CN104462652A - Design method of hydraulic model of shaftless drive type integrated motor pump jet - Google Patents

Abstract

The invention discloses a design method of a hydraulic model of a shaftless drive type integrated motor pump jet. By means of the method, the propeller which is equal to a seven-blade highly skewed propeller in open water efficiency and lower in radiation noise can be designed, wherein a motor and the pump jet are completely integrated. The method comprises the steps of a pump fluid channel hydraulic parameter type selection design, a parametric three-dimension reversal design of pre-positioned stator and post-positioned impeller blades, non-air-gap pump jet open water performance checking, and propelling, cavitation and noise performance and strength checking of the integrated motor pump jet. The pump jet which is composed of a thick guide pipe of an embedded motor stator, a motor annular rotor, an air gap, a pre-positioned stator and a post-positioned impeller is designed. The propelling efficiency is 0.589, the power is 3.7 MW and the pump jet can propel submersible vehicles with the navigational speed being 16 knots. The number of the stator blades is 13, the number of the impeller blades is 9, an NACA 16 wing type thickness distribution method is adopted for the stator blades and the impeller blades, and the impeller is highly skewed. The design method can be directly used for realizing shaftless electric propelling of unverwater vehicles, and is also suitable for shaft type pump jets and torpedo post-positioned stator type integrated motor pump jets.

Description

A kind of method for designing of shaftless drive-type integrate motor pump-jet propulsor hydraulic model

Technical field

The present invention relates to marine propeller technical field, particularly relate to and there is low noise and the critical speed of a ship or plane feature of height, may be used for the method for designing of the integrate motor pump-jet propulsor hydraulic model realizing the shaftless Push Technology of underwater hiding-machine electric power.

Background technology

Pump-jet propulsor (Pumpjet is called for short pump spray) is a kind of rotary assembled hydrodynamic force thruster, is made up of the rotation in rotational symmetry ring duct and conduit and static leaf grating.Rotating cascade and static leaf grating are called impeller and stator.Conduit section is generally airfoil type, is generally designed to deceleration type conduit, the water flow speed reduction flowing through impeller blade can be made to produce to postpone cavitation, improve pump spray cavitation performance and radiated noise performance.Before stator can be positioned at impeller or after impeller, be called the spray of stator before rotor formula pump and the spray of rearmounted stator pump.The spray of stator before rotor formula pump is mainly used in nuclear submarine at present and advances, and rearmounted stator pump spray is mainly used in torpedo at present and advances.Pump spray is similar to ducted propeller in shape, but impeller blade number is usually far more than number of blade, is generally greater than 7 leaves.The hydraulic propeller that the principle of work of pump spray and above water craft advance roughly the same, is also the size being determined to produce net thrust by the momentum difference by thruster current.The outstanding advantages of pump spray is that low, the critical speed of a ship or plane of radiated noise is high.The main cause that noise is low is: 1. the number of blade is many, and the load of unit blade area is little; 2. conduit has certain shielding and sound absorption to radiated noise; 3. fluctuation pressure Amplitude Ration screw propeller is little, and the low frequency spectrum lines noise of generation is lower.The main cause that the critical speed of a ship or plane is high is: adopt stator before rotor and zero thrust or low thrust conduit, effectively can improve impeller influent stream condition, reduces blade tip load, thus the tip cavitation postponing impeller blade is come into being opportunity.It is the desirable thruster of latent device that the advantage of low noise, the high critical speed of a ship or plane determines the spray of stator before rotor formula pump.

The spray of submarine pump originates from the spray of torpedo pump, and namely the spray of stator before rotor formula pump sprays development evolvement by rearmounted stator pump.Nineteen fifty-seven, University of Pennsylvania's ARL research institute slip-stick artist successful design is informed against the spray of platform rearmounted stator pump, and according to test it to be successfully applied on MK48 heavy weight torpedo ([1] ARL review.Pumpjet development at ARL (development of ARL research institute pump-jet propulsor)., 2001.); After about 20 years, the spray of another ARL rearmounted stator pump is come out and is applied on advanced lightweight torpedo MK50, makes torpedo propelling step into brand-new epoch.Current, what the high-speed torpedo (being greater than 45 joints) of countries in the world all adopted is the spray of rearmounted stator pump.Although the U.S. is the country of first grasp pump spray designing technique in the world, is not first country being applied to submarine propulsion.Pump has all been sprayed Push Technology and has been applied to nuclear submarine propelling by the current U.S., Britain, France and Russia in the world.Nineteen eighty-three, first, Britain adopts the military service of Trafalgar level (Trafalgar) nuclear powered attack submarines of stator before rotor formula pump spray, indicates that the first type submarine propulsion pump spray is come out in the world." the extra large wolf level " submarine of being on active service for 1997 and " Virginia level " submarine of being on active service for 2004 all have employed the spray of stator before rotor formula pump, indicate that nuclear submarine pump spray Push Technology is grasped completely by west naval power especially.The main cause that the spray of stator before rotor formula pump fails to obtain widespread adoption on conventional submarine is: counterweight difficulty, the difficult control of radiated noise, design difficulty are large.In order to solve counterweight and noise problem, ([2] Banks S in pump spray patent disclosed in " alertness " level nuclear submarine Beng Pen manufacturer Rolls-Royce, 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 be have employed carbon fibre composite, and impeller still adopts metal construction, as nickel-Solder for Al-Cu Joint Welding or steel.Can infer thus, the application of compound substance is that pump spray is used successfully to one of gordian technique of nuclear submarine propelling.But the design of compound substance pump spray is based upon on outstanding metal pump water spray power pattern layouts, that is, the autonomous Design of outstanding pump spray hydraulic model is one of Pinch technology realizing the application of submarine pump spray forward engineer.Outstanding concrete meaning is: radiated noise is low, propulsive efficiency is moderate, the critical speed of a ship or plane high (namely anti-cavitation ability is strong).Current, namely the domestic main cause also not having a type autonomous Design pump spray to advance device of diving to be on active service is to lack outstanding pump spray hydraulic model.

