CN107762966B - A kind of design method of high-efficiency helical sweepback axial wheel hydraulic model - Google Patents
A kind of design method of high-efficiency helical sweepback axial wheel hydraulic model Download PDFInfo
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- CN107762966B CN107762966B CN201710948115.7A CN201710948115A CN107762966B CN 107762966 B CN107762966 B CN 107762966B CN 201710948115 A CN201710948115 A CN 201710948115A CN 107762966 B CN107762966 B CN 107762966B
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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
- F04D29/181—Axial flow rotors
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Abstract
The invention discloses a kind of design methods of high-efficiency helical sweepback axial wheel hydraulic model, belong to hydrodynamic force engineering design technology field, including wheel hub, the blade being uniformly arranged in circumference of hub, design feature and actual operating mode for submersible axial flow pump propose reasonable wheel hub ratio, nD value, the geometric parameters such as consistency, blade is designed using reasonable circular rector and axis plane velocity changing rule, aerofoil profile stacking form, which is pressed, waits the leading edge of variable angle spirals variation to stack, blade shape uses swept-back, addition blade is antecurvature and applies the corresponding best kyphotic angle of optimization means optimization.The axial-flow pump impeller that the present invention designs, the media such as particle suspensions, fiber or biological floc can preferably be transported, it is outstanding without blocking and antiwind ability, good effect is achieved in actual sewage processing, suitable curved plunder can also improve " hump zone " being easy to appear in axial-flow pump, it is more steady to make to pump interior flowing, improves the runnability of axial-flow pump.
Description
Technical field:
The present invention relates to hydrodynamic force engineering design technology fields, and in particular to a kind of high-efficiency helical sweepback axial wheel waterpower
The design method of model.
Background technique:
With the continuous development of economy and society, submersible axial flow pump has biggish demand in market of sewage treatment, in agriculture
The fields such as field irrigation, municipal plumbing, water diversion project, electric power plant circulating water are widely used.
Currently, the submersible axial flow pump of domestic production, hydraulic model used is commonly the more mature dry type axis stream of domestic development
Outstanding hydraulic model is pumped, synthesis hydraulic performance can compare favourably with external product, some indexs have been even more than external similar production
Product.But these hydraulic models are applied in submersible axial flow pump, hydraulic performance sharp fall, efficiency reduction by 10%~
20%, the significant wastage of electric power energy is caused, the operating cost of pump is increased, it is not energy-efficient also uneconomical.On the other hand, dry type axis
Stream pump pumped (conveying) medium is clear water, and when work does not consider the abrasion of wheel member in actual condition, foreign matter winding and blocking etc..
Submerged axial-flow pump configuration is that motor combines as a whole with water pump, and motor flows through electronic in the top of water pump, medium
The annular channel of machine outer wall.Since the outer wall dimension of motor is determined by power and revolving speed, which limits diffusers
Outlet size also just defines guide vane angle of flare.Since the lower flange size of motor is larger, hub size is smaller, guide vane diffusion
Angle usual situation is bigger than normal very much, this results in divergence loss very big in diffuser, reduces the efficiency of water pump.
It to sum up states, the design method of dry type axial-flow pump impeller, can not be applied in the design of efficient submerged axial-flow impeller of pump,
Therefore, it is necessary to consider the structure and actual operating mode of submersible axial flow pump；Therefore, comparison diving and two kinds of submersible axial flow pumps of dry type
Structure type, adapt to the medium requirements of actual operating mode, explore and be suitable for the energy-efficient hydraulic model of submersible axial flow pump
Design method is extremely urgent.
Summary of the invention:
In order to make up the deficiency of prior art problem, the object of the present invention is to provide a kind of high-efficiency helical sweepback axial wheels
The design method of hydraulic model has the excellent performances such as energy-efficient, anti-cavitation performance is good, anti-blocking resistant wear and antiwind property are good.
