CN104462652B - A kind of design method of the integrated motor pump-jet propulsor hydraulic model of shaftless drive-type - Google Patents
A kind of design method of the integrated motor pump-jet propulsor hydraulic model of shaftless drive-type Download PDFInfo
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Abstract
The invention discloses a kind of design method of the shaftless integrated motor pump-jet propulsor hydraulic model of drive-type, it can design that spacious water efficiency is suitable with seven leaf highly skewed propellers, radiated noise is lower, motor and pump spray fully-integrated propeller.The parametrization ternary of pump fluid passage hydraulic parameters Selection and Design, stator before rotor and rearmounted impeller blade is reverse-engineered, air-gap-free pump spray open-water performance is checked, integrated electric-motor pump sprays propulsion, cavitation, noiseproof feature and strength check.The present invention devises the pump spray that a type is made up of the hypertrophic conduit, motor ring-shaped rotor, air gap, stator before rotor and the rearmounted impeller that embed motor stator.Propulsive efficiency 0.589, power 3.7MW, the latent device that the speed of a ship or plane 16 can be promoted to save.Several 9 leaves of the leaf of stator vane count 13, impeller blade, using the distribution of NACA16 profile thicknesses, and impeller has big skew back.The present invention can be directly used for realizing the shaftless electric propulsion of underwater hiding-machine, and design method has been also applied for axle type pump spray and the integrated electric-motor pump spray design of the rearmounted stator of torpedo.
Description
Technical field
, can more particularly to low noise and high critical speed of a ship or plane feature the present invention relates to marine propeller technical field
For the design method for the integrated motor pump-jet propulsor hydraulic model for realizing the shaftless Push Technology of underwater hiding-machine electric power.
Background technology
Pump-jet propulsor (Pumpjet, the spray of abbreviation pump) is a kind of rotary assembled hydrodynamic force propeller, by axial symmetry annular
Rotation and static leaf grating composition in conduit and conduit.Rotating cascade and static leaf grating are referred to as impeller and stator.Conduit
Section is usually airfoil type, is typically designed as deceleration type conduit, can flow through the water flow speed reduction of impeller blade to postpone cavitation
Produce, improve pump spray cavitation performance and radiated noise performance.Stator can be located at before impeller or after impeller, and it is preposition fixed to be referred to as
Minor pump sprays and the spray of rearmounted stator pump.The spray of stator before rotor formula pump is currently used primarily in nuclear submarine propulsion, rearmounted stator pump spray
It is currently used primarily in torpedo propulsion.Pump spray is similar to ducted propeller in shape, but impeller blade number is generally far more than blade
Number, generally higher than 7 leaves.The operation principle and the hydraulic propeller of above water craft propulsion of pump spray are similar, are also by by promoting
The momentum difference of device current determines to produce the size of net thrust.The outstanding advantages of pump spray are that radiated noise is low, the critical speed of a ship or plane is high.Noise
Low main cause is：1. the number of blade is more, and the load of unit blade area is small；2. conduit has certain shielding to radiated noise
And sound absorption；3. fluctuation pressure Amplitude Ration propeller is small, and the low frequency spectrum lines noise of generation is lower.The high main original of the critical speed of a ship or plane
Because being：Using stator before rotor and zero thrust or low thrust conduit, impeller influent stream condition can be effectively improved, reduces blade tip load,
So as to which the tip cavitation for postponing impeller blade is come into being opportunity.Low noise, the advantage of the high critical speed of a ship or plane determine that stator before rotor formula pump sprays
It is the preferable propeller of latent device.
The spray of submarine pump is originating from the spray of torpedo pump, the i.e. spray of stator before rotor formula pump by rearmounted stator pump sprays development evolvement.
Nineteen fifty-seven, ARL research institutes of University of Pennsylvania engineer's successful design is informed against the spray of platform rearmounted stator pump, and according to examination
Test and be applied successfully on MK48 heavy weight torpedos ([1] ARL review.Pumpjet development at ARL (ARL
The development of research institute's pump-jet propulsor), 2001.)；After about 20 years, the rearmounted stator pump sprays of another ARL come out and are employed
A brand-new epoch have been stepped into promoting, torpedo on advanced lightweight torpedo MK50.Currently, the high-speed torpedo of countries in the world
(being more than 45 sections) all uses rearmounted stator pump spray.Although the U.S. be that first grasp pump sprays designing technique in the world
Country, but be not first country for being applied to submarine propulsion.The current U.S., Britain, France and Russia in the world
Pump spray Push Technology nuclear submarine propulsion has been applied to all.Nineteen eighty-three, first, Britain is using the spray of stator before rotor formula pump
The military service of Trafalgar level (Trafalgar) nuclear powered attack submarines, indicates that the spray of the first type submarine propulsion pump is asked in the world
Generation." the extra large wolf level " submarine being on active service for 1997 and " Virginia level " submarine being on active service for 2004 employ stator before rotor formula pump
Spray, even more indicates that nuclear submarine pump spray Push Technology is grasped completely by west naval power.The spray of stator before rotor formula pump fails
The main cause of widespread adoption is obtained on conventional submarine is：Counterweight is difficult, radiated noise hardly possible is controlled, design difficulty is big.In order to
Counterweight and noise problem are solved, in pump spray patent disclosed in " alertness " level nuclear submarine Beng Pen manufacturer Rolls-Royce ([2]
Banks S, Fowler J O.Submersible propulsion unit (underwater propulsion unit), United States
Patent, No.US8147284B2,2012-4-3) the stator guide-tube structure that pump sprays is employed into carbon fibre composite, and leaf
Wheel still uses metal structure, such as nickel-aluminum-copper either steel.It is possible thereby to infer, the application of composite is that pump is sprayed into function
One of key technology promoted in nuclear submarine.But, the design of composite pump spray is built upon outstanding metal pump water spray power mould
On type design basis, that is to say, that the autonomous Design of outstanding pump spray hydraulic model is to realize that the spray of submarine pump promotes engineering should
One of Pinch technology.Outstanding concrete meaning is：Radiated noise is low, propulsive efficiency is moderate, high (the i.e. anti-cavitation of the critical speed of a ship or plane
Ability is strong).Currently, the domestic main cause for promoting latent device to be on active service of also being sprayed without a type autonomous Design pump is to be to lack outstanding
Pump sprays hydraulic model.
