CN108953217A - A kind of particular configuration blade improving surface cavitation flow behavior - Google Patents
A kind of particular configuration blade improving surface cavitation flow behavior Download PDFInfo
- Publication number
- CN108953217A CN108953217A CN201810787133.6A CN201810787133A CN108953217A CN 108953217 A CN108953217 A CN 108953217A CN 201810787133 A CN201810787133 A CN 201810787133A CN 108953217 A CN108953217 A CN 108953217A
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- China
- Prior art keywords
- particular configuration
- blade
- pit
- flow behavior
- cavitation
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
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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
- F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
- F03B11/04—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator for diminishing cavitation or vibration, e.g. balancing
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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
- F03B3/121—Blades, their form or construction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
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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
-
- 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
A kind of particular configuration blade for improving surface cavitation flow behavior of the present invention, belongs to the design and manufacturing technology field of hydraulic.The design directly by influencing retroeflection stream and pressure distribution using blade suction surface pit come suppression cavitation, forms and meets configuration that is that cavitation is controlled consumption and not influencing blade hydrodynamic performance.The present invention can reach delay cavitation and occur and inhibit retroeflection stream, achieve the effect that reducing cavitation influences hydraulic performance.
Description
Technical field
The invention belongs to hydraulic design and manufacturing technology field, it is related to a kind of improving surface cavitation flow behavior
Particular configuration blade.
Background technique
Cavitation refers to mutually converting between the liquid phase and gas phase occurred in working medium or on the surface of solids, and usually
With a kind of phenomenon of vibration and noise.Hydraulic is inevitably run under cavitation condition, and serious cavitation meeting
Cause pressure fluctuation, vibration, noise, erosion or even the serious destruction of hydraulic.In order to mitigate this phenomenon as far as possible to water
The harm of power equipment, the method that hydraulic blade design is typically based on active control and passively controls at present, delays cavitation
Occurrence and development, so that cavitation phenomenon is able to effectively improve and inhibit.
In the Active Control Method for inhibiting the occurrence and development of blade surface cavitation, due to need corresponding auxiliary equipment,
The additional consumption of cavitating flow automatic control technology and energy, there are certain difficulty in the application of actual hydraulic at present.
It needs to invent one kind now based on passive control methods, also can effectively improve and control the particular configuration blade of surface Cavitation flows,
To improve and optimize the operation of most hydraulic mechanical equipments.Currently, mainly being taken in the passive control methods of cavitation
Blade suction surface arranges the methods of barrier, and arrangement bubble generator to delay the development with suppression cavitation.And by setting
The blade of hydraulic particular configuration is counted to adjust cavitation occurrence and development, at home and abroad also rarely has people to study.Currently, right
Under the conditions of cavitation is existing, there has been no sufficient to recognize for the use of particular configuration blade is on hydraulic is run and performance influences
Know, relevant product and design method still belong to blank.
Summary of the invention
Present invention could apply to the exploitation of hydraulic and design fields to propose for cavitation bring negative effect
A kind of particular configuration blade and its design method improving surface cavitation flow behavior.The technical scheme is that by
Blade surface regularly processes pit/groove, the flow feature based on fluid in pit/groove, attached to solid boundaries
The backward jet closely generated is adjusted, and achievees the purpose that adjust cavitating flow so as to improve fluid field pressure distribution.
Technical solution of the present invention:
A kind of particular configuration blade improving surface cavitation flow behavior, including blade 1, pit or groove 2；
The pit or groove 2 is distributed on the suction surface of hydraulic blade, according to the numerical value of cavitating flow characteristic
And experiment analysis results, suction surface pit or groove 2 are arranged away between blade inlet edge 20%-85% chord length；Blade surface is recessed
The width or diameter of hole or groove 2 are the 2%-8% of chord length；The depth of blade surface pit or groove 2 is the 1%- of chord length
8%；The distribution mode of blade surface pit or groove 2 is single row or multiple rows, and form is the conduit of strip or arcuation, rule row
The circle or other forms of column.