Technical scheme is as follows:
The design method of high-efficiency helical sweepback axial wheel hydraulic model, which is characterized in that include the following steps,
1), impeller shape uses the structure type of swept-back, and blade sweepback angle is in 15 °~30 ° ranges, aerofoil profile heap
Folded to be stacked using leading edge, blade inlet edge is designed by equal variable angle spirals rule variation, blade by swirl distribution rule is become；
R=r1·eθtanβ；In formula:
- angle of sweep, degree；
r1Stream interface radius is intersected in-import with wheel hub, unit: rice；
r2Stream interface radius is intersected in-import with wheel rim, unit: rice；
β-isogonism angle changing, unit: degree；
R-stream interface radius, unit: rice；
The cornerite of θ-stream interface and inlet side intersection point, unit: degree；
2) it, corrects impeller outer diameter: boss shape is designed as taper, outer profile and guide vane are adapted, and are guaranteeing cavitation
Under the premise of impeller outer diameter is modified, using increase wheel hub ratio dh/ D mode, it is neutral to meet submersible axial flow pump actual motion
Energy parameter, i.e., according to the corresponding wheel hub ratio d of specific speed nsh/ D value, and guarantee nD value range and specific speed ns value range pair
It answers:
, in formula:
D-impeller outer diameter, rice；
dh/ D-hub ratio；
Q-flow, cubic meter is per hour；
N-revolving speed, rpm；
2), impeller hydraulic model chooses the number of blade: under the premise of taking into account efficiency and cavitation, selecting reasonable leaf grating dense
Degree increases root aerofoil profile length, reduces wheel rim aerofoil profile length, and the energy conversion of balanced each stream interface guarantees number of blade z according to than turning
Fast ns is chosen；
In formula:
L/t-cascade solidity；
R-stream interface radius, unit: rice；
H-lift, unit: rice；
N-revolving speed, unit: rev/min；
R-impeller radius, unit: rice；
K-correction factor；
3), blade is designed by swirl distribution rule is become: the total circular rector of blade being evenly distributed on each blade, then by change ring
Amount the regularity of distribution circular rector is assigned on each stream interface, change each stream interface circular rector radially according to certain rules, make root and
Blade load is small at outer rim, and intermediate stream interface blade load is big；
Kj=0.768g4.618 (r/R) -2.848 (r/R)2, in formula:
Kj- swirl distribution coefficient；
R-stream interface radius, unit: rice；
R-impeller radius, unit: rice；
4) lift resistance ratio, is designed using lift force method, and the aerofoil profile to match with required lift coefficient is selected to thicken, is selected
NACA series aerofoil sections sheet simultaneously carries out antecurvature optimization to impeller axis projection, and antecurvature angle is generally 8 °~14 °, finds out optimal
Angle.
The invention has the advantages that
The axial-flow pump impeller that the present invention designs can preferably transport Jie such as particle suspensions, fiber or biological floc
Matter, no blocking and antiwind ability are outstanding, achieve good effect in actual sewage processing, suitable curved plunder can also improve
" hump zone " being easy to appear in axial-flow pump, it is more steady to make to pump interior flowing, improves the runnability of axial-flow pump.
Detailed description of the invention:
Fig. 1 is submerged axial-flow pump impeller shaft of the present invention face perspective view；
Fig. 2 is the plane figure of axial-flow pump impeller of the invention.
Fig. 3 is the wheel hub under different specific speed ns of the present invention than value table.
Fig. 4 is different specific speed ns value of the present invention and the different corresponding tables of nD value.
Fig. 5 is the corresponding table of different specific speed ns of the present invention and different leaves number z, adjusted coefficient K.
Appended drawing reference: 1, impeller blade；2, impeller hub, 3, entrance edge of blade, 4, exit edge of blade, 5, impeller hub
Diameter dh, 6, impeller outer diameter D, 7-stream interface radius r, 8, angle of sweep9, stream interface radius r2,10, stream interface are intersected in import with wheel rim
With the wrap angle of inlet side intersection point, 11, stream interface radius r, 12, import intersect stream interface radius r1 with wheel hub.
