CN110173385A - A kind of band guide vane ultrahigh water head section francis turbine runner design method - Google Patents

A kind of band guide vane ultrahigh water head section francis turbine runner design method Download PDF

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Publication number
CN110173385A
CN110173385A CN201910446300.5A CN201910446300A CN110173385A CN 110173385 A CN110173385 A CN 110173385A CN 201910446300 A CN201910446300 A CN 201910446300A CN 110173385 A CN110173385 A CN 110173385A
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CN
China
Prior art keywords
guide vane
runner
head section
water head
design method
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910446300.5A
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Chinese (zh)
Inventor
马建峰
刘思靓
张续钟
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Zhejiang Fuchunjiang Hydroelectric Equipment Co Ltd
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Zhejiang Fuchunjiang Hydroelectric Equipment Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhejiang Fuchunjiang Hydroelectric Equipment Co Ltd filed Critical Zhejiang Fuchunjiang Hydroelectric Equipment Co Ltd
Priority to CN201910446300.5A priority Critical patent/CN110173385A/en
Publication of CN110173385A publication Critical patent/CN110173385A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • F03B3/02—Machines or engines of reaction type; Parts or details peculiar thereto with radial flow at high-pressure side and axial flow at low-pressure side of rotors, e.g. Francis turbines
    • 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
    • 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
    • F03B3/125—Rotors for radial flow at high-pressure side and axial flow at low-pressure side, e.g. for Francis-type turbines
    • 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
    • F03B3/16—Stators
    • F03B3/18—Stator blades; Guide conduits or vanes, e.g. adjustable
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Hydraulic Turbines (AREA)

Abstract

The invention discloses a kind of band guide vane ultrahigh water head section francis turbine runner design methods, the following steps are included: guide vane and runner bucket are arranged on a. runner, guide vane and runner bucket alternate arrangement, and the length of guide vane is less than runner bucket；B. the angle between the inlet edge of runner blade of guide vane two sides with respect to roller centre is pitch angle θ 1, angle where the water inlet side of guide vane and the guide vane pressure surface between the inlet edge of runner blade of side with respect to roller centre is pitch angle θ 2, as head height 455-790m, 2/ 1=0.42-0.60 of θ of θ, and the ratio of θ 1 and θ 2 are reduced with the increase for being applicable in head height；C. guide vane outlet edge and two sides runner bucket distance A and distance B ratio are A/B=1.The present invention is intended to provide a kind of suitable for ultrahigh water head section, the band guide vane ultrahigh water head section francis turbine runner design method of raising Hydraulic Power System prototype runner generating efficiency.

