each blade all has one in water turbine, the water inlet limit of upstream deflector and over against the waterside that goes out in downstream: the water inlet limit molded lines of blade has two flex points from the A point to the D point, the water inlet limit molded lines of blade has two flex points of P1, P2, and the water inlet limit molded lines of blade is reverse " S " type; The crown molded lines of blade is blade and crown intersection, to the C point two flex points is arranged from the D point, and the crown molded lines of blade has two flex points of S1, S2, and the crown molded lines presents oppositely " S " type; The following ring-like line of blade is blade and following ring intersection, and to two flex points are arranged the B point, the following ring-like line of blade has two flex points of X1, X2 from the A point, and following ring-like line presents oppositely " S " type; The axial plane of blade water inlet limit A, D and axial plane go out the ratio of waterside B, C streamline arc length and nominal diameter φ, promptly arc length AB/ φ more than or equal to 41%, arc length CD/ φ is more than or equal to 48%, and arc length CD is greater than arc length AB.
According to the present invention, water inlet limit anti-S type runner bucket reasonable in design can make Francis turbine benefit in the following areas.
1 turbine efficiency
Blade water inlet limit molded lines is instead " S " type, incoming flow when its middle and lower part adapts to small flow, and incoming flow when its middle and upper part adapts to big flow, thus improve small flow and the fluidised form of blade import during flow greatly simultaneously.Could keep water inlet end portion little like this, help improving the runner optimum hydraulic efficiency.
Axial plane water inlet limit A, D and the axial plane of blade goes out waterside B, C streamline arc length increases with the ratio of nominal diameter φ, be equivalent to add linear leaf, increase the acting area, improve energy transformation ratio, realization has broad more high-efficiency operation scope, realizes that promptly the power station all has high efficiency performance index in the operating conditions of small flow, big flow and optimum operating condition.Because lengthened vanes has reduced the blade surface flow velocity, therefore help to improve set steady simultaneously.
The shape of the crown molded lines of blade (blade and crown intersection), bigger to the influence of the turbine efficiency of big flow, increased near the pressure reduction of blade pressure surface and the suction surface crown, help the raising of runner efficiency.Simultaneously, reduce exit velocity, improve fluidised form in the runner.
The shape of the following ring-like line of blade (blade with down ring intersection), bigger to the turbine efficiency influence, increased near the pressure reduction of blade pressure surface and suction surface time ring, help the raising of runner efficiency.Simultaneously, reduce exit velocity, improve fluidised form in the runner.
Model test of hydraulic turbine shows: the anti-S type blade with the crown molded lines (blade and crown intersection) of blade water inlet limit molded lines, blade of Reasonable Shape and following ring-like line of blade (blade with time encircle intersection), can make the water turbine optimum efficiency improve 5～10 ‰, and small flow and big flow turbine efficiency are increased substantially.
2 water turbine stability
Practice shows: outlet of rotary wheel circular rector and Pressure Fluctuation in Draft Tube, direct relation is arranged, and be the important indicator of weighing water turbine stability.The alteration of form of the following ring-like line of the shape of the crown molded lines of blade (blade and crown intersection) and special blade (blade and following ring intersection), use the waterside shape changes thereupon, thereby the circular rector that is controlled at outlet of rotary wheel when departing from optimum operating condition distributes, fundamentally avoid energy accumulating, realize reducing the pressure pulsation in the draft tube, improve the stability of unit operation.
Description of drawings:
The anti-S type of Fig. 1 Francis turbine runner erection drawing
The conventional runner bucket plan view of Fig. 2 Francis turbine
Fig. 3 Francis turbine negative incidence runner bucket plan view
The anti-S type of Fig. 4 Francis turbine runner bucket axial plane schematic representation
The anti-S type of Fig. 5 Francis turbine runner bucket plan view
The anti-S type of Fig. 6 Francis turbine runner bucket stereogram
Embodiment:
As shown in Figure 1, the present invention includes a crown 1, one down ring 3 and several be connected crown 1 and the three-dimensional twisted blade 2 between the ring 3 down, each blade has one in water turbine, the water inlet limit 4 of upstream deflector and go out waterside 5 over against the downstream.ABCD is the axial plane of blade among Fig. 4, and φ is the diameter (being called nominal diameter again) that A is ordered, and P represents influent side, and O represents water outlet side, and Z represents the water turbine center of rotation.The definition of blade related point, line: some A is blade water inlet limit 4 and the intersection point that encircles 3 down, point B is blade outlet 5 and the intersection point that encircles 3 down, point C is the intersection point of blade outlet 5 and crown 1, point D is the intersection point of blade water inlet limit 4 and crown 1, line AD is the water inlet limit 4 of blade, line BC be blade go out waterside 5.
