CN101344059B - Reverse S type runner of mixed-flow turbine - Google Patents
Reverse S type runner of mixed-flow turbine Download PDFInfo
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- CN101344059B CN101344059B CN2008101370208A CN200810137020A CN101344059B CN 101344059 B CN101344059 B CN 101344059B CN 2008101370208 A CN2008101370208 A CN 2008101370208A CN 200810137020 A CN200810137020 A CN 200810137020A CN 101344059 B CN101344059 B CN 101344059B
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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
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 possibly 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 is as shown in Figure 2, and its water inlet limit 4 is straight line or parabola, has only a flex point at most.Negative incidence blade plan view is as shown in Figure 3, and its water inlet limit 4 is straight line or parabola, has only a flex point at most.
Summary of the 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 through changing; Secondly be the shape of following ring-like line (blade with encircle intersection down) of shape and special blade of the crown molded lines (blade and crown intersection) of blade radial length, special blade, 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 upper reaches deflector and over against the waterside that goes out in downstream: the water inlet limit of blade has two flex points from the A point to the D point; There are P1, two flex points of P2 in the water inlet limit of blade, and the water inlet limit 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 S1, two flex points of 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 X1, two flex points of X2 from the A point, and following ring-like line presents oppositely " S " type.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 blade water inlet limit (4) and the intersection point of crown (1), and line AD is the water inlet limit (4) of blade, line BC be blade go out waterside (5).
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 is instead " S " type, incoming flow when its middle and lower part adapts to small flow, incoming flow when its middle and upper part adapts to big flow, thereby the fluidised form of blade import when improving small flow with flow greatly simultaneously.Could keep water inlet end portion little like this, help improving the runner optimum hydraulic efficiency.
Water inlet limit A, the D of blade and the ratio that goes out waterside B, C arc length and nominal diameter φ increase; Be equivalent to add linear leaf; Increase the acting area; Improve energy transformation ratio, realize having broad more high-efficiency operation scope, realize 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 property 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 of following ring-like line (blade with time encircle intersection) of crown molded lines (blade and crown intersection) and blade with blade water inlet limit, blade of Reasonable Shape; 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 upper reaches deflector and go out waterside 5 over against downstream.ABCD is that the axial plane figure of blade is the figure of the plane formation of blade rotating and projection to a process water turbine center of rotation Z among Fig. 4, and φ is the diameter (being called nominal diameter again) that A is ordered, and P representes influent side, 0 expression water outlet side, and Z representes 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 blade water inlet limit 4 and the intersection point of crown 1, and line AD is the water inlet limit 4 of blade, line BC be blade go out waterside 5.
The water inlet limit 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, from 4 operations along the water inlet limit of A point, earlier through a flex point on straight line AD right side, pass through a flex point in straight line AD left side then, arrive the D point at last.There are P1, two flex points of P2 in the water inlet limit 4 that in Fig. 6, shows blade 2, 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 in Fig. 6, shows blade 2 has S1, two flex points of 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 in Fig. 6, shows blade 2 has X1, two flex points of X2, and slightly is anti-" S " type.
The quantitative range of blade of the present invention: 15～17.
Claims (2)
1. reverse S type runner of mixed-flow turbine; Comprise a crown (1), one down ring (3) be connected crown (1) and time encircle the curved surface bucket (2) between (3) with several; Each blade all has one in water turbine, the water inlet limit (4) of upper reaches deflector and go out waterside (5) over against downstream; It is characterized in that: the water inlet limit (4) of blade (2) has two flex points from the A point to the D point; There are P1, two flex points of P2 in the water inlet limit (4) of blade (2), and the water inlet limit (4) of 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 S1, two flex points of 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; To the B point two flex points are arranged from the A point, the following ring-like line (7) of blade (2) has X1, two flex points of X2, and following ring-like line (7) presents oppositely " S " type; 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 a blade outlet (5) and the intersection point of ring (3) down, and some C is a blade outlet (5) and the intersection point of crown (1), and some D is blade water inlet limit (4) and the intersection point of crown (1); Line AD is the water inlet limit (4) of blade, line BC be blade go out waterside (5).
2. a kind of reverse S type runner of mixed-flow turbine according to claim 1 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101344059A CN101344059A (en) | 2009-01-14 |
| CN101344059B true 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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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102011672B (en) * | 2010-12-08 | 2012-07-25 | 清华大学 | Mixed flow turbine employing novel guide blade and runner blade profile |
| NO333777B1 (en) | 2012-01-03 | 2013-09-16 | Rainpower Technology As | Impeller for francist turbine |
| 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 |
| CN110410259B (en) * | 2019-08-07 | 2021-06-22 | 东方电气集团东方电机有限公司 | Blade head overhanging type rotating wheel |
| CN110439724B (en) * | 2019-08-07 | 2021-01-01 | 东方电气集团东方电机有限公司 | Mixed-flow runner for hydraulic machinery |
| 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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| CN101344059A (en) | 2009-01-14 |
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