After design obtains outstanding pump spray hydraulic model, namely second step is solve pump to spray the low noise problem after coordinating with hull.In " pump spray-hull " acoustic excitation system, except pump spray and hull self radiated noise except, it is also an important noise source that pump spray pulsation pushes away force and moment by Propulsion Systems excitation hull radiated noise, and also cannot find the effective measure suppressing this noise source at short notice.Current, seven leaf highly skewed propellers advance the radiated noise of submarines low-frequency ranges under low speed of a ship or plane state particularly outstanding, are in impact, the key factor of low-frequency range radiated noise overall level.Further, the coupled vibrations of " oar-axle system-hull " is the important sources of low frequency spectrum lines, is also to be difficult to one of Pinch technology gone beyond by interior noise reduction for the previous period.Propagated by axle system to cut off thruster sound source from source, USN and national defence pre research Plan Bureau (DARPA) combined in 2004 and have initiated Tango Bravo project.Namely five break-through skill Article 1 that this project plan obtains are realize shaftless propelling, to expect to suppress thruster to encourage the low frequency spectrum lines noise component ([3] DARPA TANGO BRAVO.16February 2011, USA.http: //www.darpa.mil/sto/programs/tango/index.html) produced from source.In order to realize shaftless propelling, " Ohio " the level modified nuclear ballistic missile submarines planning to be on active service in 2027 will adopt integrate motor pump-jet propulsor ([4] Unite States NavalInstitute, Ohio replacement program, USA, 2012.12.Wikipedia).

Shaftless drive-type integrated electric pump spray is integrated motor propulsor (Integrated MotorPropulsor, IMP) one, be motor stator is embedded in pump spray conduit, blade tip that rotor and pump spray impeller blade integrates synchronized rotating Vortex, there is a kind of thruster of air gap between motor stator and rotor.IMP is also called wheel rim thruster, or ring drives formula thruster, is usually made up of conduit, motor and blade, does not have static leaf grating parts, the stator component in namely not having pump to spray.The spray of integrated electric pump is further developing and improving of conventional IMP.Core technology advantage is: electromotor no axis Push Technology and pump are sprayed and advance the outstanding advantages of low noise, the high critical speed of a ship or plane fully-integrated, can play the acoustical behavior advantage of pump spray itself, can eliminate axle system sound source excitation system again.Meanwhile, after propulsion electric machine is transplanted to thruster inside in ship, greatly can improves in cabin and effectively utilize space, this is also one of fundamental purpose that in TANGO BRAVO project, " the outer arm discharge system of ship " of one of five gordian techniquies is researched and developed.Therefore, the spray of integrated electric pump will most possibly become the first-selected thruster of shaftless electric propulsion.Because the spray of integrated electric pump is that height both motor and pump sprays merges, so, be suitable for the pump water spray power modelling that integrate motor installs and research and develop the most key technology just having become the spray of integrated electric pump to design.

In the design research and development of shaftless drive-type integrated electric pump water spray power model, current domestic published pertinent literature report does not almost have.Be that keyword is retrieved with pump-jet propulsor in Chinese patent net, directly related with Ship Propeling only has 4, comprise the patent of invention (publication number: CN1506267A adopting the spray of magnetic fluid reciprocating pump to advance, a kind of pump-jet propulsor, 2004.06.), install impeller chimney additional at impeller outer and be similar to the angle of rake utility model patent of the energy-saving pump spray formula (publication number: CN202642077U of waterborne vessel water jet propulsion pump, energy-saving pump for boats and ships and submarine sprays formula thruster, 2013.01.), adopt the waterborne vessel hydro-jet propulsion system patent of invention (publication number: CN102849197A of swirl inducer, pump-jet propulsor and comprise its boats and ships, 2013.01.), and be applicable to the hydro-jet propulsion system patent of invention (publication number: CN102007034A of waterborne vessel, there is the ship propulsion system of pumpjet propulsor, 2011.04.), with wheel rim thruster and integrated motor propulsor for keyword retrieve time, relevant to Ship Propeling only has 4, and be wherein suitable for submarine propulsion only have 3, comprise: by multi-phase permanent motor, screw propeller and conduit form without hub integrated propeller patent of invention (publication number: CN101546931A, a kind of integrated propeller, 2009.09), by magneto, screw propeller, what conduit and solid non-rotating shaft were formed has hub integrated motor propulsor patent of invention (publication number: CN102632982A, shaftless drive-type integrated motor propulsor, 2012.04), and for the angle of rake bearing arrangement patent of invention (publication number: CN102548840A of wheel rim, the supporting member of the propeller unit of ship, 2010.05).In above-mentioned patent, only there is shaftless drive-type integrated motor propulsor really can be applicable to submarine propulsion.

International aspect, the U.S. patent Nos submarine ring drive motor propulsion plant (patent No.: US 8074592 B2, Submarine with a propulsion drive with an electricmotor ring, 2011.12.) be specifically described single motor winding integrated motor propulsor, the structural arrangement of bi-motor winding integrated motor propulsor and principle of work in, the successive projects application for integrate motor pump-jet propulsor of the present invention has good reference function.As can be seen from above-mentioned status quo, domestic integrated electric pump spray research and development are just at the early-stage.Content of the present invention effectively can fill up the lacuna of this application domestic, promotes the independent research of domestic latent device propelling integrated electric pump spray effectively and applies.This method for designing is equally applicable to the design of the rearmounted stator pump spray of torpedo propelling integrate motor.

Summary of the invention:

The object of the invention is to solve Problems existing in above-mentioned background technology, for shaftless drive-type integrated electric pump water spray power model, the method for designing that a kind of design cycle is short, designing quality is high is provided, can go out to have the shaftless pump spray hydraulic model of low noise and height critical speed of a ship or plane feature by Reliable Design simultaneously, can promote for realizing shaftless electric propulsion under water.

In order to solve the problems of the technologies described above technical scheme provided by the invention be:

A method for designing for shaftless drive-type integrate motor pump-jet propulsor hydraulic model, comprises the steps: step 1, carries out the Selection and Design of pump fluid passage hydraulic parameters according to designing requirement, step 2, determines that the primary pump before the two-dimentional axis plane projection geometry of wall obtains embedding motor inside and outside stator before rotor, rearmounted impeller and conduit sprays two-dimentional axis plane projection geometry, step 3, the 3 dimensional coil geometry of parametrization ternary Reverse Design determination stator before rotor, rearmounted impeller is adopted according to step 1 and step 2 acquired results, rotated vertically by the two-dimentional axis plane projection geometry of conduit and obtain conduit 3 dimensional coil geometry, the 3 dimensional coil geometry combination of described stator before rotor, rearmounted impeller and conduit obtains the initial pump-jet propulsor hydraulic model before embedding motor, step 4, the two-dimentional axis plane projection geometry increasing motor ring-shaped rotor and air gap is sprayed in two-dimentional axis plane projection geometry in the pump of step 2 gained, 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 the 3 dimensional coil geometry of motor ring-shaped rotor and air gap, the conduit 3 dimensional coil geometry of step 3 gained and air gap outer face boolean are subtracted each other and obtains the conduit 3 dimensional coil geometry after embedding integrate motor, by the 3 dimensional coil geometry of the stator before rotor of step 3 gained and rearmounted impeller with embed integrate motor after conduit 3 dimensional coil geometry combine and obtain integrated electric pump and to spray water power model, step 5, Viscous calculation fluid mechanics CFD method is adopted to calculate the open-water performance of integrated electric pump water spray power model under design speed and rotating speed, judge whether consumed power, pump hydraulic efficiency and pump spray propulsive efficiency meets design objective requirement, if, then enter step 6, if not, then get back to step 3 and adjust pump spray stator before rotor and the blade surface load distribution rule of rearmounted impeller blade in ternary reverse engineer process, redesign stator before rotor and rearmounted impeller 3 dimensional coil geometry, step 6, solve the cavitating flow that consumed power, pump hydraulic efficiency and pump spray propulsive efficiency meets the integrated electric pump water spray power model of design objective requirement, judge whether the ratio that cavitation area and pump spray rearmounted impeller disk area is greater than 1%, if not, then enter step 7, if so, then get back to step 3 and adjust pump spray stator before rotor and the blade surface load distribution rule of rearmounted impeller blade in ternary reverse engineer process, suppress cavitation to produce, step 7, solution procedure 6 gained meets the unsteady flo w transient flow field of integrated electric pump water spray power model of consumed power, pump hydraulic efficiency, pump spray propulsive efficiency and cavitation performance requirement, extracts pump spray pulsation thrust and the result of calculation of side force in time domain and frequency domain, step 8, the sound source level of the discrete line spectrum radiated noise of solution procedure 7 gained integrated electric pump water spray power model pulsation thrust and side force induction, judge whether radiated noise sound source level meets design objective, if, then enter step 9, if not, then get back to step 3 and increase the rear side rake angle of rearmounted impeller blade and the front side rake angle of stator before rotor blade, step 9, adopt the intensity of Finite Element Method numerical evaluation step 8 gained integrated electric pump water spray power model, judge whether the pump spray intensity under given material properties parameter meets national military standard index request, if, then determine the integrated electric pump water spray power model meeting low noise, high critical speed of a ship or plane performance requirement, provide the vane thickness recommended value under recommendation material, if not, then get back in step 5 and increase vane thickness, and then redefine pump spray hydraulic model.

Preferably, in described step 1, hydraulic parameters comprises the lift of pump fluid passage, flow, discharge area, specific speed and suction inlet specific speed 5 parameters.

Preferably, when determining in described step 2 that primary pump sprays two-dimentional axis plane projection geometry, stator before rotor and rearmounted impeller blade are greater than 10% at the spacing distance of axial direction and the ratio of impeller diameter; Impeller hub and wheel rim form axial-flow type cross-sectional passage; Stator before rotor wheel rim is identical with rearmounted wheel rim diameter, and stator before rotor wheel hub and rearmounted impeller hub curvature smoothly transit; In face of shrinkage type pipe inner wall, section and stator before rotor wheel rim curvature smoothly transit, and shrinkage type pipe inner wall face back segment and rearmounted wheel rim curvature smoothly transit.

Preferably, in described step 3, rearmounted impeller blade circumferentially rotates, to the opposite direction skew back rotated, and from blade root to blade tip cross section to stem trim; The stator before rotor number of blade is 11 leaves or 13 leaves, rearmounted impeller blade number preferably 9 leaves; Stator before rotor and rearmounted impeller blade adopt the distribution of NACA16 profile thickness; Hypertrophic conduit is zero thrust or low thrust conduit, and conduit radial thickness is greater than motor stator, rotor and air gap three radial thickness sum.

Preferably, when adopting parametrization ternary Reverse Design to design stator before rotor and rearmounted impeller blade geometry in described step 3, stator before rotor blade lagging edge adopts increment type swirl distribution, rearmounted impeller blade guide margin to adopt quadratic power swirl distribution; Carry type load distribution during the blade root cross section of stator before rotor and rearmounted impeller blade all adopts, blade tip cross section carries type load distribution before all adopting; Guide margin place, stator before rotor blade root cross section adopts little positive incidence, and lagging edge place, rearmounted impeller blade blade tip cross section adopts little negative angle of attack.

Preferably, the step that the initial pump-jet propulsor hydraulic model of gained is verified also is comprised: adopt Viscous calculation fluid mechanics CFD method after described step 3, calculate the open-water performance of initial pump-jet propulsor hydraulic model, judge whether the spacious water efficiency of consumed power, pump hydraulic efficiency and pump spray meets design objective requirement, if, then enter step 4, if not, then get back to the axis plane projection geometry that step 2 adjusts pump spray stator before rotor, rearmounted impeller and conduit.

Preferably, the axial length of described step 4 rotor and 2 times of size of gaps sums equal air gap axial length, and rotor internal diameter and 2 times of rotor thickness and 2 times of size of gaps three sums equal air gap radical length.

Preferably, when solving band air gap integrated electric pump water spray power model cavitating flow in described step 6, adoptable cavitation model comprises Singhal model, Sauer model, Zwart model and improves Sauer cavitation model.

Preferably, when solving integrated electric pump water spray power model unsteady flo w transient flow field in described step 7, yardstick can be adopted to adapt to simulation SAS, separated vorticcs analog D ES or Large eddy simulation method LES, preferred SAS simulation.

Preferably, the strength check in described step 9 comprises static strength and fatigue resistance.

Rotor-propeller arrangement in wheel rim thruster is changed into rotor-pump spray stator before rotor and rearmounted blade wheel structure by the present invention, makes blade become stator and impeller blade.The conduit that rotor, pump spray rearmounted impeller and stator before rotor and embedded motor stator forms integrated electric pump and sprays, stator before rotor play simultaneously prewhirl for pump spray impeller influent stream provides, supporting tube and the effect of motor cable passage is provided.Shaftless drive-type integrated electric pump water spray power design methods of the present invention, has the distinguishing feature that the design cycle is short, designing quality is high, can go out to have the shaftless pump spray hydraulic model of low noise and height critical speed of a ship or plane feature by Reliable Design simultaneously.Apply this method for designing, the type stator before rotor formula integrated electric pump spray that successful design goes out, pump fluid passage hydraulic efficiency 85.62%, spacious water efficiency 0.589, save at the speed of a ship or plane 16, the depth of water less than 30 meters time non-cavitating produce, can be used in that the speed of a ship or plane 16 saves, the latent device of power 3.8MW advance.In method for designing, by parametrization ternary reverse engineer stator before rotor and rearmounted impeller blade geometry, directly control the effective capacity for work of blade by blade surface load distribution rule, solve the difficult problem simultaneously ensureing propulsive efficiency, suppression cavitation and reduction fluctuation pressure under pump is sprayed on the certain condition of diameter.This method for designing can promote after applying that pump sprays the popularization and application of Push Technology fast.