After design obtains outstanding pump spray hydraulic model, second step is to solve the low noise after pump spray coordinates with hull to ask
Topic.In " pump spray-hull " acoustic excitation system, except pump spray and hull itself radiated noise in addition to, pump spray pulsation thrust and
Torque encourages hull radiated noise to be also an important noise source by Propulsion Systems, and can not also find in a short time
Effectively suppress the measure of the noise source.Currently, seven leaf highly skewed propellers promote the radiation of submarine low-frequency range under low speed of a ship or plane state
Noise is especially prominent, be influence in, the key factor of low-frequency range radiated noise overall level.Also, the coupling of " oar-shafting-hull "
The important sources that vibration is low frequency spectrum lines are closed, are also that ought be difficult to one of Pinch technology gone beyond by interior noise reduction for the previous period.In order to
Cut off propeller sound source from source to propagate by shafting, USN and national defence pre research Plan Bureau (DARPA) are in 2004
Year, which combines, has initiated Tango Bravo projects.Five break-through skills first that the project plan is obtained are to realize shaftless propulsion,
To expect to suppress from source low frequency spectrum lines noise component(s) ([3] DARPA TANGO that propeller excitation is produced
BRAVO.16February 2011,USA.http://www.darpa.mil/sto/programs/tango/
index.html).In order to realize shaftless propulsion, plan " Ohio " level modified nuclear ballistic missile submarines being on active service in 2027
Integrated motor pump-jet propulsor ([4] Unite States Naval Institute, Ohio replacement will be used
program,USA,2012.12.Wikipedia)。
The integrated electric-motor pump spray of shaftless drive-type be integrated motor propulsor (Integrated Motor Propulsor,
IMP one kind), be by motor stator be embedded in pump spray conduit in, rotor and pump spray impeller blade blade tip integrate
A kind of synchronized propeller that there is air gap between rotating Vortex, motor stator and rotor.IMP is also known as wheel rim propeller,
Either ring drives formula propeller, is generally made up of conduit, motor and blade, without static leaf grating part, i.e., in no pump spray
Stator component.Integrated electric-motor pump spray is conventional IMP further development and improvement.Core technology advantage is：By electromotor no axis
Push Technology and pump spray promote the outstanding advantages of low noise, the high critical speed of a ship or plane fully-integrated, can play the pump spray sound of itself
Shafting sound source excitation system can be eliminated again by learning performance advantage.Meanwhile, propulsion electric machine is transplanted to behind propeller inside out of ship,
Effective utilization space in cabin can be substantially improved, this is also " outside ship of one of five key technologies in TANGO BRAVO projects
One of main purpose of arm discharge system " research and development.Therefore, integrated electric-motor pump spray will most possibly turn into shaftless electric propulsion
Preferred propeller.It is that motor is merged with the height that pump sprays both because integrated electric-motor pump sprays, so, it is suitable for what integrated motor was installed
The most key technology of design is just sprayed in pump water spray power modelling research and development into integrated electric-motor pump.
In terms of the design research and development of the integrated electric-motor pump spray hydraulic model of shaftless drive-type, published related text domestic at present
Offering report does not almost have.Retrieved in Chinese patent net by keyword of pump-jet propulsor, it is directly related with Ship Propeling
Only 4, include the patent of invention (publication number promoted using the spray of magnetic fluid reciprocating pump：A kind of CN1506267A, pump spray is pushed away
Enter device, 2004.06.), install impeller chimney additional and similar to the energy-saving pump spray formula propeller of waterborne vessel water jet propulsion pump in impeller outer
Utility model patent (publication number：CN202642077U, the energy-saving pump for ship and submarine sprays formula propeller,
2013.01.), using the waterborne vessel hydro-jet propulsion system patent of invention (publication number of swirl inducer：CN102849197A, pump spray
Propeller and the ship including it, 2013.01.), and it is (open suitable for the hydro-jet propulsion system patent of invention of waterborne vessel
Number：CN102007034A, the ship propulsion system with pumpjet propulsor, 2011.04.)；With wheel rim propeller and integrated motor
When propeller is that keyword is retrieved, only 4 related to Ship Propeling, and wherein it is suitable for only the 3 of submarine propulsion
, including：By multi-phase permanent motor, propeller and conduit constitute without hub integrated propeller patent of invention (publication number：
CN101546931A, a kind of integrated propeller, 2009.09), it is made up of magneto, propeller, conduit and solid non-rotating shaft
Have hub integrated motor propulsor patent of invention (publication number：CN102632982A, Shaftless driven type integrated motor propeller,
, and the bearing arrangement patent of invention (publication number for wheel rim propeller 2012.04)：CN102548840A, the propulsion of ship
The supporting member of device unit, 2010.05).In above-mentioned patent, only Shaftless driven type integrated motor propeller really is able to be applicable
In submarine propulsion.
International aspect, the U.S. patent Nos submarine ring drive motor propulsion plant (patent No.：US 8074592B2,
Submarine with a propulsion drive with an electric motor ring, 2011.12.) in it is specific
The structure arrangement and operation principle of single machine winding integrated motor propulsor, bi-motor winding integrated motor propulsor are elaborated,
There is good reference function for the successive projects application of integrated motor pump-jet propulsor of the invention.It is existing from the studies above and application
It is just at the early-stage that shape can be seen that domestic integrated electric-motor pump spray research and development.Present invention can effectively fill up domestic application neck
The lacuna in domain, it is strong to promote domestic latent device to promote the independent research and popularization and application sprayed with integrated electric-motor pump.The design method is same
Sample is applied to torpedo and promotes the design sprayed with integrated motor postposition stator pump.
The content of the invention：
The invention aims to solve problem present in above-mentioned background technology, for the integrated motor of shaftless drive-type
Pump spray hydraulic model there is provided the design method that a kind of design cycle is short, designing quality is high, can Reliable Design go out while having low
The shaftless pump spray hydraulic model made an uproar with high critical speed of a ship or plane feature, can be promoted for realizing shaftless electric propulsion under water.