Specific embodiment:
Referring to attached drawing:
The present invention uses blade swept-back, and aerofoil profile is pressed along leading edge waits the variation of variable angle spirals rule, uses between each stream interface
The lift method design for becoming circular rector, becoming axis plane velocity, the following are operating principles:
1, the shapes and sizes of wheel hub affect the fluidised form before fluid contact blade, also just influence the efficiency of impeller indirectly,
Boss shape of the present invention uses cone hub, and contour line cooperates gate vane channel shape, makes to flow much smoother.Due to submersible axial flow pump
Lower flange is larger, and guide vane angle of flare is too big, improves efficiency to reduce divergence loss, wheel hub ratio dh/ D is suitably increased, and is not turned on year-on-year basis
Wheel hub under fast ns can be found in attached drawing 3 than value:
2, impeller outer diameter D and revolving speed n is axial-flow pump important geometric parameter, and submersible axial flow pump performance parameter is equal in actual motion
There is different degrees of decline, original impeller outer diameter calculation formula need to be modified, calculation formula is as follows, but nD value analyzes water pump
The connection of energy and cavitation characteristics, it is necessary to assure pump nD value be no more than a zone of reasonableness, the specific value of different specific speed referring to
Attached drawing 4.
, in formula:
D-impeller outer diameter, unit: rice；
dh/ D-hub ratio；
Q-flow, unit: cubic meter/per hour；
N-revolving speed, unit: rev/min；
3, number of blade z is chosen by specific speed ns, and with reference to foreign outstanding water model, value is referring to following table.Cascade solidity l/t
It is the important parameter for influencing the efficiency of pump and cavitation performance, consistency crosses ambassador's friction loss increase, and efficiency reduces, and consistency is too small
It then needs to increase accordingly camber and blade angle, increases cavitation danger, suitably increase leaf in the case where taking into account efficiency and cavitation
The cascade solidity of root, guarantees as far as possible and the energy of outer rim aerofoil profile same degree is converted, balanced blade exit lift, reduces radial
Flowing, improves efficiency, and specific value refers to following formula, and wherein K is correction factor, and value is referring to attached drawing 5.
In formula:
L/t-cascade solidity；
R-stream interface radius, unit: rice；
H-lift, unit: rice；
N-revolving speed, unit: rev/min；
R-impeller radius, unit: rice；
K-correction factor；
4, non-interference it is assumed that using diving axis is more met based on blade infinite span and each stream interface layer when blade design
The change circular rector of the practical fluidised form of mixed-flow pump becomes axis plane velocity design method, selects reasonable blade ring quantitative change law, makes each stream
Face ring amount radially changes according to certain rules, keeps blade load at root and outer rim smaller, and intermediate stream interface blade load is larger,
Swirl distribution COEFFICIENT KjRecommend to be calculated with following following formula:
Kj=0.7684.618 (r/R) -2.848 (r/R)2, in formula:
Kj- swirl distribution coefficient；
R-stream interface radius, rice；
R-impeller radius, rice；
5, blade sweepback angleBigger, solid volume fraction is smaller on blade pressure surface, and solid phase Radial Flow is brighter
It is aobvious, the abrasion of blade pressure surface is greatly reduced, improves service life of the aial flow impeller in sewage treatment and reliable for operation
Property, but blade angle of sweepBigger, lift and efficiency are lower, therefore blade sweepback angleIn 15 °~30 ° ranges, occurrence
It can calculate according to the following formula:
In formula:
- angle of sweep, unit: degree；
r1Stream interface radius is intersected in-import with wheel hub, unit: rice；
r2Stream interface radius is intersected in-import with wheel rim, unit: rice；
β-isogonism angle changing, unit: degree；
6, NACA series aerofoil sections are chosen in the recommendation of sweepback impeller aerofoil profile, in the case where cavitation performance is up to standard using larger
Lift resistance ratio, and select with required lift coefficient CyMatched aerofoil profile is thickeied, lift coefficient CyIt is calculated as follows.Actually set
Aerofoil profile recommends NACA16, lift coefficient C in meteryValue is 0.4~0.6, is closer to axial-flow pump actual condition.