By following description also by reference to the accompanying drawings, the present invention will become more clear, and these accompanying drawings are for explaining embodiments of the invention.

Accompanying drawing explanation

Fig. 1 is the integrated electric 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 before the embodiment of the present invention embeds integrate motor;

Fig. 3 is the axis plane projection geometry of embodiment of the present invention integrated electric pump water spray power model;

Fig. 4 is air gap axial plane perspective geometry enlarged drawing in the spray of embodiment of the present invention integrated electric pump;

Fig. 5 is the 3 dimensional coil geometry of the embodiment of the present invention shaftless drive-type integrated electric pump water spray power model;

Fig. 6 is that the embodiment of the present invention shaftless drive-type integrated electric pump water spray power model indulges velocity distribution plan in secondary section under design speed and design speed.

Embodiment

With reference now to accompanying drawing, describe embodiments of the invention, element numbers similar in accompanying drawing represents similar element.

Step S1, carries out the Selection and Design of pump fluid passage hydraulic parameters according to designing requirement

Five the Hydraulic Design parameters of the pump fluid passage formed according to stator before rotor and rearmounted impeller in the speed of a ship or plane and the spray of power designs index determination pump.

Obtain useful power by the product of hull resistance and design speed, then by main frame rated power, rated speed, reduction gear ratio, according to hydraulic jet propulsion basic theories, the lift H of pump fluid passage, flow Q, discharge area A can be drawn _j, specific speed N _swith suction inlet specific speed Parameter N _ss, this process is called the Selection and Design of pump fluid passage hydraulic parameters.Particularly, the expression formula that expression formula (1) is lift H, the expression formula that expression formula (2) is flow Q,

$H=[{\mathrm{\μ}}^2(1+\mathrm{\ψ})-\mathrm{\β}]\frac{V_0^2}{2g}---\left(1\right)$

$Q=\frac{P_D{\mathrm{\η}}_m{\mathrm{\η}}_P{\mathrm{\η}}_r}{\mathrm{\ρgH}}---\left(2\right)$

Wherein, ψ is leaving energy loss coefficient, gets 0.01 during analysis; β is the kinetic energy influence coefficient that hull boundary layer flow sprays pump, is assumed to 0.87 during analysis; V ₀it is design speed; μ sprays ratio, and it equals velocity of discharge V _jwith speed of a ship or plane V ₀ratio, by the highest decision of ejection efficiency; η _mbe axle system transmission efficiency, during analysis, get 0.98; η _pbe pump efficiency, during type selecting, get 0.91; η _rbe pump relative rotative efficiency, during analysis, get 0.99; P _dbeing the main frame output power corresponding with useful power, is known quantity; ρ is the density of water; G is acceleration of gravity.

Discharge area A _jexpression formula is,

$A_j=\frac{Q}{V_j}---\left(3\right)$

Can obtain outlet diameter is thus,

$D_j=\sqrt{\frac{4A_j}{\mathrm{\π}}+D_h^2}---\left(4\right)$

Wherein, D _hfor outlet hub diameter, equal the product of outlet diameter and hub diameter ratio, hub diameter ratio is according to specific speed and design experiences value.

The specific speed N of pump fluid passage _sexpression formula is,

$N_S=\frac{2\mathrm{\πn}\sqrt{Q}}{{\left(\mathrm{gH}\right)}^{3/4}}---\left(5\right)$

Be a characteristic, wherein, n (r/s) is rearmounted wheel speed and rotor rotating speed; The unit of volume flow Q is m ³the unit of/s, lift H is m.According to the design experiences of pump fluid passage, 1.46 < N _sduring < 3.66, channels designs is mixed-flow, N _sduring > 3.66, channels designs is axial-flow type.

The suction inlet specific speed N of pump fluid passage _ssexpression formula is,

$N_{\mathrm{SS}}=\frac{N\sqrt{Q}}{\mathrm{NPS}{H}^{3/4}}---\left(6\right)$

Wherein, the clean positive suction nozzle of the unit of rotating speed N to be r/min, NPSH be pump fluid passage, be meant to fluid channel inlet avoid cavitation produce required for pressure,

$\mathrm{NPSH}=\frac{p_a-\mathrm{pv}}{\mathrm{\&rho;g}}-\mathrm{\&psi;}\frac{V_0^2}{2g}+\mathrm{\&beta;}\frac{V_0^2}{2g}---\left(7\right)$

Wherein, P _aatmospheric pressure, P _vbe pressure for vaporization, be all taken as constant.During cavitation inception, the corresponding specific critical value of suction inlet specific speed, directly reflects the anti-cavitation performance of fluid passage.

Step S2, determines that the primary pump before the two-dimentional axis plane projection geometry of wall obtains embedding motor inside and outside stator before rotor, rearmounted impeller and conduit sprays two-dimentional axis plane projection geometry.

Figure 2 shows that integrated electric pump of the present invention spray embeds integrate motor rotor and the revolved projection of air gap in the past on axial plane, comprise section 8, pipe inner wall face back segment 9, conduit outer wall face 11 in face of stator before rotor wheel hub 1, stator before rotor blade 2, stator before rotor wheel rim 3, rearmounted impeller hub 4, rearmounted impeller blade 5, rearmounted wheel rim 6, outlet wheel hub wall 7, pipe inner wall.Shrinkage type pipe inner wall face back segment 9 smoothly transits with rearmounted wheel rim 6 curvature and is connected, and in face of shrinkage type pipe inner wall, section 8 smoothly transits with stator before rotor wheel rim 3 curvature and is connected.In stator before rotor blade axis plane projection, in guide margin 12 and lagging edge 13, rearmounted impeller blade axis plane projection, guide margin 14 and lagging edge 15 are straight-line segment, also can be SPL.Distance in rearmounted impeller blade axis plane projection between guide margin and lagging edge blade tip end points is less than motor ring-shaped rotor axial length.Conduit outer wall face 11 leading portion is straight-line segment, back segment is gradual shrinkage SPL, is connected with pipe inner wall face outlet guide circle.Rearmounted wheel rim diameter equals integrate motor rotor internal diameter, the diameter of conduit outer wall face straight-line segment is greater than motor preposition stator outer diameter, motor preposition stator outer diameter equal rotor internal diameter, 2 times of rotor radial thicknesss, air gap, 2 times of motor preposition stator radial thicknesss four and.The annulus area that the import of pipe inner wall face is formed equals 1.6 times of conduit outlet annulus area.