The water inlet limit molded lines 4 of blade 2 has two flex points from the A point to the D point.Two flex points lay respectively at the both sides of straight line AD among Fig. 5, are starting point with the A point, along molded lines 4 operations of water inlet limit, earlier through a flex point on straight line AD right side, pass through a flex point in straight line AD left side then from the A point, arrive the D point at last.The water inlet limit molded lines 4 that shows blade 2 in Fig. 6 has two flex points of P1, P2, and is significantly anti-" S " type;
The crown molded lines 6 of blade 2 (blade and crown intersection) has two flex points from the D point to the C point.Two flex points lay respectively at the both sides of straight line DC among Fig. 5, are starting point with D, from the D point along vacuum side of blade and 6 operations of crown intersection, earlier through a flex point on straight line DC right side, pass through a flex point in straight line DC left side then, arrive the C point at last.The crown molded lines 6 that shows blade 2 in Fig. 6 has two flex points of S1, S2, and slightly is anti-" S " type;
The following ring-like line 7 of blade 2 (blade and following ring intersection) has two flex points from the A point to the B point.Two flex points lay respectively at the both sides of straight line AB among Fig. 5, are starting point with A, from the A point along front side of vane or the back side and ring intersection 7 operations down, earlier through a flex point on straight line AB right side, pass through a flex point in straight line AB left side then, arrive the B point at last.The following ring-like line 7 that shows blade 2 in Fig. 6 has two flex points of X1, X2, and slightly is anti-" S " type;
The axial plane of blade 2 water inlet limit 4A, D and axial plane go out the ratio of waterside 5B, C streamline arc length and nominal diameter φ, promptly arc length AB/ φ more than or equal to 41%, arc length CD/ φ is more than or equal to 48%, and arc length CD is greater than arc length AB.
The quantitative range of blade of the present invention: 15～17.
Claims (2)
1, a kind of reverse S type runner of mixed-flow turbine, ring (3) and several are connected crown (1) and time encircle curved surface bucket (2) between (3) down to comprise a crown (1), one, each blade all has one in water turbine, the water inlet limit (4) of upstream deflector and go out waterside (5) over against the downstream, it is characterized in that: the water inlet limit molded lines (4) of blade (2) has two flex points from the A point to the D point, the water inlet limit molded lines (4) of blade (2) has two flex points of P1, P2, and the water inlet limit molded lines (4) that shows blade (2) is reverse " S " type; The crown molded lines (6) of blade (2) is blade and crown intersection, to the C point two flex points is arranged from the D point, and the crown molded lines (6) of blade (2) has two flex points of S1, S2, and crown molded lines (6) presents oppositely " S " type; The following ring-like line (7) of blade (2) is blade and following ring intersection, and to two flex points are arranged the B point, the following ring-like line (7) of blade (2) has two flex points of X1, X2 from the A point, and following ring-like line (7) presents oppositely " S " type; The axial plane of blade (2) water inlet limit (4) A, D and axial plane go out the ratio of waterside (5) B, C streamline arc length and nominal diameter φ, promptly arc length AB/ φ more than or equal to 41%, arc length CD/ φ is more than or equal to 48%, and arc length CD is greater than arc length AB.
2, according to claim 11, a kind of reverse S type runner of mixed-flow turbine is characterized in that: the quantitative range of described blade: 15～17.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101370208A CN101344059B (en) | 2008-08-28 | 2008-08-28 | Reverse S type runner of mixed-flow turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101370208A CN101344059B (en) | 2008-08-28 | 2008-08-28 | Reverse S type runner of mixed-flow turbine |
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| Publication Number | Publication Date |
|---|---|
| CN101344059A true CN101344059A (en) | 2009-01-14 |
| CN101344059B CN101344059B (en) | 2012-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008101370208A Active CN101344059B (en) | 2008-08-28 | 2008-08-28 | Reverse S type runner of mixed-flow turbine |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102011672A (en) * | 2010-12-08 | 2011-04-13 | 清华大学 | Radial-axial flow turbine employing novel guide blade and runner blade profile |
| CN103114953A (en) * | 2012-12-07 | 2013-05-22 | 哈尔滨电机厂有限责任公司 | Mixed-flow type water turbine reversed S-shaped rotating wheel with long and short blades |
| EP2923075B1 (en) | 2012-01-03 | 2019-02-20 | Rainpower Technology AS | A francis turbine runner |
| CN110410259A (en) * | 2019-08-07 | 2019-11-05 | 东方电气集团东方电机有限公司 | A kind of leaf head cantilever type runner |
| CN110439724A (en) * | 2019-08-07 | 2019-11-12 | 东方电气集团东方电机有限公司 | A kind of francis turbine runner for hydraulic |
| CN113458736A (en) * | 2021-07-28 | 2021-10-01 | 东方电气集团东方电机有限公司 | Method for manufacturing rotating wheel of water turbine |
-
2008
- 2008-08-28 CN CN2008101370208A patent/CN101344059B/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102011672A (en) * | 2010-12-08 | 2011-04-13 | 清华大学 | Radial-axial flow turbine employing novel guide blade and runner blade profile |
| CN102011672B (en) * | 2010-12-08 | 2012-07-25 | 清华大学 | Mixed flow turbine employing novel guide blade and runner blade profile |
| EP2923075B1 (en) | 2012-01-03 | 2019-02-20 | Rainpower Technology AS | A francis turbine runner |
| CN103114953A (en) * | 2012-12-07 | 2013-05-22 | 哈尔滨电机厂有限责任公司 | Mixed-flow type water turbine reversed S-shaped rotating wheel with long and short blades |
| CN110410259A (en) * | 2019-08-07 | 2019-11-05 | 东方电气集团东方电机有限公司 | A kind of leaf head cantilever type runner |
| CN110439724A (en) * | 2019-08-07 | 2019-11-12 | 东方电气集团东方电机有限公司 | A kind of francis turbine runner for hydraulic |
| CN113458736A (en) * | 2021-07-28 | 2021-10-01 | 东方电气集团东方电机有限公司 | Method for manufacturing rotating wheel of water turbine |
| CN113458736B (en) * | 2021-07-28 | 2022-11-22 | 东方电气集团东方电机有限公司 | Method for manufacturing rotating wheel of water turbine |
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| Publication number | Publication date |
|---|---|
| CN101344059B (en) | 2012-07-04 |
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