Description

A kind of band guide vane ultrahigh water head section francis turbine runner design method
Technical field
The invention belongs to hydraulic turbine field more particularly to a kind of band guide vane ultrahigh water head section francis turbine runners Design method.
Background technique
Hydraulic turbine structure form is different according to its energy conversion formula, and applicable head range is also different.Different water wheels Machine structure type will significantly affect power station civil engineering scale, unit manufacturing cost and operational reliability.250m the above are high water head, 400m is the above are ultrahigh-water head, and 600m-700m has had arrived at the theoretical limit of Francis turbine, and exploitation design difficulty is very Greatly.551.7 meters, output of hydraulic turbine 82MW of its highest head of mixed-flow power station of country's highest head at present, high water head unit Hydraulic turbine energy indexes (generating efficiency) usually only 92% or so, have a long way to go with international most advanced level.Since high water head is mixed Stream machine technical difficulty is big, and in 600m or more ultrahigh-water head machine set technology there are technological gap, the country there is no independent open for China Hair realizes the Francis hydroturbine generator set of the 600m or more of application.
Summary of the invention
The present invention is provided a kind of suitable for ultrahigh-water head, raising water to overcome above-mentioned deficiency in the prior art The band guide vane ultrahigh water head section francis turbine runner design method of Force system prototype runner generating efficiency.
To achieve the goals above, the invention adopts the following technical scheme:
A kind of band guide vane ultrahigh water head section francis turbine runner design method, comprising the following steps:
A. guide vane is set on runner and runner bucket, guide vane and runner bucket alternates arrangement, guide vane Length is less than runner bucket；
B. the angle between the inlet edge of runner blade of guide vane two sides with respect to roller centre is pitch angle θ 1, guide vane into Angle where waterside and the guide vane pressure surface between the inlet edge of runner blade of side with respect to roller centre is pitch angle θ 2, As head height 455-790m, 2/ 1=0.42-0.60 of θ of θ, and the ratio of θ 1 and θ 2 are reduced with the increase for being applicable in head height；
C. guide vane outlet edge and two sides runner bucket distance A and distance B ratio are A/B=1.
Preferably, in step b, as applicable 2/ 1=0.56-0.60 of θ of head 455-590m, θ；As applicable head 590- 2/ 1=0.48-0.56 of θ of 710m, θ；As applicable 2/ 1=0.42-0.48 of θ of head 710-790m, θ.
Preferably, the arc length ratio of runner bucket and guide vane is 2 to 3 in step a.
Preferably, the ratio between runner bucket aerofoil profile minimum thickness and maximum gauge are 0.0045 to 0.0065 in step b.
Preferably, guide vane aerofoil profile minimum thickness and maximum gauge ratio are 0.0035 to 0.0055 in step b.
The beneficial effects of the present invention are: (1) realizes 600m-755m ultrahigh water head section, single-machine capacity is greater than 120MW；(2) lead to The variation for crossing pitch angle reduces hydraulic vibration of the runner under ultrahigh-water head in the separation of flow and runner, improves hydraulic stability；(3) it mentions High generating efficiency, guarantees that Hydraulic Power System prototype runner generating efficiency reaches 94.5% or more.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the invention；
Fig. 2 is that the present invention removes the structural schematic diagram after crown；
Fig. 3 is the structural schematic diagram of introduction blade of the present invention, runner bucket and lower ring junction;
Fig. 4 is the structural schematic diagram of runner bucket and guide vane of the present invention；
Fig. 5 is prototype test result of the invention.
In figure: crown 1, lower ring 2, guide vane 3, guide vane pressure surface 3a, runner bucket 4.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and detailed description.
In embodiment as shown in Figure 1, a kind of band guide vane ultrahigh water head section francis turbine runner design method, The following steps are included:
A. guide vane is set on runner and runner bucket, guide vane and runner bucket alternates arrangement, guide vane Length is less than runner bucket；As shown in Figure 1, runner includes crown 1 and lower ring 2, runner bucket 4 is set between crown 1 and lower ring 2 With guide vane 3, runner bucket 4 and guide vane 3 are evenly distributed along the axis of rotation of runner, and runner bucket 4 and lead Stream blade 3 is alternately arranged.In conjunction with shown in Fig. 2, Fig. 3, runner bucket 4 is longer, and guide vane 3 is shorter.The outer end of runner bucket 4 Side and the outer end side of guide vane 3 are water inlet side, and the arc length ratio of runner bucket 4 and guide vane 3 is 2 to 3, as into one Step optimizes, and the arc length ratio of runner bucket 4 and guide vane 3 is all made of 2.44 in the present embodiment, and water flow flows through runner from outside to inside When between blade 4, guide vane 3 plays good guide functions.
B. the angle between the inlet edge of runner blade of guide vane two sides with respect to roller centre is pitch angle θ 1, guide vane Water inlet side and guide vane pressure surface 3a where side inlet edge of runner blade between with respect to the angle of roller centre be section Elongation θ 2, as head height 455-790m, 2/ 1=0.42-0.60 of θ of θ, and the ratio of θ 1 and θ 2 are with the increase for being applicable in head height And it reduces；As applicable 2/ 1=0.56-0.60 of θ of head 480-590m, θ；As applicable 2/ 1=0.48-0.56 of θ of head 590-710m, θ； As applicable 2/ 1=0.42-0.48 of θ of head 710-790m, θ.As shown in figure 4, runner bucket aerofoil profile minimum thickness h1 and maximum gauge The ratio between h2 is 0.0045 to 0.0065, h2=0.00526 h1/ in the present embodiment；Guide vane aerofoil profile minimum thickness h11 and maximum 22 ratio of thickness h is 0.0035 to 0.0055, h11/h22=0.00468 in the present embodiment.
C. guide vane outlet edge and two sides runner bucket distance A and distance B ratio are A/B=1.
Fig. 5 is certain authoritative hydraulic turbine model laboratory model machine test result, operating head polishing height Hp 600m, 625.2m, 640.5m and highest 689.6m, in each head height there are also different load Pmp, respectively 60MW, 80MW, 100MW are additionally provided with 126MW for 640.5m and 689.6m head height.For 600m head, θ in the present embodiment 2/ θ 1 takes 0.523, for 600m-689.6m head.As can be seen from the table, no matter how high head height is, power station device cavitation Factor sigmaplRespectively less than it is equal to 0.03, and is reduced as head height increases；Critical cavitation coefficient σsIt can be with the increasing of load Add and increase accordingly, but when head height increases, σsIt can be reduced with the incrementss of load, especially in highest head When 689.6m, even if load reaches 126MW, σsIt is only promoted to 0.015, illustrates such design for the adaptation energy of ultrahigh-water head Power is stronger.σcrDecline 0.2% critical cavitation coefficient for efficiency, be consistently less than equal to 0.01, in, σ when low-loadcrMuch Lower than 0.01；Initial cavitation coefficient σiIt is respectively less than 0.01 in most cases, and each negative in highest head 689.6m All it is far smaller than 0.01 in the case of load.It can be seen that detecting by authoritative institution, runner test excellent performance, highest runs water Head 689.6m, Hydraulic Power System prototype runner generating efficiency reach 94.6% or more, significantly larger than current domestic high water head unit The generating efficiency of the hydraulic turbine 92% or so, pressure fluctuation effectively reduce the hydraulic vibration in the separation of flow and runner less than percent 0.5, Operational process is reliable and stable.