Step S3, the 3 dimensional coil geometry of parametrization ternary Reverse Design determination stator before rotor, rearmounted impeller is adopted according to step S1 and step S2 acquired results, rotated vertically by the two-dimentional axis plane projection geometry of conduit and obtain conduit 3 dimensional coil geometry, the 3 dimensional coil geometry combination of described stator before rotor, rearmounted impeller and conduit obtains the initial pump-jet propulsor hydraulic model before embedding motor.

According to five the Hydraulic Design parameters of the pump fluid passage of step S1 setting, the axis plane projection geometry of the stator before rotor that integrating step S2 is given and rearmounted impeller, adopts the design of parametrization ternary Reverse Design to draw stator before rotor and rearmounted impeller blade 3 dimensional coil geometry.The core concept of this method for designing is: blade 3 dimensional coil geometry is determined jointly by hydrodynamic parameter (blade load distributes and outlet circulation distributes) and geometric parameter (axial plane geometry, leaf section thickness distribute and stacking angle).Stator before rotor blade lagging edge adopts increment type swirl distribution, rearmounted impeller blade guide margin to adopt quadratic power swirl distribution; Carry type load distribution during the blade root cross section of stator before rotor and rearmounted impeller blade all adopts, blade tip cross section carries type load distribution before all adopting; Guide margin place, stator before rotor blade root cross section adopts little positive incidence, and lagging edge place, rearmounted impeller blade blade tip cross section adopts little negative angle of attack.Blade load distribution determines the distribution of leaf sectional pressure coefficient along chord length direction, and then directly determines its capacity for work and anti-cavitation performance; Outlet circulation distribution for controlling the secondary flow of rearmounted impeller blade in the capacity for work and stator before rotor blade in span direction, and then improves the interaction flow field between stator before rotor and rearmounted impeller, improves work doing efficiency.Stator before rotor blade exit circular rector is equal with rearmounted impeller blade import circular rector.Blade face load (pressure differential between blade face pressure face and suction surface) and circumferentially average circular rector rV _tderivative on meridian streamline direction is closely related, and mathematical model is,

$p^{+}-p^{-}=\frac{2\mathrm{\&pi;}}{B}\mathrm{\&rho;}{V}_m\frac{\&PartialD;\left(r{V}_t\right)}{\&PartialD;m}---\left(8\right)$

Wherein, V _mbe circumferentially average axis plane velocity, equal the ratio of the flow area corresponding with diameter in axis projection; V _tbe circumferentially average tangential speed component, equal circular rector rV _tbe worth the ratio with radius in axis projection, circular rector rV _tbe worth and determined by lift and revolution speed, η _hfor hydraulic efficiency, during design, initial value is taken as 0.92; p ⁺, p ^-be the static pressure of blade pressure surface and suction surface respectively, both differences equal blade and produce thrust; B is the number of blade, empirically given, and stator before rotor and rearmounted impeller blade number meet relatively prime relation usually, as stator before rotor blade 13 leaf, rearmounted impeller blade 9 leaf; M is dimensionless meridian streamline length, and being blade different span places geometric parameters, is 0 to 1 from vane inlet to outlet value.First this method for designing is proposed in 1991 by Mehrdad doctor Zangeneh of University College London.

After obtaining stator before rotor and rearmounted impeller 3 dimensional coil geometry, conduit outer wall face, internal face leading portion, internal face back segment axis plane projection outline line are rotated in a circumferential direction and obtain conduit 3 dimensional coil geometry, after stator before rotor, rearmounted impeller and catheter combination, obtains the pump spray hydraulic model before embedding integrate motor.

Step S4, adopts viscosity CFD computing method, and stable state solves the open-water performance of the initial pump-jet propulsor hydraulic model before embedding integrate motor.CFD calculate time, comprise pump jet flow field control domain grid discrete, setting physical boundary conditions, flow field control equation solution, Flow Field Calculation result visualization aftertreatment four steps.When grid is discrete, stator before rotor, rearmounted impeller and conduit outlet interior flow field and conduit External airflow field preferentially adopt full hexahedron structure grid, can effectively ensure Flow Field Calculation precision under the condition meeting the requirement of grid independence.Physical boundary conditions is taken as speed import and pressure export, and rearmounted wheel speed is rated speed.During flow field control equation solution, general CFD solver can be selected, comprise CFX, FLUENT, STARccm+ etc., preferential employing CFX Special rotary machinery solver.When governing equation solves, fluid turbulence model selects two equation shear stress transport SST models.During the aftertreatment of Flow Field Calculation result visualization, extract pump fluid passage lift, power and hydraulic efficiency, extract again after pump spray pushes away force and moment and ask for spacious water efficiency, judge whether power efficiency meets design requirement, if, then enter step S5, if not, then get back to the axis plane projection geometry that step S2 adjusts stator before rotor and rearmounted impeller in pump fluid passage.

Step S5, the two-dimentional axis plane projection geometry increasing motor ring-shaped rotor and air gap is sprayed in two-dimentional axis plane projection geometry in the pump of step S2 gained, 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 the 3 dimensional coil geometry of motor ring-shaped rotor and air gap, the conduit 3 dimensional coil geometry of step S3 gained and air gap outer face boolean are subtracted each other and obtains the conduit 3 dimensional coil geometry after embedding integrate motor, by the 3 dimensional coil geometry of the stator before rotor of step S3 gained and rearmounted impeller with embed integrate motor after conduit 3 dimensional coil geometry combine and obtain integrated electric pump and to spray water power model.