In order to solve the above-mentioned technical problem the technical scheme that provides of the present invention is：
A kind of design method of the integrated motor pump-jet propulsor hydraulic model of shaftless drive-type, comprises the following steps：Step
1, the Selection and Design of pump fluid passage hydraulic parameters is carried out according to design requirement；Step 2, determine stator before rotor, rearmounted impeller and
The two-dimentional axis plane projection geometry of wall obtains being embedded in the two-dimentional axis plane projection geometry of primary pump spray before motor inside and outside conduit；Step 3,
Stator before rotor, the three-dimensional of rearmounted impeller are determined using parametrization ternary Reverse Design according to step 1 and step 2 acquired results
Geometry, the two-dimentional axis plane projection geometry of conduit is rotated vertically and obtains conduit 3 dimensional coil geometry, the stator before rotor,
The 3 dimensional coil geometry combination of rearmounted impeller and conduit obtains being embedded in the initial pump-jet propulsor hydraulic model before motor；Step 4,
The two-dimentional axis plane projection geometry of increase motor ring-shaped rotor and air gap in the two-dimentional axis plane projection geometry of pump spray obtained by step 2,
The two-dimentional axis plane projection geometry of motor ring-shaped rotor outside wall surface and air gap outer face is rotated in a circumferential direction obtain motor ring-shaped rotor and
The 3 dimensional coil geometry of air gap, the conduit 3 dimensional coil geometry obtained by step 3 is subtracted each other with air gap outer face boolean and is embedded in
Conduit 3 dimensional coil geometry after integrated motor, by the stator before rotor and the 3 dimensional coil geometry of rearmounted impeller obtained by step 3 with
Conduit 3 dimensional coil geometry combination after embedded integrated motor obtains integrated electric-motor pump spray hydraulic model；Step 5, using tackmeter
Fluid operator mechanics CFD approach calculates open-water performance of the integrated electric-motor pump spray hydraulic model under design speed and rotating speed, judges to disappear
Whether wasted work rate, pump hydraulic efficiency and pump spray propulsive efficiency meet design objective requirement, if so, then entering step 6, if it is not, then
Return to the blade surface load distribution of step 3 adjustment pump spray stator before rotor and rearmounted impeller blade during ternary reverse engineer
Rule, redesigns stator before rotor and rearmounted impeller 3 dimensional coil geometry；Step 6, consumption power, pump hydraulic efficiency and pump are solved
Spray propulsive efficiency meets the cavitating flow of the integrated electric-motor pump spray hydraulic model of design objective requirement, judges that cavitation area sprays with pump
Whether the ratio of rearmounted impeller disk area is more than 1%, if it is not, then entering step 7, if so, it is preposition then to return to step 3 adjustment pump spray
The blade surface load distribution rule of stator and rearmounted impeller blade during ternary reverse engineer, suppression cavitation is produced；Step
Rapid 7, the gained of solution procedure 6 meets consumption power, pump hydraulic efficiency, pump spray propulsive efficiency and the integrated motor of cavitation performance requirement
Pump sprays the unsteady transient flow field of hydraulic model, extracts the calculating knot of pump spray pulsation thrust and side force in time domain and frequency domain
Really；Step 8, the discrete line spectrum radiation of the integrated electric-motor pump spray hydraulic model pulsation thrust of the gained of solution procedure 7 and side force induction
The sound source level of noise, judges whether radiated noise sound source level meets design objective, if so, then entering step 9, if it is not, then returning to
Step 3 increases the rear side rake angle of rearmounted impeller blade and the front side rake angle of stator before rotor blade；Step 9, using finite element
The integrated electric-motor pump of the gained of method numerical value calculation procedure 8 sprays the intensity of hydraulic model, judges the pump spray under given material properties parameter
Whether intensity meets national military standard index request, if, it is determined that meet low noise, the integrated electric-motor pump of high critical speed of a ship or plane performance requirement
Hydraulic model is sprayed, the vane thickness recommended value recommended under material is provided, if it is not, then returning to increases vane thickness in step 5,
And then redefine pump spray hydraulic model.
It is preferred that the lift of hydraulic parameters including pump fluid passage in the step 1, flow, discharge area, specific speed and
5 parameters of suction inlet specific speed.
It is preferred that when primary pump spray two dimension axis plane projection geometry is determined in the step 2, stator before rotor and rearmounted impeller leaf
The ratio of piece spacing distance in the axial direction and impeller diameter is more than 10%；Impeller hub and wheel rim formation axial-flow type are cut
Face passage；Stator before rotor wheel rim is identical with rearmounted wheel rim diameter, and stator before rotor wheel hub and rearmounted impeller hub curvature are smooth
Transition；Section smoothly transits with stator before rotor wheel rim curvature in face of shrinkage type pipe inner wall, and shrinkage type pipe inner wall face back segment is with after
Wheel rim curvature is put to smoothly transit.
It is preferred that rearmounted impeller blade is circumferentially rotatable in the step 3, to the opposite direction skew back of rotation, and from blade root
To blade tip section to stem trim；The stator before rotor number of blade is 11 leaves or 13 leaves, rearmounted impeller blade number preferably 9 leaves；It is preposition fixed
Sub and rearmounted impeller blade is distributed using NACA16 profile thicknesses；Hypertrophic conduit is zero thrust or low thrust conduit, catheter drive
It is more than motor stator, rotor and air gap three's radial thickness sum to thickness.
It is preferred that using parametrization ternary Reverse Design design stator before rotor and rearmounted impeller leaf in the step 3
During piece geometry, stator before rotor blade lagging edge is using increment type swirl distribution, rearmounted impeller blade guide margin using quadratic power circular rector point
Cloth；Load type load distribution, blade tip section use front bearing type during the blade root section of stator before rotor and rearmounted impeller blade is used
Load distribution；Used at the guide margin of stator before rotor blade root section at small positive incidence, rearmounted impeller blade blade tip section lagging edge
Using small negative angle of attack.
It is preferred that the step of also including verifying gained initial pump-jet propulsor hydraulic model after the step 3：
Using Viscous calculation hydrodynamics CFD approach, the open-water performance of initial pump-jet propulsor hydraulic model is calculated, consumption work(is judged
Whether rate, pump hydraulic efficiency and the spacious water efficiency of pump spray meet design objective requirement, if so, then entering step 4, if it is not, then returning to
The axis plane projection geometry of step 2 adjustment pump spray stator before rotor, rearmounted impeller and conduit.
It is preferred that the axial length of step 4 rotor is equal to air gap axial length, electricity with 2 times of size of gaps sums
Machine rotor internal diameter and 2 times of rotor thickness and 2 times of size of gaps three sums are equal to air gap radical length.
It is preferred that when electric-motor pump water spray power model cavitating flow integrated with air gap is solved in the step 6, adoptable sky
Changing model includes Singhal models, Sauer models, Zwart models and improves Sauer cavitation models.
It is preferred that when the unsteady transient flow field of integrated electric-motor pump spray hydraulic model is solved in the step 7, yardstick can be used
Adapt to simulation SAS, separation whirlpool simulation DES or Large eddy simulation method LES, preferably SAS simulation.