A kind of design method for the particular configuration blade improving surface cavitation flow behavior, comprising the following steps:
Step 1, basis determine without pit/groove water engineer the specific requirements of hydraulic using traditional design method
Tool structure and blade profile；
Step 2 obtains blade and establishes threedimensional model to step 1 design, using Fluid Mechanics Computation method to threedimensional model
Sunykatuib analysis obtains particular state, the flow characteristics in boundary layer and retroeflection stream of cavitation occurrence and development.
The flow characteristics progress of step 3, the particular state that cavitation occurrence and development are obtained to step 2, boundary layer and retroeflection stream
Analysis, obtained cavitating flow characteristic；According to cavitating flow characteristic, in blade suction surface design surface pit, groove position is set
It sets away between blade inlet edge 20%-85% chord length；The width or diameter of blade surface pit are the 2%-8% of chord length；Blade
The depth of surface crater is the 1%-8% of chord length；The distribution mode of blade surface pit can be single row or multiple rows, and form can be with
It is the conduit of strip or arcuation, the circle of aligned transfer or other forms.
Beneficial achievement of the invention:
(1) inhibit retroeflection stream.Groove reduces the thickness of blade surface boundary layer, enhances degeneration-resistant pressure energy power, but touch
The acceleration of groove near zone retroeflection stream is sent out.It, just can be to sky only when anti-adverse pressure gradient ability is greater than back jet impulse
Change is inhibited.
(2) delay cavitation occurrence and development.When cloud cavitation occurs, surface configuration appropriate can make blade suction surface side
Interlayer is thinning, and boundary layer separation point lag, blade trailing edge recirculating zone is thinned, and suction surface low-pressure area reduces, it was demonstrated that surface configuration
The adaptability that cavitation is inhibited.
Detailed description of the invention
Fig. 1 is a kind of particular configuration blade construction schematic diagram for improving surface cavitation flow behavior.
In figure: 1 blade；2 pits.
Specific embodiment
Below in conjunction with attached drawing and technical solution, a specific embodiment of the invention is further illustrated.
As shown in Figure 1, the present invention includes a kind of particular configuration blade for improving surface cavitation flow behavior, mainly by blade
1, pit 2 forms；
(1) according to the requirement of design, original 1 structure of waterpower mechanical blade is NACA66 (MOD) aerofoil profile, the blade incoming flow angle of attack
It is 8 °, speed of incoming flow 7.832m/s, incoming-flow pressure 101.325kPa, temperature is 20 DEG C, and working medium is water, and cavitation number at this time is
0.91。
(2) for not arranging NACA66 (MOD) aerofoil profile of blade surface pit in design, by physics and mathematical modeling,
Carry out the numerical analysis of cavitating flow, the flowing of the particular state and boundary layer, retroeflection stream that obtain cavitation occurrence and development is special
Sign.Analog result discovery causes vacuole to be detached from by retroeflection stream, greatly influences the steady flow condition in flow field, needs that blade is arranged
Surface crater 2.
(3) according to above-mentioned cavitating flow specificity analysis as a result, the flow feature based on fluid in pit/groove, setting
For blade surface pit 2 between 20%~85% chord length of blade inlet edge, form is the conduit of the strip along spanwise direction,
Rectangle or round width or diameter are 1.4mm~2.8mm, and the single pit gross area and conduit area ratio are 45%；Pit is edge
Blade surface tangent line vertical direction processes to be formed.Fluid/retroeflection stream flows through pit and has an impact to cavitating flow.
(4) establish the structural model of blade surface particular configuration, and investigate the design structure for slow down cavitation inception and
The effect of development.As a result, it has been found that the low-pressure area on 1 surface of blade has apparent reduction, vacuole compared with not set surface crater 2
Body length shortens about 20%, and boundary layer separation point lag, blade trailing edge recirculating zone are thinned.Show this particular configuration design to sky
The nascent and development changed has good improvement result.
Claims (10)
1. a kind of particular configuration blade for improving surface cavitation flow behavior, which is characterized in that in the suction of hydraulic blade
Pit or groove (2) are distributed on face.