Figure 3 shows that embed the pump before integrate motor spray add motor ring-shaped rotor and air gap in two-dimentional axis plane projection geometry after the band air gap integrated electric pump that obtains spray two-dimentional axis plane projection geometry.Figure 4 shows that air gap axial plane perspective geometry partial enlarged drawing.Rotor internal diameter D _rithe propeller power sent by motor determines, solving expression formula is,

P _T＝2k _T[α _sr(D _ri+2h _pole+l _g)] ²α _sal _aπn (9)

Wherein, k _tfor motor torque constant coefficient, h _polefor magnetic pole thickness, l _afor the axial length of rotor, α _srand α _sabe respectively the radial and axial zoom factor of motor, determine by design of electrical motor experience.L _gfor size of gaps, axially equal with radial direction, according to motor radiating amount and electrical machine insulation design level value.Ring-shaped rotor outside wall surface 19 and air gap outer face 18 axis plane projection profile are rotated in a circumferential direction and obtains the 3 dimensional coil geometry of motor ring-shaped rotor and air gap.Obtain embedding the conduit geometry of integrate motor after former conduit 3 dimensional coil geometry and air gap outside wall surface boolean subtract each other, after combining with stator before rotor, rearmounted impeller and rotor, obtain being with air gap integrated electric pump to spray water the 3 dimensional coil geometry of power model.The diameter of air gap outer face horizontal segment equals motor preposition diameter of stator bore.Figure 1 shows that shaftless drive-type integrated electric pump water spray power modelling processes of research & development of the present invention.Figure 5 shows that an embodiment of shaftless drive-type integrated electric pump water spray power model of the present invention, comprise stator before rotor 2, rearmounted impeller 5, motor ring-shaped rotor 16, air gap 17 and conduit 10.

Step S6, adopts viscosity CFD computing method, and stable state solves the open-water performance of the integrated electric pump water spray power model of band air gap.Solution procedure is identical with step S4.During the aftertreatment of Flow Field Calculation result visualization, extract pump fluid passage lift, power and hydraulic efficiency, extract again after pump spray pushes away force and moment and ask for spacious water efficiency (propulsive efficiency), under judging design speed and rotating speed, whether power, hydraulic efficiency and pump spray propulsive efficiency meets design objective requirement, if, then enter step S7, if not, then get back to the load parameter in step S3 adjustment pump spray stator before rotor and rearmounted impeller blade ternary parametrization reverse engineer process;

Step S7, solves the cavitating flow of band air gap integrated electric pump water spray power model.The integrated electric pump water spray power MODEL C FD computational flow result meeting power efficiency designing requirement obtained with step S6, for initial value, is introduced cavitation model, is solved the cavitating flow of integrated electric pump water spray power model.When having solved cavitation polyphasic flow turbulent flow, turbulence model has still adopted SST two-equation model, and cavitation model adopts the modified Sauer cavitation model as formula (1):

Wherein, with represent water vapour evaporation (air bubble growth) and condensation (bubble is crumbled and fall) process respectively, evaporation and condensation coefficient get C respectively _prod=50 and C _dest=0.01, the average initial radium R of bubble _b=1.5 μm, α _vand ρ _vrepresent water vapour volume fraction and density respectively, ρ _lrepresent the density of water, p represents hydrodynamic pressure, p _vrepresent phase transformation emergent pressure, during calculating, value is as formula (11):

$p_v=p_{\mathrm{sat}}+\frac{1}{2}\left(0.39{\mathrm{\&rho;}}_{m}k\right)---\left(11\right)$

Wherein, p _satrepresent pressure for vaporization constant, k represents Hydrodynamic turbulence energy, ρ _mrepresent fluid-mixing density, during calculating, value is as formula (12):

ρ _m＝(α _vρ _v+(1-α _v-α _g)ρl)/(1-f _g) (12)，

Wherein, α _gand f _grepresent volume fraction and the massfraction of not concretive gas core NCG respectively, value is α _g=7.8 × 10 ^-4and f _g=1.0 × 10 ^-6.For the three-phase fluid-mixing be made up of water, water vapour and NCG, volume fraction and the massfraction of each phase all meet relational expression $\mathrm{fi}=\mathrm{\&alpha;i}\frac{\mathrm{\&rho;i}}{\mathrm{\&rho;m}}(i=\mathrm{1,2,3}).$

In addition, solve the spray of integrated electric pump have a cavitation polyphasic flow turbulent flow time, cavitation model can also adopt the Zwart model as formula (13)

$\stackrel{.}{m}=\left\{\begin{array}{ccc}-F_e\frac{3r_{\mathrm{nuc}}(1-\mathrm{\&alpha;}){\mathrm{\&rho;}}_v}{R_B}\sqrt{\frac{2}{3}\frac{p_v-p}{\mathrm{\&rho;l}}},& \mathrm{if}& p<p_v\\ F_c\frac{3\mathrm{\&alpha;}{\mathrm{\&rho;}}_v}{R_B}\sqrt{\frac{2}{3}\frac{p-p_v}{\mathrm{\&rho;l}}},& \mathrm{if}& p>p_v\end{array}\right.---\left(13\right)$

Wherein, r _nucfor gas Assessment of Nuclear Volume mark, R _bfor gas nuclear radius, parameter value is r _nuc=5.0 × 10 ^-4, R _b=2.0 × 10 ^-6, F _e=50, F _c=0.01.Hybrid density ρ=ρ=α _vρ _v+ (1-α _v) ρ _l.

What solve the spray of integrated electric pump has the Sauer model that can also to adopt during cavitation polyphasic flow turbulent flow as formula (14):

$\stackrel{.}{m}=-{\mathrm{\&rho;}}_v(1-\mathrm{\&alpha;})\frac{3\mathrm{\&alpha;}}{R_b}\mathrm{sign}(p-p_v)\sqrt{\frac{2}{3}\frac{|p-p_v|}{\mathrm{\&rho;l}}}---\left(14\right)$

Wherein, $\mathrm{\&alpha;}=\frac{\frac{4}{3}\mathrm{\&pi;}{R}_b^3{n}_0}{1+\frac{4}{3}\mathrm{\&pi;}{R}_b^3{n}_0},$ $R_b={\left(\frac{1}{\frac{4}{3}\mathrm{\&pi;}{n}_0}\frac{\mathrm{\&alpha;}}{1-\mathrm{\&alpha;}}\right)}^{1/3},$ N ₀for constant.

After integrated electric pump spray cavitating flow calculates convergence, extract blade surface in result of calculation and the total cavitation area of air gap wall, judge whether the ratio of cavitation area and pump inlet area is greater than 1%, if not, then enter step S8, if so, then get back to the load distribution rule that step S3 adjusts ternary reverse engineer process Leaf surface, suppress cavitation to produce.

Fig. 6 is the vertical secondary section velocity distribution plan that integrated electric pump of the present invention water spray power model embodiment saves at design speed 16 and calculated by viscosity CFD under design speed, the inside and outside flowing of conduit all produces without obvious separation flow and secondary flow as seen from Figure 6, in 0.35 times of above interval of radius, rearmounted impeller blade wake flow has very little circumferential speed component, shows that the matching design of stator before rotor and rearmounted impeller is preferably.Table 1 is the integration power performance of band air gap integrated electric pump of the present invention water spray power model embodiment under design speed 16 joint and design speed.The spacious water efficiency 0.589 of pump spray, a little more than the spacious water efficiency when the first seven leaf oar working point.