It is preferred that the strength check in the step 9 includes static strength and fatigue resistance.
The present invention by rotor-propeller arrangement in wheel rim propeller be changed to rotor-pump spray stator before rotor and
Rearmounted blade wheel structure, makes blade be changed into stator and impeller blade.Rotor, pump spray rearmounted impeller and stator before rotor and embedded
The conduit of motor stator constitutes integrated electric-motor pump spray, and stator before rotor plays to provide for pump spray impeller influent stream and prewhirls, supports and lead simultaneously
Pipe and the effect that motor cable passage is provided.The integrated electric-motor pump water spray power design methods of shaftless drive-type of the present invention, tool
Have the distinguishing feature that the design cycle is short, designing quality is high, can Reliable Design go out while having low noise and high critical speed of a ship or plane feature
Shaftless pump spray hydraulic model.Using the design method, the integrated electric-motor pump spray of a type stator before rotor formula that successful design goes out, pump stream
Body passage hydraulic efficiency 85.62%, opens water efficiency 0.589, the non-cavitating generation when the speed of a ship or plane 16 is saved, 30 meters of the depth of water is following, can
Saved for the speed of a ship or plane 16, power 3.8MW latent device is promoted.In design method, by parameterize ternary reverse-engineer stator before rotor and
Rearmounted impeller blade geometry, is directly controlled the effective capacity for work of blade by blade surface load distribution rule, solves pump spray
Ensure propulsive efficiency, suppression cavitation simultaneously under conditions of diameter is certain and reduce the problem of fluctuation pressure.The design method is pushed away
The popularization and application that pump sprays Push Technology can be rapidly promoted after wide application.
By following description and with reference to accompanying drawing, the present invention will become more fully apparent, and these accompanying drawings are used to explain the present invention
Embodiment.
Brief description of the drawings
Fig. 1 is the integrated electric-motor pump water spray power modelling processes of research ＆ development figure of the embodiment of the present invention；
Fig. 2 is the pump spray hydraulic model axis plane projection geometry that the embodiment of the present invention is embedded in before integrated motor；
Fig. 3 is the axis plane projection geometry that the integrated electric-motor pump of the embodiment of the present invention sprays hydraulic model；
Fig. 4 is air gap axial plane perspective geometry enlarged drawing in the integrated electric-motor pump spray of the embodiment of the present invention；
Fig. 5 is the 3 dimensional coil geometry that the integrated electric-motor pump of the shaftless drive-type of the embodiment of the present invention sprays hydraulic model；
Fig. 6 is that the integrated electric-motor pump of the shaftless drive-type of the embodiment of the present invention sprays hydraulic model under design speed and design speed
Indulge velocity distribution map in secondary section.
Embodiment
Element numbers similar in embodiments of the invention, accompanying drawing, which are described, with reference now to accompanying drawing represents similar element.
Step S1, the Selection and Design of pump fluid passage hydraulic parameters is carried out according to design requirement
The pump fluid passage that stator before rotor and rearmounted impeller are constituted in pump spray is determined according to the speed of a ship or plane and power designs index
Five the Hydraulic Design parameters.
Effective power is obtained by the product of hull resistance and design speed, then by main frame rated power, rated speed, deceleration
Than according to hydraulic jet propulsion basic theories, the lift H, flow Q, discharge area A of pump fluid passage can be drawnj, specific speed NsAnd suction
Mouth specific speed parameter Nss, the process is referred to as the Selection and Design of pump fluid passage hydraulic parameters.Specifically, expression formula (1) is lift H
Expression formula, expression formula (2) be flow Q expression formula,
Wherein, ψ is leaving energy loss coefficient, and 0.01 is taken during analysis；β is the kinetic energy influence that hull boundary layer flow sprays on pump
Coefficient, is assumed to 0.87 during analysis；V0It is design speed；μ is injection ratio, and it is equal to muzzle velocity VjWith speed of a ship or plane V0Ratio, by
Ejection efficiency highest is determined；ηmIt is shafting transmission efficiency, 0.98 is taken during analysis；ηPIt is the efficiency of pump, 0.91 is taken during type selecting；ηrIt is pump
Relative rotative efficiency, takes 0.99 during analysis；PDIt is main frame power output corresponding with effective power, is known quantity；ρ is the close of water
Degree；G is acceleration of gravity.
Discharge area AjExpression formula is,
It can thus be concluded that outlet diameter is,
Wherein, DhFor outlet hub diameter, equal to the product of outlet diameter and hub diameter ratio, hub diameter ratio is according to specific speed and sets
Meter experience value.
The specific speed N of pump fluid passagesExpression formula is,
It is a characteristic, wherein, n (r/s) is rearmounted wheel speed and rotor rotating speed；The list of volume flow Q
Position is m3/ s, lift H unit are m.According to the design experiences of pump fluid passage, 1.46 ＜ NSPassage is designed as mixing during ＜ 3.66
Streaming, NSPassage is designed as axial-flow type during ＞ 3.66.
The suction inlet specific speed N of pump fluid passagessExpression formula is,
Wherein, rotating speed N unit is r/min, and NPSH is the net positive suction nozzle of pump fluid passage, means fluid channel inlet
Cavitation is avoided to produce required pressure,
Wherein, PaIt is atmospheric pressure, PvIt is pressure for vaporization, is taken as constant.Suction inlet specific speed correspondence one during cavitation inception
Specific critical value, directly reflects the anti-cavitation performance of fluid passage.
Step S2, determines stator before rotor, the two-dimentional axis plane projection geometry of wall is embedded in inside and outside rearmounted impeller and conduit
The two-dimentional axis plane projection geometry of primary pump spray before motor.
Fig. 2 show the rotation on axial plane before the spray of the integrated electric-motor pump of the present invention embedded integrated rotor and air gap
Perspective view, including stator before rotor wheel hub 1, stator before rotor blade 2, stator before rotor wheel rim 3, rearmounted impeller hub 4, rearmounted impeller leaf
Piece 5, rearmounted wheel rim 6, outlet wheel hub wall 7, section 8, pipe inner wall face back segment 9, conduit outer wall face 11 in face of pipe inner wall.
