CN110242476B - Ultra-low specific speed diagonal flow type water turbine runner - Google Patents

Ultra-low specific speed diagonal flow type water turbine runner Download PDF

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Publication number
CN110242476B
CN110242476B CN201910591936.9A CN201910591936A CN110242476B CN 110242476 B CN110242476 B CN 110242476B CN 201910591936 A CN201910591936 A CN 201910591936A CN 110242476 B CN110242476 B CN 110242476B
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Prior art keywords
runner
blade
ultra
diameter
hub
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CN201910591936.9A
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CN110242476A (en
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李延频
张自超
陈德新
吴迎新
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North China University of Water Resources and Electric Power
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North China University of Water Resources and Electric Power
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
    • F03B3/12—Blades; Blade-carrying rotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
    • F03B3/12—Blades; Blade-carrying rotors
    • F03B3/121—Blades, their form or construction
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Abstract

The invention relates to a runner of an ultra-low specific speed diagonal flow type water turbine, which can effectively solve the problem that the large plane size of the diagonal flow type water turbine influences the ventilation effect of an air ductThe structure is that runner blades are uniformly distributed on a hub in a cantilever open mode without a lower ring and are arranged at the central part of a runner chamber through a main shaft, the angle between the axis of the blades and the axis of the main shaft is 30-60 degrees, and the relative diameter of the hub is dh/D10.5-0.9, relative width of blade B/D10.1-0.3, the wrap angle of the blade, namely the central angle theta occupied by the whole runner blade is 15-25 degrees, and the relative diameter Ds/D of the runner throat part of the runner chamber10.92 to 0.975; wherein d ishIs the diameter of the hub, D1Is the nominal diameter of the runner, B is the blade width, and Ds is the diameter of the throat of the runner. The invention has the advantages of simple structure, novelty, uniqueness, easy processing and production, convenient installation and use, high efficiency, energy conservation, environmental protection and good economic and social benefits.

Description

Ultra-low specific speed diagonal flow type water turbine runner
Technical Field
The invention relates to a water turbine, in particular to an ultra-low specific speed diagonal flow type water turbine runner.
Background
At present, an ultra-low specific speed mixed-flow water turbine is usually adopted by an industrial cooling tower complementary energy recovery water turbine, but the ventilation effect of an air duct is influenced due to the large plane size of the ultra-low specific speed mixed-flow water turbine. In addition, the mixed-flow water turbine with ultra-low specific speed has a flat structure and is difficult to weld. The axial flow water turbine with ultra-low specific speed is limited by the structural characteristics, and the single-stage available water head is not high. Therefore, the improvement and innovation of the ultra-low specific speed turbine runner are imperative.
Disclosure of Invention
In view of the above situation, in order to overcome the defects of the prior art, the present invention provides an ultra-low specific speed diagonal flow turbine runner, which can effectively solve the problems that the large plane size of the mixed flow turbine affects the ventilation effect of the wind tunnel, the runner channel is too flat and narrow to be manufactured, and the single-stage water head utilization of the ultra-low specific speed axial flow turbine is not high.
The technical scheme of the invention is that the ultra-low specific speed diagonal flow type water turbine runner comprises a hub and runner blades, wherein the runner blades are uniformly distributed on the hub in a suspension wall opening manner without a lower ring,is arranged at the central part of the runner chamber through a main shaft, the angle between the axis of the blade and the axis of the main shaft is 30-60 degrees, and the relative diameter of the hub is dh/D10.5-0.9, relative width of blade B/D10.1-0.3, the wrap angle of the blade, namely the central angle theta occupied by the whole runner blade is 15-25 degrees, and the relative diameter Ds/D of the runner throat part of the runner chamber10.92 to 0.975; wherein d ishIs the diameter of the hub, D1Is the nominal diameter of the runner, B is the blade width, and Ds is the diameter of the throat of the runner.
The invention has the advantages of simple structure, novelty, uniqueness, easy processing and production, convenient installation and use, high efficiency, energy conservation, environmental protection and good economic and social benefits.
Drawings
FIG. 1 is an axial view of the present invention (in the figure, the angle between the blade axis and the main shaft axis, D)1Is the nominal diameter of the runner, B is the blade width, Ds is the runner throat diameter).
FIG. 2 is a schematic diagram of a rotor blade profile of the present invention (β 1 is the blade inlet angle, β 2 is the blade outlet angle, and γ is the central angle between the inlet and outlet edges).
Fig. 3 is a perspective view showing the turbine runner according to the present invention.
FIG. 4 is a horizontal projection of the airfoil shape of a runner blade of the present invention (in the figure, θ is the blade wrap angle, A is the blade inlet edge, and C is the blade outlet edge).
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
As shown in figures 1-4, the invention relates to an ultra-low specific speed diagonal flow type water turbine runner, which comprises a hub and runner blades, wherein the runner blades 2 are uniformly distributed on the hub 1 in a cantilever opening manner without a lower ring, the runner blades are arranged at the central part of a runner chamber 3 through a main shaft, the angle between the axis of each blade and the axis of the main shaft is 30-60 degrees, and the relative diameter of the hub is dh/D10.5-0.9, relative width of blade B/D10.1-0.3, the wrap angle of the blade, namely the central angle theta occupied by the whole runner blade is 15-25 degrees, and the relative diameter Ds/D of the runner throat part of the 3 runner chamber10.92 to 0.975; wherein d ishIs the diameter of the hub, D1Is the nominal diameter of the runner, B is the blade width, and Ds is the diameter of the throat of the runner.
In order to ensure the use effect and the use convenience, the number of the runner blades 2 is 14-24, and the runner blades are uniformly distributed on the hub;
the density l/t of the flow surface in the middle of the blade cascade of the runner blade 2 is 1.4-1.8, wherein l is the chord length, and t is the grid distance.
The structure shows that the runner blade of the water turbine is in a cantilever open type, has no lower ring and is convenient to weld; meanwhile, under the condition of the same over flow, the required plane size of the diagonal flow type water turbine with the ultra-low specific speed is smaller than that of the mixed flow type water turbine.
The flow in the ultra-low specific speed diagonal flow runner can utilize centrifugal force generated by rotation and can utilize higher water head than that of the ultra-low specific speed axial flow runner.
Therefore, compared with the ultra-low specific speed mixed-flow water turbine and the ultra-low specific speed axial-flow water turbine, the ultra-low specific speed mixed-flow water turbine runner has obvious advantages, and effectively overcomes the defects that the ventilation effect of an air duct is influenced by the large plane size of the existing mixed-flow water turbine and the runner is too flat and narrow to manufacture; meanwhile, the method can be used for solving the problem that the single-stage water head of the axial flow water turbine with ultra-low specific speed is not high. In addition, the ultra-low specific speed diagonal flow type water turbine runner can also be used for a hydraulic power generation water turbine, the application range of the traditional diagonal flow type water turbine can be expanded to a medium and high water head area, and the runner has the following prominent beneficial technical effects compared with the prior art through repeated tests:
1. the required plane size of the ultra-low specific speed diagonal flow type water turbine is smaller than that of the ultra-low specific speed diagonal flow type water turbine under the same over-flow condition. Therefore, the ultra-low specific speed mixed-flow water turbine can solve the problem that the ventilation effect is influenced by the large plane size of the ultra-low specific speed mixed-flow water turbine for recovering the residual energy.
2. The ultra-low specific speed mixed-flow type water turbine runner is designed to have an open structure, does not have a lower ring and is easy to machine and manufacture, so that the problem that the ultra-low specific speed mixed-flow type water turbine is difficult to machine and manufacture due to the flat structure is solved.
3. The centrifugal force generated by the rotation of the fluid can be utilized in the ultra-low specific speed diagonal flow type water turbine runner, so that the utilization head of the single-stage water turbine can be improved compared with the ultra-low specific speed axial flow type runner.
4. The ultra-low specific speed diagonal flow type water turbine runner can also be used for a hydraulic power generation water turbine, so that the application range of the traditional diagonal flow type water turbine can be expanded to a medium-high water head area.
5. The ultralow-specific-speed diagonal flow type water turbine runner can overcome the defects of the existing ultralow-specific-speed diagonal flow type water turbine and the existing axial flow type water turbine, improves the energy utilization efficiency, avoids secondary waste of energy, and has good energy-saving and environment-friendly benefits and economic benefits.