7, aerofoil profile is stacked is stacked using leading edge, is changed by equiangular helical spiral rule, Controlling outline curve such as following formula, blade axial plane figure
Antecurvature design is carried out using simple Bezier, antecurvature angle is generally 8 °~14 °, optimal angle can be found by optimization:
R=r1·eθtanβ, in formula:
r1Stream interface radius is intersected in-import with wheel hub, unit: rice；
β-isogonism angle changing, unit: degree；
R-stream interface radius, unit: rice；
The cornerite of θ-stream interface and inlet side intersection point, unit: degree；
The specific implementation process of the method for the present invention is provided below, design is suitable for conveying the submerged axial-flow impeller of pump of sewage
Steps are as follows:
1, impeller outer diameter D and revolving speed n is axial-flow pump important geometric parameter, and nD value analyzes pump Energy and cavitation characteristics
Connection, it is necessary to assure pump nD value is no more than a zone of reasonableness.
2, the shapes and sizes of wheel hub affect the fluidised form before fluid contact blade, also just influence the efficiency of impeller indirectly,
Boss shape of the present invention uses cone hub, and contour line cooperates gate vane channel shape, makes to flow much smoother；Due to submersible axial flow pump
Lower flange is larger, and guide vane angle of flare is too big, improves efficiency to reduce divergence loss, wheel hub dhIt suitably takes greatly, it can be in dry type axis
Increase 5% on the basis of stream pump impeller hub；
3, the number of blade refers to foreign outstanding water model, and 1000 specific speeds once take 4, more than 1000 specific speeds take 3.Leaf
Piece is non-interference based on blade infinite span and each stream interface layer when designing it is assumed that using the diving practical stream of axis mixed-flow pump is more met
The change circular rector of state becomes axis plane velocity design method, selects reasonable blade ring quantitative change law, makes each stream interface circular rector by certain
Rule radially change, keep blade load at root and outer rim smaller, intermediate stream interface blade load is larger；
4, cascade solidity is affected to submersible axial flow pump performance, and consistency crosses ambassador's friction loss increase, efficiency drop
Low, consistency is too small, needs to increase accordingly camber and blade angle, it is dangerous to increase cavitation.The case where taking into account efficiency and cavitation
The lower appropriate cascade solidity for increasing blade root, guarantees as far as possible and the energy of outer rim aerofoil profile same degree is converted, balanced blade exit
Lift reduces Radial Flow, improves efficiency；
5, blade sweepback angle is bigger, and solid volume fraction is smaller on blade pressure surface, and solid phase Radial Flow is more obvious,
The abrasion of blade pressure surface is greatly reduced, improves service life and operational reliability of the aial flow impeller in sewage treatment,
But blade angle of sweep is bigger, and lift and efficiency are lower, therefore blade sweepback angle is selected according to actual condition；
6, aerofoil profile is stacked is stacked using leading edge, by variation of variable angle spirals rule is waited, using biggish lift resistance ratio, and is selected
It is thickeied with the matched aerofoil profile of required lift coefficient, blade axial plane figure carries out antecurvature design using Bezier, can pass through
Optimum point is found in optimization.
The present invention is designed using the above method, and the impeller pattern obtained can well adapt to the structure of submersible axial flow pump
And application, keep submersible axial flow pump more efficient, anti-clogging and antiwind ability are stronger, reduce the operating cost of pump, reduce
Failure rate, enables the submersible axial flow pump long-term safety reliably operate.