Shrinkage type pipe inner wall face back segment 9 smoothly transits with the rearmounted curvature of wheel rim 6 and is connected, in face of shrinkage type pipe inner wall section 8 with
The curvature of stator before rotor wheel rim 3 smoothly transits connection.Guide margin 12 and lagging edge 13, rearmounted impeller leaf in stator before rotor blade axis plane projection
Guide margin 14 and lagging edge 15 are straightway or SPL in piece axis plane projection.In rearmounted impeller blade axis plane projection
The distance between guide margin and lagging edge blade tip end points are less than motor ring-shaped rotor axial length.The leading portion of conduit outer wall face 11 is straight line
Section, back segment are gradual shrinkage SPL, are connected with pipe inner wall face outlet rounding.Rearmounted wheel rim diameter is equal to integrated motor
Rotor internal diameter, the diameter of conduit outer wall face straightway is more than motor preposition stator outer diameter, and motor preposition stator outer diameter is equal to motor
Rotor internal diameter, 2 times of rotor radial thickness, air gap, the sum of 2 times of motor preposition stator radial thickness four.Pipe inner wall face
The annulus area that import is formed is equal to 1.6 times of conduit outlet annulus area.
Step S3, it is preposition fixed to be determined according to step S1 and step S2 acquired results using parametrization ternary Reverse Design
The 3 dimensional coil geometry of sub, rearmounted impeller, the two-dimentional axis plane projection geometry of conduit is rotated vertically and obtains conduit three-dimensional geometry
Shape, the primary pump spray that the 3 dimensional coil geometry combination of the stator before rotor, rearmounted impeller and conduit obtains being embedded in before motor is pushed away
Enter device hydraulic model.
According to five the Hydraulic Design parameters of the pump fluid passage of step S1 settings, the stator before rotor given with reference to step S2
With the axis plane projection geometry of rearmounted impeller, stator before rotor and rearmounted impeller are drawn using parametrization ternary Reverse Design design
Blade 3 dimensional coil geometry.The core concept of the design method is：Blade 3 dimensional coil geometry is by hydrodynamic parameter (blade load
Distribution and outlet circulation distribution) and geometric parameter (axial plane geometry, leaf section thickness distribution and stacking angle) together decide on.It is preposition fixed
Blades lagging edge uses quadratic power swirl distribution using increment type swirl distribution, rearmounted impeller blade guide margin；Stator before rotor is with after
Put impeller blade blade root section use in load type load distribution, blade tip section use front bearing type load distribution；It is preposition fixed
Used at the guide margin of blades blade root section and small negative angle of attack is used at small positive incidence, rearmounted impeller blade blade tip section lagging edge.
Blade load distribution determines distribution of the leaf sectional pressure coefficient along chord length direction, and then directly determines its capacity for work and anti-
Cavitation performance；Outlet circulation is distributed in capacity for work and stator before rotor blade for controlling rearmounted impeller blade along span direction
Secondary flow, and then improve the interaction flow field between stator before rotor and rearmounted impeller, improve work doing efficiency.Stator before rotor leaf
Piece outlet circulation is equal with rearmounted impeller blade import circular rector.Blade face loads (pressure differential between blade face pressure face and suction surface)
With circumferentially average circular rector rVtDerivative on meridian streamline direction is closely related, and mathematical modeling is,
Wherein, VmIt is circumferentially average axis plane velocity, area two corresponding with diameter in axis projection equal to flow
The ratio of person；VtIt is circumferentially average tangential speed component, equal to circular rector rVtValue and the ratio of radius in axis projection, ring
Measure rVtIt is worth and is determined by lift and revolution speed,ηhFor hydraulic efficiency, initial value is taken as 0.92 during design；p+、p-Point
It is not the static pressure of blade pressure surface and suction surface, both differences are equal to blade and produce thrust；B is the number of blade, is empirically given,
Stator before rotor generally meets relatively prime relation, such as leaf of stator before rotor blade 13, the leaf of rearmounted impeller blade 9 with rearmounted impeller blade number；m
It is dimensionless meridian streamline length, is geometric parameter at the different spans of blade, is 0 to 1 from vane inlet to outlet value.This sets
Meter method was proposed by Mehrdad doctors Zangeneh of University College London in 1991 first.
After stator before rotor and rearmounted impeller 3 dimensional coil geometry is obtained, by conduit outer wall face, internal face leading portion, internal face
Back segment axis plane projection contour line, which rotates in a circumferential direction, obtains conduit 3 dimensional coil geometry, after stator before rotor, rearmounted impeller and catheter combination
Obtain being embedded in the pump spray hydraulic model before integrated motor.
Step S4, using sticky CFD computational methods, stable state solves the initial pump-jet propulsor waterpower before embedded integrated motor
The open-water performance of model.When CFD is calculated, including pump jet flow control domain grid is discrete, setting physical boundary conditions, flow field control
Equation solution, Flow Field Calculation result visualization post-process four steps.When grid is discrete, stator before rotor, rearmounted impeller and conduit
Export interior flow field and conduit External airflow field and preferentially use full hexahedron structure grid, meet the requirement of grid independence
Under the conditions of can effectively ensure that Flow Field Calculation precision.Physical boundary conditions are taken as speed import and pressure export, rearmounted wheel speed
For rated speed.When flow field control equation is solved, general CFD solvers are can select, including CFX, FLUENT, STARccm+ etc.,
It is preferential to use the mechanical solver of CFX Special rotaries.When governing equation is solved, fluid turbulence model is defeated from two equation shear stresses
Transport SST models.When Flow Field Calculation result visualization is post-processed, pump fluid passage lift, power and hydraulic efficiency are extracted, then extract
Pump, which sprays, asks for spacious water efficiency after thrust and torque, judge whether power and efficiency meet design requirement, if so, then entering step
S5, if it is not, then returning to the axis plane projection geometry of stator before rotor and rearmounted impeller in step S2 adjustment pumps fluid passage.
Step S5, the two of motor ring-shaped rotor and air gap are increased in the two-dimentional axis plane projection geometry of pump spray obtained by step S2
Axis plane projection geometry is tieed up, the two-dimentional axis plane projection geometry of motor ring-shaped rotor outside wall surface and air gap outer face is rotated in a circumferential direction and obtained
The 3 dimensional coil geometry of motor ring-shaped rotor and air gap, by the conduit 3 dimensional coil geometry obtained by step S3 and air gap outer face cloth
You subtract each other the conduit 3 dimensional coil geometry for obtaining being embedded in after integrated motor, by the stator before rotor obtained by step S3 and rearmounted impeller
3 dimensional coil geometry combines with the conduit 3 dimensional coil geometry after embedded integrated motor and obtains integrated electric-motor pump spray hydraulic model.