Table 1 integrated electric pump water spray power model (13 leaf stator before rotors, the rearmounted impeller of 9 leaf) embodiment performance parameter

Step S8, solves and meets power, the pulsation thrust of band air gap integrated electric pump water spray power model of efficiency and cavitation performance requirement and side force.Pump spray axially loaded equals thrust, and side force is the synthesis of transverse force and radial force.With step S6 integrated electric pump spray stable state result of calculation for initial value, unsteady flo w transient simulation method is adopted to solve pump spray pulsation thrust and side force.Yardstick can be adopted when solving to adapt to simulation (SAS), separated vorticcs simulation (DES) or Large eddy simulation method (LES), preferential employing SAS simulates, and effectively can shorten computation period under the condition ensureing pulsating force amplitude forecast precision.The governing equation of SAS-SST model is by increasing source item Q in the transport equation of turbulence vortex frequencies omega _sASrealize.

$Q_{\mathrm{SAS}}=\max [\mathrm{\&rho;\&zeta;k}{S}^2{\left(\frac{L}{L_{\mathrm{vK}}}\right)}^2-C\&CenterDot;\frac{2\mathrm{\&rho;k}}{\mathrm{\&sigma;}}\max (\frac{1}{{\mathrm{\&omega;}}^2}\&dtri;\mathrm{\&omega;}\&CenterDot;\&dtri;\mathrm{\&omega;},\frac{1}{k^2}\&dtri;k\&CenterDot;\&dtri;k),0]---\left(15\right)$

Wherein, ζ=3.51, σ=2/3, C=2, κ=0.41.L is turbulent flow length dimension, L _vKfor Feng Kamen length dimension, S is strain.

In addition, solve having during the heterogeneous turbulent flow of cavitation of integrated electric pump spray the DES as formula (16) can also be adopted simulate carrying out transient state, during DES-SST simulation, the mixed function of SST model is done correction further,

$F_{\mathrm{DES}}=\max (\frac{L}{0.61\mathrm{\&Delta;}}(1-F_2),1)---\left(16\right)$

Wherein, β '=0.09, μ is fluid viscosity, and Δ y is grid node wall distance.The essential distinction that separated vorticcs analog D ES and yardstick adapt to simulate SAS is to be converted to when LES solves stronger to the dependence of local mesh scale, belongs to rigid conversion,

And transfer process is realized by mixed function.

In addition, the large eddy simulation LES method that can also to adopt during the heterogeneous turbulent flow of cavitation as formula (17) is had what carry out that transient state solves the spray of integrated electric pump

$\frac{\&PartialD;{\stackrel{-}{U}}_i}{\&PartialD;t}+\frac{\&PartialD;\left({\stackrel{-}{U}}_i{\stackrel{-}{U}}_j\right)}{\&PartialD;x_j}=\frac{\&PartialD;}{\&PartialD;x_j}\left[v(\frac{\&PartialD;{\stackrel{-}{U}}_i}{\&PartialD;x_j}+\frac{\&PartialD;{\stackrel{-}{U}}_j}{\&PartialD;x_i})\right]-\frac{1}{\mathrm{\&rho;}}\frac{\&PartialD;\stackrel{-}{p}}{\&PartialD;x_i}-\frac{\&PartialD;{\mathrm{\&tau;}}_{\mathrm{ij}}}{\&PartialD;x_j}---\left(17\right)$

Wherein, τ _ijfor sub-grid scale model.

Step S9, solves the discrete lines spectral noise sound source level of integrated electric pump water spray power model.Pulsating force source far-field radiation acoustic pressure expression formula is

$p(r,t)=\frac{\stackrel{.}{F}\&CenterDot;r}{4\mathrm{\&pi;rc}}=\frac{\stackrel{.}{F}(t\&prime;)}{4\mathrm{\&pi;rc}}\cos \mathrm{\&theta;}---\left(18\right)$

Wherein, t' is lag time, and F is pulsating force vector, and r is point position vector, r be pulsating force source to measuring point distance, c is the velocity of sound, and θ is angle between F and r vector, and cos θ item is for characterizing the dipole sound field directive property in pulsating force source.Experience shows, even if pulsating force source error reaches 30%, the sound radiation pressure spectrum level error of being tried to achieve by formula (18) is also only 3.1 dB, meets requirement of engineering precision.When measuring distance converts 1m, the sound radiation pressure spectrum level of being tried to achieve by formula (18) is discrete line spectrum sound source level.After asking for the discrete line spectrum sound source level of integrated electric pump water spray power model, judge whether radiated noise meets design objective requirement, if, then enter step 10), if not, coming back to step S3 increases the rear side oblique angle of rearmounted impeller blade and the oblique angle, front side of stator before rotor blade, obtains integrate motor large skew back pump spray three-dimensional geometry, repeat step S3 ~ S9 process again, until efficiency, cavitation and noise objective are required to meet.

Step S10, carries out strength check to the band air gap integrated electric pump water spray power model meeting power, efficiency, cavitation and noise perfomiance requirements.Adopt finite element FEM method during Strength co-mputation, solver can select ripe common finite element solver, as ANSYS or NASTRAN.Strength check comprises static strength and fatigue resistance.When static strength calculates, the hydrodynamic load of blade surface is calculated by stable state, and when fatigue resistance calculates, the hydrodynamic load of blade surface is calculated by transient state.After given blade material property parameters, comprise Materials Yield Limit, Poisson ratio, Young modulus and density, calculate the blade maximum stress under hydrodynamic load, gravity load and centrifugal force load acting in conjunction and maximum resultant displacement (strain) value, judge whether stress and strain meets the index request of national military standard to intensity.If so, then enter step S11, if not, then getting back to step S3 increases leaf section thickness, re-starts power, efficiency, cavitation, noise and strength check.

Step S11, after efficiency, cavitation, noise and intensity all meet design objective requirement, determines shaftless drive-type integrated electric pump water spray power model, and provides the vane thickness distribution recommendation met under given material properties parameter.

Integrated electric pump water spray power model optimization is applicable to underwater submarine and unmanned deep sea vehicle advances, and the blade parameter ternary reverse engineer experience adopted in described step S3 is equally applicable to routine has axle drive-type stator before rotor pump to spray and torpedo propelling integrate motor rearmounted stator pumps spray design.