2. the particular configuration blade according to claim 1 for improving surface cavitation flow behavior, which is characterized in that described
Pit or groove (2) are arranged away between blade inlet edge 20%-85% chord length.
3. the particular configuration blade according to claim 1 or 2 for improving surface cavitation flow behavior, which is characterized in that institute
The width or diameter of the pit or groove (2) stated are the 2%-8% of chord length.
4. the particular configuration blade according to claim 1 or 2 for improving surface cavitation flow behavior, which is characterized in that institute
The depth of the pit or groove (2) stated is the 1%-8% of chord length.
5. the particular configuration blade according to claim 3 for improving surface cavitation flow behavior, which is characterized in that described
The depth of pit or groove (2) is the 1%-8% of chord length.
6. according to claim 1, improving the particular configuration blade of surface cavitation flow behavior described in 2 or 5, which is characterized in that
The distribution mode of the pit or groove (2) is single row or multiple rows.
7. the particular configuration blade according to claim 3 for improving surface cavitation flow behavior, which is characterized in that described
The distribution mode of pit or groove (2) is single row or multiple rows.
8. the particular configuration blade according to claim 4 for improving surface cavitation flow behavior, which is characterized in that described
The distribution mode of pit or groove (2) is single row or multiple rows.
9. according to claim 1, improving the particular configuration blade of surface cavitation flow behavior described in 2,5,7 or 8, feature exists
In circle or other forms that, the pit or groove (2) form are the conduit of strip or arcuation, aligned transfer.
10. the particular configuration blade according to claim 6 for improving surface cavitation flow behavior, which is characterized in that described
Pit or groove (2) form be the conduit of strip or arcuation, aligned transfer circle or other forms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810787133.6A CN108953217B (en) | 2018-07-18 | 2018-07-18 | Special-configuration blade for improving surface cavitation flow characteristic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810787133.6A CN108953217B (en) | 2018-07-18 | 2018-07-18 | Special-configuration blade for improving surface cavitation flow characteristic |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108953217A true CN108953217A (en) | 2018-12-07 |
| CN108953217B CN108953217B (en) | 2021-06-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810787133.6A Active CN108953217B (en) | 2018-07-18 | 2018-07-18 | Special-configuration blade for improving surface cavitation flow characteristic |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113404630A (en) * | 2021-07-12 | 2021-09-17 | 武汉大学 | Hydrofoil cavitation flow control structure |
| CN115929697A (en) * | 2023-01-20 | 2023-04-07 | 江苏大学 | Control structure for improving cavitation flow-induced vibration characteristic of hydrofoil |
| CN117236228A (en) * | 2023-11-13 | 2023-12-15 | 山东省科学院海洋仪器仪表研究所 | Tidal current energy water turbine blade optimization method |
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| CN105715582A (en) * | 2016-01-26 | 2016-06-29 | 大连理工大学 | Special blade structure for restraining cavitation and designing method thereof |
| JP2017020432A (en) * | 2015-07-13 | 2017-01-26 | 株式会社荏原製作所 | Impeller for pump, and pump including the same |
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| SU724803A1 (en) * | 1978-06-05 | 1980-03-30 | Предприятие П/Я В-8534 | Centrifugal-pump impeller |
| KR20080082082A (en) * | 2007-03-07 | 2008-09-11 | 현대중공업 주식회사 | The ship propeller has pressure equalized structure |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113404630A (en) * | 2021-07-12 | 2021-09-17 | 武汉大学 | Hydrofoil cavitation flow control structure |
| CN115929697A (en) * | 2023-01-20 | 2023-04-07 | 江苏大学 | Control structure for improving cavitation flow-induced vibration characteristic of hydrofoil |
| CN117236228A (en) * | 2023-11-13 | 2023-12-15 | 山东省科学院海洋仪器仪表研究所 | Tidal current energy water turbine blade optimization method |
| CN117236228B (en) * | 2023-11-13 | 2024-02-02 | 山东省科学院海洋仪器仪表研究所 | Tidal current energy water turbine blade optimization method |
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| CN108953217B (en) | 2021-06-18 |
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