It is gentle that Fig. 3 show addition motor ring-shaped rotor in the two-dimentional axis plane projection geometry of pump spray before embedded integrated motor
The integrated two-dimentional axis plane projection geometry of electric-motor pump spray of band air gap obtained after gap.Fig. 4 show air gap axial plane perspective geometry and locally put
Big figure.Rotor internal diameter DriThe propeller power sent by motor determines that solving expression formula is,
PT=2kT[αsr(Dri+2hpole+lg)]2αsalaπn (9)
Wherein, kTFor motor torque constant coefficient, hpoleFor magnetic pole thickness, laFor the axial length of rotor, αsrAnd αsaPoint
Not Wei the radial and axial zoom factor of motor, it is empirically determined by design of electrical motor.lgFor size of gaps, axially and radially direction phase
Deng according to motor radiating amount and the horizontal value of motor insulating Design.By ring-shaped rotor outside wall surface 19 and the axial plane of air gap outer face 18
Projected outline, which rotates in a circumferential direction, obtains the 3 dimensional coil geometry of motor ring-shaped rotor and air gap.Former conduit 3 dimensional coil geometry and air gap
Outside wall surface boolean obtains being embedded in the conduit geometry of integrated motor after subtracting each other, combined with stator before rotor, rearmounted impeller and rotor
Obtain spraying the 3 dimensional coil geometry of hydraulic model afterwards with the integrated electric-motor pump of air gap.The diameter of air gap outer face horizontal segment is equal to motor
Stator before rotor internal diameter.Fig. 1 show the integrated electric-motor pump water spray power modelling processes of research ＆ development of shaftless drive-type of the present invention.Fig. 5
The integrated electric-motor pump of shaftless drive-type for showing the present invention sprays one embodiment of hydraulic model, including stator before rotor 2, rearmounted leaf
Wheel 5, motor ring-shaped rotor 16, air gap 17 and conduit 10.
Step S6, using sticky CFD computational methods, stable state solves the spacious water that the integrated electric-motor pump with air gap sprays hydraulic model
Performance.Solution procedure is identical with step S4.When Flow Field Calculation result visualization is post-processed, pump fluid passage lift, work(are extracted
Rate and hydraulic efficiency, then spacious water efficiency (propulsive efficiency) is asked for after extracting pump spray thrust and torque, judge design speed and rotating speed
Whether lower power, hydraulic efficiency and pump spray propulsive efficiency meet design objective requirement, if so, then entering step S7, if it is not, then returning
Load parameter during adjusting pump spray stator before rotor and the parametrization reverse engineer of rearmounted impeller blade ternary to step S3；
Step S7, solves the cavitating flow that hydraulic model is sprayed with the integrated electric-motor pump of air gap.Work(is met with what step S6 was obtained
Rate and the integrated electric-motor pump water spray power MODEL C FD computational flows result of efficient design requirement are initial value, and introducing cavitation model is solved
Integrated electric-motor pump sprays the cavitating flow of hydraulic model.When solution has cavitation multiphase flow turbulent flow, turbulence model still uses the equations of SST bis-
Model, cavitation model uses the modified Sauer cavitation models such as formula (1)：
Wherein,WithRepresent respectively water vapour evaporation (air bubble growth) and condense (bubble is crumbled and fall) process, evaporation with
Condensation coefficient takes C respectivelyprod=50 and Cdest=0.01, the average initial radium R of bubbleB=1.5 μm, αvAnd ρvRepresent that water steams respectively
Gas fraction and density, ρlThe density of water is represented, p represents Fluid pressure, pvPhase transformation critical pressure is represented, value is such as during calculating
Formula (11)：
Wherein, psatPressure for vaporization constant is represented, k represents Hydrodynamic turbulence energy, ρmFluid-mixing density is represented, is taken during calculating
Value such as formula (12)：
ρm=(αvρv+(1-αv-αg)ρl)/(1-fg) (12),
Wherein, αgAnd fgNot concretive gas core NCG volume fraction and mass fraction is represented respectively, and value is αg=7.8 ×
10-4And fg=1.0 × 10-6.For the three-phase mixed flow body being made up of water, water vapour and NCG, the volume fraction of each phase
Relational expression is satisfied by with mass fraction
In addition, solving when having cavitation multiphase flow turbulent flow of integrated electric-motor pump spray, cavitation model can also use such as formula
(13) Zwart models
Wherein, rnucFor gas nucleome fraction, RBFor gas nuclear radius, parameter value is rnuc=5.0 × 10-4,RB=2.0 ×
10-6,Fe=50, Fc=0.01.Hybrid density ρ=ρ=αvρv+(1-αv)ρl。
The Sauer models such as formula (14) can also be used by solving having for integrated electric-motor pump spray during cavitation multiphase flow turbulent flow：
Wherein,n0For constant.
After integrated electric-motor pump spray cavitating flow calculates convergence, the blade surface and air gap wall extracted in result of calculation is total
Cavitation area, judge whether the ratio of cavitation area and pump inlet area is more than 1%, if it is not, then enter step S8, if so,
The load distribution rule of blade surface during step S3 adjustment ternarys are reverse-engineered then is returned to, suppression cavitation is produced.
Fig. 6 be the present invention integrated electric-motor pump water spray power model embodiment design speed 16 section and design speed under by gluing
Property CFD calculate obtained vertical secondary section velocity distribution map, the inside and outside flowing of conduit as seen from Figure 6 divides without substantially flowing
Produced from secondary flow, interval interior more than 0.35 times of radius, rearmounted impeller blade wake flow has the circumferential speed point of very little
Amount, the matching design for showing both stator before rotor and rearmounted impeller is preferably.Table 1 is the integrated electric-motor pump of band air gap of the present invention
Power model embodiment of spraying water is saved and the integration power performance under design speed in design speed 16.The spacious water efficiency 0.589 of pump spray, it is slightly higher
In when the spacious water efficiency of the first seven leaf oar operating point.
The integrated electric-motor pump of table 1 sprays hydraulic model (13 leaf stator before rotors, the rearmounted impeller of 9 leaves) embodiment performance parameter
Step S8, solve meet power, efficiency and cavitation performance requirement with air gap integrated electric-motor pump spray hydraulic model
Thrust of pulsing and side force.Pump spray axially loaded is equal to thrust, and side force is the synthesis of cross force and radial load.With step S6 collection
It is initial value into electric-motor pump spray stable state result of calculation, pump spray pulsation thrust and side force is solved using unsteady transient simulation method.