Claims (1)
1. a kind of design method of high-efficiency helical sweepback axial wheel hydraulic model, which is characterized in that include the following steps,
1), impeller shape uses the structure type of swept-back, and blade sweepback angle is adopted in 15 ° ~ 30 ° ranges, aerofoil profile stacking
It is stacked with leading edge, blade inlet edge, which is pressed, waits the variation of variable angle spirals rule, and blade is by change swirl distribution rule design；
；, in formula:
- angle of sweep, degree；
r 1 Stream interface radius is intersected in-import with wheel hub, unit: rice；
r 2 Stream interface radius is intersected in-import with wheel rim, unit: rice；
β- isogonism angle changing, unit: degree；
r- stream interface radius, unit: rice；
θThe cornerite of-stream interface and inlet side intersection point, unit: degree；
2) it, corrects impeller outer diameter: boss shape being designed as taper, outer profile and guide vane are adapted, in the premise for guaranteeing cavitation
Under impeller outer diameter is modified, using increase wheel hub ratio dh/ D mode is joined with meeting performance in submersible axial flow pump actual motion
Number, i.e., according to the corresponding wheel hub ratio d of specific speed nsh/ D value, and guarantee that nD value range is corresponding with specific speed ns value range:
, in formula:
D- impeller outer diameter, rice；
d h /D- hub ratio；
Q- flow, cubic meter is per hour；
n- revolving speed, rpm；
3), impeller hydraulic model chooses the number of blade: under the premise of taking into account efficiency and cavitation, reasonable cascade solidity is selected,
Increase root aerofoil profile length, reduce wheel rim aerofoil profile length, the energy conversion of balanced each stream interface guarantees number of blade z according to specific speed
Ns is chosen；
, in formula:
l/t- cascade solidity；
r- stream interface radius, unit: rice；
H- lift, unit: rice；
n- revolving speed, unit: rev/min；
r- impeller radius, unit: rice；
K- correction factor；
4), blade is designed by swirl distribution rule is become: the total circular rector of blade being evenly distributed on each blade, then by change circular rector
Circular rector is assigned on each stream interface by the regularity of distribution, changes each stream interface circular rector radially according to certain rules, makes root and outer
Blade load is small at edge, and intermediate stream interface blade load is big；
, in formula:
K j - swirl distribution coefficient；
r- stream interface radius, unit: rice；
R- impeller radius, unit: rice；
5) lift resistance ratio, is designed using lift force method, and the aerofoil profile to match with required lift coefficient is selected to thicken, selects NACA
Series aerofoil sections sheet simultaneously carries out antecurvature optimization to impeller axis projection, and antecurvature angle is 8 ° ~ 14 °, finds out optimal corner.
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| CN108302062A (en) * | 2018-03-15 | 2018-07-20 | 中交疏浚技术装备国家工程研究中心有限公司 | Dredging pump impeller structure and its design method suitable for different soil properties |
| CN111677689A (en) * | 2020-06-23 | 2020-09-18 | 东方电气集团东方电机有限公司 | Design method of vibration and noise reduction mixed flow pump or axial flow pump |
| CN116428197B (en) * | 2023-05-17 | 2024-06-07 | 江苏大学 | Design method of emergency flood control water pump and high-speed cavitation-resistant impeller |
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| US7377313B2 (en) * | 2004-06-22 | 2008-05-27 | Baker Hughes Incorporated | Gas separator fluid crossover for well pump |
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| US4063849A (en) * | 1975-02-12 | 1977-12-20 | Modianos Doan D | Non-clogging, centrifugal, coaxial discharge pump |
| CN101245711A (en) * | 2007-02-16 | 2008-08-20 | 任明琪 | Axial flow impeller machine design method and blade |
| CN202431593U (en) * | 2011-11-03 | 2012-09-12 | 江苏国泉泵业制造有限公司 | Axial-flow pump impeller adopting spiral blades |
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