Claims (3)

1. The ultra-low specific speed diagonal flow type water turbine runner comprises a hub and runner blades, and is characterized in that the runner blades (2) are uniformly distributed on the hub (1) in a suspended wall open manner without a lower ring, the runner blades are arranged at the central part of a runner chamber (3) through a main shaft, the angle between the axis of each blade and the axis of the main shaft is 30-60 degrees, and the relative diameter of the hub is dh/D10.5-0.9, relative width of blade B/D10.1-0.3, the wrap angle of the blade, namely the central angle theta occupied by the whole runner blade is 15-25 degrees, and the relative diameter Ds/D of the runner throat part of the runner chamber (3)10.92 to 0.975, wherein dhIs the diameter of the hub, D1Is the nominal diameter of the runner, B is the blade width, and Ds is the diameter of the throat of the runner.
2. The ultra-low specific speed diagonal flow turbine runner according to claim 1, wherein the number of the runner blades (2) is 14-24, and the runner blades are uniformly distributed on the hub.
3. The ultra-low specific speed diagonal flow turbine runner according to claim 1, wherein the blade grid intermediate flow surface consistency density l/t of the runner blade (2) is 1.4-1.8, wherein l is the chord length, and t is the grid pitch.
CN201910591936.9A 2019-07-03 2019-07-03 Ultra-low specific speed diagonal flow type water turbine runner Active CN110242476B (en)

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CN110242476B true CN110242476B (en) 2020-07-31

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CN114963483B (en) * 2021-02-20 2023-07-07 浙江盾安人工环境股份有限公司 Liquid separator

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2611623Y (en) * 2002-05-20 2004-04-14 四川工业学院 Shaft extension oblique flowing water-turbine
JP2009203911A (en) * 2008-02-28 2009-09-10 Kubota Corp Pump or water turbine
CN201588723U (en) * 2009-12-01 2010-09-22 西华大学 Lamp-bulb angled-discharge water turbine
CN201714558U (en) * 2010-05-24 2011-01-19 李延频 Double-rotating-wheel ultra-low specific rotate speed axial flow hydraulic turbine used for cooling tower fan driving
CN103743257A (en) * 2014-01-09 2014-04-23 西华大学 Efficient hydrodynamic cooling tower
CN105240184A (en) * 2015-10-27 2016-01-13 武汉大学 Ultra-low water head axial flow turbine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2611623Y (en) * 2002-05-20 2004-04-14 四川工业学院 Shaft extension oblique flowing water-turbine
JP2009203911A (en) * 2008-02-28 2009-09-10 Kubota Corp Pump or water turbine
CN201588723U (en) * 2009-12-01 2010-09-22 西华大学 Lamp-bulb angled-discharge water turbine
CN201714558U (en) * 2010-05-24 2011-01-19 李延频 Double-rotating-wheel ultra-low specific rotate speed axial flow hydraulic turbine used for cooling tower fan driving
CN103743257A (en) * 2014-01-09 2014-04-23 西华大学 Efficient hydrodynamic cooling tower
CN105240184A (en) * 2015-10-27 2016-01-13 武汉大学 Ultra-low water head axial flow turbine

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