Simulation (SAS), separation whirlpool simulation (DES) or Large eddy simulation method (LES) can be adapted to during solution using yardstick, preferentially using SAS
Simulation, can effectively shorten calculating cycle under conditions of pulsating force amplitude forecast precision is ensured.The governing equation of SAS-SST models
It is by increasing source item Q in the transport equation of turbulence vortex frequencies omegaSASTo realize.
Wherein,σ=2/3, C=2, κ=0.41.L is turbulent flow length dimension, LvKFor Feng Kamen length dimensions, S
For strain.
In addition, such as formula (16) can also be used when having cavitation multiphase turbulent flow in progress transient state solution integrated electric-motor pump spray
DES simulations, the mixed functions of SST models is made into further amendment when DES-SST is simulated,
Wherein,β '=0.09, μ is fluid viscosity, and Δ y is grid node wall distance.
The simulation of separation whirlpool DES and yardstick adapt to simulation SAS essential distinction be to be converted to when LES is solved to local mesh scale according to
Rely property stronger, belong to rigid conversion, and transfer process is realized by mixed function.
In addition, such as formula (17) can also be used when having cavitation multiphase turbulent flow in progress transient state solution integrated electric-motor pump spray
Large eddy simulation LES methods
Wherein, τijFor sub-grid scale model.
Step S9, solves the discrete lines spectral noise sound source level that integrated electric-motor pump sprays hydraulic model.Pulsating force source far-field radiation
Acoustic pressure expression formula is
Wherein, t' is lag time, and F is pulsation force vector, and r is point position vector, r be pulsating force source to measuring point away from
From c is the velocity of sound, and θ is angle between F and r vectors, and cos θ is used for the dipole sound field directive property for characterizing pulsating force source.Experience table
Bright, even if pulsating force source error reaches 30%, the sound radiation pressure spectrum level error tried to achieve by formula (18) is also only 3.1dB, meets work
Journey required precision.When 1m is arrived in measurement distance conversion, the sound radiation pressure spectrum level tried to achieve by formula (18) is discrete line spectrum sound source level.
After the discrete line spectrum sound source level for asking for integrated electric-motor pump spray hydraulic model, judge whether radiated noise meets design objective requirement,
If so, then entering step 10), if it is not, coming back to step S3 increases the rear side oblique angle and stator before rotor leaf of rearmounted impeller blade
The front side oblique angle of piece, obtains the big skew back pump spray three-dimensional geometry of integrated motor, step S3~S9 processes is repeated, until efficiency, sky
Change and noise objective is required to meet.
Step S10, power mould of being sprayed water to the integrated electric-motor pump of band air gap for meeting power, efficiency, cavitation and noise perfomiance requirements
Type carries out strength check.Finite element FEM methods are used during Strength co-mputation, solver can select ripe common finite element and solve
Device, such as ANSYS or NASTRAN.Strength check includes static strength and fatigue resistance.The hydrodynamic force of blade surface is carried when static strength is calculated
Lotus is calculated by stable state and obtained, and the hydrodynamic load of blade surface is calculated by transient state and obtained when fatigue resistance is calculated.Given blade material
After property parameters, including Materials Yield Limit, Poisson's ratio, Young's modulus and density, calculate hydrodynamic load, gravitational load and from
Blade maximum stress and maximum resultant displacement (strain) value under mental and physical efforts load collective effect, judge whether stress and strain meets
Index request of the national military standard to intensity.If so, then entering step S11, if it is not, then returning to step S3 increase leaf section thicknesses, weight
It is new to carry out power, efficiency, cavitation, noise and strength check.
Step S11, after efficiency, cavitation, noise and intensity are satisfied by design objective requirement, determines that shaftless drive-type is integrated
Electric-motor pump sprays hydraulic model, and provides the vane thickness distribution recommendation met under given material properties parameter.
Integrated electric-motor pump water spray power model optimization is applied to underwater submarine and unmanned bathyscaph is promoted, and is adopted in the step S3
Blade parameter ternary reverse engineer experience, which is equally applicable to routine, has the spray of axle drive-type stator before rotor pump and torpedo to promote
Sprayed and designed with integrated motor postposition stator pumps.
The present embodiment successful design one type power 3.713MW, hydraulic efficiency 85.62%, propulsive efficiency in practice
58.92%th, non-cavitating is produced, line spectrum noise 123dB integrated electric-motor pump sprays hydraulic model.
The present invention employs parametrization ternary Reverse Design design stator before rotor and rearmounted impeller in the design process
Blade 3 dimensional coil geometry, pulsed by CFD calculating verification pump spray propulsive efficiency and cavitation performance, according to pump spray thrust and side force
Verify pump spray noiseproof feature and calculated by FEM and check pump spray intensity, can quickly, Reliable Design goes out while meeting low noise, height
The critical speed of a ship or plane and the moderate integrated electric-motor pump spray hydraulic model of propulsive efficiency, can directly be applied to shaftless propulsion under water
Technology, has broad application prospects.