Claims (5)

1. a kind of band guide vane ultrahigh water head section francis turbine runner design method, comprising the following steps:
A. guide vane is set on runner and runner bucket, guide vane and runner bucket alternates arrangement, guide vane Length is less than runner bucket；
B. the angle between the inlet edge of runner blade of guide vane two sides with respect to roller centre is pitch angle θ 1, guide vane into Angle where waterside and the guide vane pressure surface between the inlet edge of runner blade of side with respect to roller centre is pitch angle θ 2, As head height 455-790m, 2/ 1=0.42-0.60 of θ of θ, and the ratio of θ 1 and θ 2 are reduced with the increase for being applicable in head height；
C. guide vane outlet edge and two sides runner bucket distance A and distance B ratio are A/B=1.
2. a kind of band guide vane ultrahigh water head section francis turbine runner design method according to claim 1, It is characterized in, in step b, as applicable 2/ 1=0.56-0.60 of θ of head 455-590m, θ；When 2/ θ 1 of applicable head 590-710m, θ= 0.48-0.56；As applicable 2/ 1=0.42-0.48 of θ of head 710-790m, θ.
3. a kind of band guide vane ultrahigh water head section francis turbine runner design method according to claim 1, It is characterized in, in step a, the arc length ratio of runner bucket and guide vane is 2 to 3.
4. a kind of band guide vane ultrahigh water head section francis turbine runner design method according to claim 1, It is characterized in, in step b, the ratio between runner bucket aerofoil profile minimum thickness and maximum gauge are 0.0045 to 0.0065.
5. a kind of band guide vane ultrahigh water head section francis turbine runner design method according to claim 1, It is characterized in, in step b, guide vane aerofoil profile minimum thickness and maximum gauge ratio are 0.0035 to 0.0055.
CN201910446300.5A 2019-05-27 2019-05-27 A kind of band guide vane ultrahigh water head section francis turbine runner design method Pending CN110173385A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2407613A1 (en) * 1973-03-01 1974-09-05 Philips Nv Paddle wheel for a vacuum compressor
WO2005116454A1 (en) * 2004-05-28 2005-12-08 Hmy, Ltd. Impeller for supercharger and method of manufacturing the same
CN102364083A (en) * 2011-07-01 2012-02-29 哈尔滨电机厂有限责任公司 Long-short blade rotating wheel for mixed flow pump turbine
CN103775389A (en) * 2014-01-09 2014-05-07 浙江工业大学 Radial guide blade for sectional multistage pump
CN105805043A (en) * 2016-04-07 2016-07-27 西安理工大学 Design method for nonadjustable axial flow pump impeller with characteristic of long blades and short blades

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2407613A1 (en) * 1973-03-01 1974-09-05 Philips Nv Paddle wheel for a vacuum compressor
WO2005116454A1 (en) * 2004-05-28 2005-12-08 Hmy, Ltd. Impeller for supercharger and method of manufacturing the same
CN102364083A (en) * 2011-07-01 2012-02-29 哈尔滨电机厂有限责任公司 Long-short blade rotating wheel for mixed flow pump turbine
CN103775389A (en) * 2014-01-09 2014-05-07 浙江工业大学 Radial guide blade for sectional multistage pump
CN105805043A (en) * 2016-04-07 2016-07-27 西安理工大学 Design method for nonadjustable axial flow pump impeller with characteristic of long blades and short blades

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Application publication date: 20190827

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