Claims (9)
1. a kind of design method of the integrated motor pump-jet propulsor hydraulic model of shaftless drive-type, it is characterised in that including as follows
Step：
Step 1, the Selection and Design of pump fluid passage hydraulic parameters is carried out according to design requirement；
Step 2, stator before rotor is determined, the two-dimentional axis plane projection geometry of wall obtains being embedded in before motor inside and outside rearmounted impeller and conduit
The two-dimentional axis plane projection geometry of primary pump spray；
Step 3, stator before rotor is determined using parametrization ternary Reverse Design according to step 1 and step 2 acquired results, it is rearmounted
The 3 dimensional coil geometry of impeller, the two-dimentional axis plane projection geometry of conduit is rotated vertically and obtains conduit 3 dimensional coil geometry, institute
The 3 dimensional coil geometry for stating stator before rotor, rearmounted impeller and conduit combines the initial pump-jet propulsor waterpower obtained being embedded in before motor
Model；
The initial pump-jet propulsor hydraulic model of gained is verified：Using Viscous calculation hydrodynamics CFD approach, calculate initial
The open-water performance of pump-jet propulsor hydraulic model, judges whether consumption power, pump hydraulic efficiency and the spacious water efficiency of pump spray meet and set
Index request is counted, if so, then entering step 4, if it is not, then returning to step 2 adjustment pump spray stator before rotor, rearmounted impeller and conduit
Axis plane projection geometry；
Step 4, the two-dimentional axial plane of motor ring-shaped rotor and air gap is increased in the two-dimentional axis plane projection geometry of pump spray obtained by step 2
Perspective geometry, the two-dimentional axis plane projection geometry of motor ring-shaped rotor outside wall surface and air gap outer face is rotated in a circumferential direction and obtains motor ring
The 3 dimensional coil geometry of shape rotor and air gap, the conduit 3 dimensional coil geometry obtained by step 3 is subtracted each other with air gap outer face boolean
Obtain being embedded in the conduit 3 dimensional coil geometry after integrated motor, by the three-dimensional several of the stator before rotor obtained by step 3 and rearmounted impeller
What shape combines with the conduit 3 dimensional coil geometry after embedded integrated motor and obtains integrated electric-motor pump spray hydraulic model；
Step 5, integrated electric-motor pump is calculated using Viscous calculation hydrodynamics CFD approach and sprays hydraulic model in design speed and rotating speed
Under open-water performance, judge consumption power, pump hydraulic efficiency and pump spray propulsive efficiency whether meet design objective requirement, if so,
Then enter step 6, if it is not, then returning to step 3 adjustment pump spray stator before rotor and rearmounted impeller blade in ternary reverse engineer process
In blade surface load distribution rule, redesign stator before rotor and rearmounted impeller 3 dimensional coil geometry；
Step 6, the integrated electric-motor pump spray that consumption power, pump hydraulic efficiency and pump spray propulsive efficiency meet design objective requirement is solved
The cavitating flow of hydraulic model, judges whether the ratio that cavitation area sprays rearmounted impeller disk area with pump is more than 1%, if it is not, then
Into step 7, if so, then returning to step 3 adjustment pump spray stator before rotor and rearmounted impeller blade during ternary reverse engineer
Blade surface load distribution rule, suppression cavitation produce；
Step 7, the gained of solution procedure 6 meets consumption power, pump hydraulic efficiency, pump spray propulsive efficiency and the collection of cavitation performance requirement
The unsteady transient flow field of hydraulic model is sprayed into electric-motor pump, the meter of pump spray pulsation thrust and side force in time domain and frequency domain is extracted
Calculate result；
Step 8, the discrete line spectrum radiation of the integrated electric-motor pump spray hydraulic model pulsation thrust of the gained of solution procedure 7 and side force induction
The sound source level of noise, judges whether radiated noise sound source level meets design objective, if so, then entering step 9, if it is not, then returning to
Step 3 increases the rear side rake angle of rearmounted impeller blade and the front side rake angle of stator before rotor blade；
Step 9, the intensity of hydraulic model is sprayed using integrated electric-motor pump obtained by finite element method numerical computations step 8, judges given
Whether the pump spray intensity under material properties parameter meets national military standard index request, if, it is determined that meet low noise, the high critical speed of a ship or plane
The integrated electric-motor pump spray hydraulic model of performance requirement, provides the vane thickness recommended value recommended under material, if it is not, then returning to
Increase vane thickness in step 3, and then redefine pump spray hydraulic model.
2. a kind of design method of shaftless integrated motor pump-jet propulsor hydraulic model of drive-type according to claim 1,
It is characterized in that：Hydraulic parameters include lift, flow, discharge area, specific speed and the suction inlet of pump fluid passage in the step 1
5 parameters of specific speed.
3. a kind of design method of shaftless integrated motor pump-jet propulsor hydraulic model of drive-type according to claim 1,
It is characterized in that：When primary pump spray two dimension axis plane projection geometry is determined in the step 2, stator before rotor and rearmounted impeller blade exist
The spacing distance of axial direction and the ratio of impeller diameter are more than 10%；Impeller hub and wheel rim formation axial-flow type section lead to
Road；Stator before rotor wheel rim is identical with rearmounted wheel rim diameter, and stator before rotor wheel hub smoothly transits with rearmounted impeller hub curvature；
Section smoothly transits with stator before rotor wheel rim curvature in face of shrinkage type pipe inner wall, shrinkage type pipe inner wall face back segment and rearmounted impeller
Wheel rim curvature smoothly transits.
4. a kind of design method of shaftless integrated motor pump-jet propulsor hydraulic model of drive-type according to claim 1,
It is characterized in that：Rearmounted impeller blade is circumferentially rotatable in the step 3, to the opposite direction skew back of rotation, and from blade root to leaf
Tip section is to stem trim；The stator before rotor number of blade is 11 leaves or 13 leaves, and rearmounted impeller blade number is 9 leaves；Stator before rotor is with after
Impeller blade is put to be distributed using NACA16 profile thicknesses；Hypertrophic conduit is zero thrust or low thrust conduit, conduit radial thickness
More than motor stator, rotor and air gap three's radial thickness sum.
5. a kind of design method of shaftless integrated motor pump-jet propulsor hydraulic model of drive-type according to claim 1,
It is characterized in that：It is several using parametrization ternary Reverse Design design stator before rotor and rearmounted impeller blade in the step 3
When, stator before rotor blade lagging edge uses quadratic power swirl distribution using increment type swirl distribution, rearmounted impeller blade guide margin；Before
Put stator and rearmounted impeller blade blade root section use in load type load distribution, blade tip section using the load point of front bearing type
Cloth；Used at the guide margin of stator before rotor blade root section at small positive incidence, rearmounted impeller blade blade tip section lagging edge using small
Negative angle of attack.
6. a kind of design method of shaftless integrated motor pump-jet propulsor hydraulic model of drive-type according to claim 1,
It is characterized in that：The axial length of step 4 rotor is equal to air gap axial length with 2 times of size of gaps sums, and motor turns
Sub- internal diameter, 2 times of rotor thickness and 2 times of size of gaps three sums are equal to air gap radical length.
7. a kind of design method of shaftless integrated motor pump-jet propulsor hydraulic model of drive-type according to claim 1,
It is characterized in that：When electric-motor pump water spray power model cavitating flow integrated with air gap is solved in the step 6, adoptable cavitation mould
Type includes Singhal models, Sauer models, Zwart models and improves Sauer cavitation models.
8. a kind of design method of shaftless integrated motor pump-jet propulsor hydraulic model of drive-type according to claim 1,
It is characterized in that：When the unsteady transient flow field of integrated electric-motor pump spray hydraulic model is solved in the step 7, it can be adapted to using yardstick
Simulate SAS, separation whirlpool simulation DES or Large eddy simulation method LES.
9. a kind of design method of shaftless integrated motor pump-jet propulsor hydraulic model of drive-type according to claim 1,
It is characterized in that：Strength check in the step 9 includes static strength and fatigue resistance.
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