The present embodiment in practice successful design one type power 3.713MW, hydraulic efficiency 85.62%, propulsive efficiency 58.92%, non-cavitating produce, the integrated electric pump water spray power model of line spectrum noise 123dB.

The present invention have employed parametrization ternary Reverse Design design stator before rotor and rearmounted impeller blade 3 dimensional coil geometry in the design process, sprayed propulsive efficiency and cavitation performance by CFD calculation check pump, spray pulsation thrust and side force according to pump verifies pump and sprays noiseproof feature and calculated by FEM and check pump and spray intensity, can fast, Reliable Design goes out to meet low noise, the high critical speed of a ship or plane and the moderate integrated electric pump water spray power model of propulsive efficiency simultaneously, directly can be applied to shaftless Push Technology under water, have broad application prospects.

Claims (10)

1. a method for designing for shaftless drive-type integrate motor pump-jet propulsor hydraulic model, is characterized in that, comprise the steps:

Step 1, carries out the Selection and Design of pump fluid passage hydraulic parameters according to designing requirement;

Step 2, determines that the primary pump before the two-dimentional axis plane projection geometry of wall obtains embedding motor inside and outside stator before rotor, rearmounted impeller and conduit sprays two-dimentional axis plane projection geometry;

Step 3, the 3 dimensional coil geometry of parametrization ternary Reverse Design determination stator before rotor, rearmounted impeller is adopted according to step 1 and step 2 acquired results, rotated vertically by the two-dimentional axis plane projection geometry of conduit and obtain conduit 3 dimensional coil geometry, the 3 dimensional coil geometry combination of described stator before rotor, rearmounted impeller and conduit obtains the initial pump-jet propulsor hydraulic model before embedding motor;

Step 4, the two-dimentional axis plane projection geometry increasing motor ring-shaped rotor and air gap is sprayed in two-dimentional axis plane projection geometry in the pump of step 2 gained, 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 the 3 dimensional coil geometry of motor ring-shaped rotor and air gap, the conduit 3 dimensional coil geometry of step 3 gained and air gap outer face boolean are subtracted each other and obtains the conduit 3 dimensional coil geometry after embedding integrate motor, by the 3 dimensional coil geometry of the stator before rotor of step 3 gained and rearmounted impeller with embed integrate motor after conduit 3 dimensional coil geometry combine and obtain integrated electric pump and to spray water power model,

Step 5, Viscous calculation fluid mechanics CFD method is adopted to calculate the open-water performance of integrated electric pump water spray power model under design speed and rotating speed, judge whether consumed power, pump hydraulic efficiency and pump spray propulsive efficiency meets design objective requirement, if, then enter step 6, if not, then get back to step 3 and adjust pump spray stator before rotor and the blade surface load distribution rule of rearmounted impeller blade in ternary reverse engineer process, redesign stator before rotor and rearmounted impeller 3 dimensional coil geometry;

Step 6, solve the cavitating flow that consumed power, pump hydraulic efficiency and pump spray propulsive efficiency meets the integrated electric pump water spray power model of design objective requirement, judge whether the ratio that cavitation area and pump spray rearmounted impeller disk area is greater than 1%, if not, then enter step 7, if so, then get back to step 3 and adjust pump spray stator before rotor and the blade surface load distribution rule of rearmounted impeller blade in ternary reverse engineer process, suppress cavitation to produce;

Step 7, solution procedure 6 gained meets the unsteady flo w transient flow field of integrated electric pump water spray power model of consumed power, pump hydraulic efficiency, pump spray propulsive efficiency and cavitation performance requirement, extracts pump spray pulsation thrust and the result of calculation of side force in time domain and frequency domain;

Step 8, the sound source level of the discrete line spectrum radiated noise of solution procedure 7 gained integrated electric pump water spray power model pulsation thrust and side force induction, judge whether radiated noise sound source level meets design objective, if, then enter step 9, if not, then get back to step 3 and increase the rear side rake angle of rearmounted impeller blade and the front side rake angle of stator before rotor blade;

Step 9, adopt the intensity of Finite Element Method numerical evaluation step 8 gained integrated electric pump water spray power model, judge whether the pump spray intensity under given material properties parameter meets national military standard index request, if, then determine the integrated electric pump water spray power model meeting low noise, high critical speed of a ship or plane performance requirement, provide the vane thickness recommended value under recommendation material, if not, then get back in step 3 and increase vane thickness, and then redefine pump spray hydraulic model.

2. the method for designing of a kind of shaftless drive-type integrate motor pump-jet propulsor hydraulic model according to claim 1, is characterized in that: in described step 1, hydraulic parameters comprises the lift of pump fluid passage, flow, discharge area, specific speed and suction inlet specific speed 5 parameters.

3. the method for designing of a kind of shaftless drive-type integrate motor pump-jet propulsor hydraulic model according to claim 1, it is characterized in that: when determining in described step 2 that primary pump sprays two-dimentional axis plane projection geometry, stator before rotor and rearmounted impeller blade are greater than 10% at the spacing distance of axial direction and the ratio of impeller diameter; Impeller hub and wheel rim form axial-flow type cross-sectional passage; Stator before rotor wheel rim is identical with rearmounted wheel rim diameter, and stator before rotor wheel hub and rearmounted impeller hub curvature smoothly transit; In face of shrinkage type pipe inner wall, section and stator before rotor wheel rim curvature smoothly transit, and shrinkage type pipe inner wall face back segment and rearmounted wheel rim curvature smoothly transit.

4. the method for designing of a kind of shaftless drive-type integrate motor pump-jet propulsor hydraulic model according to claim 1, it is characterized in that: in described step 3, rearmounted impeller blade circumferentially rotates, to the opposite direction skew back rotated, and from blade root to blade tip cross section to stem trim; The stator before rotor number of blade is 11 leaves or 13 leaves, rearmounted impeller blade number preferably 9 leaves; Stator before rotor and rearmounted impeller blade adopt the distribution of NACA16 profile thickness; Hypertrophic conduit is zero thrust or low thrust conduit, and conduit radial thickness is greater than motor stator, rotor and air gap three radial thickness sum.

5. the method for designing of a kind of shaftless drive-type integrate motor pump-jet propulsor hydraulic model according to claim 1, it is characterized in that: when adopting parametrization ternary Reverse Design to design stator before rotor and rearmounted impeller blade geometry in described step 3, stator before rotor blade lagging edge adopts increment type swirl distribution, rearmounted impeller blade guide margin to adopt quadratic power swirl distribution; Carry type load distribution during the blade root cross section of stator before rotor and rearmounted impeller blade all adopts, blade tip cross section carries type load distribution before all adopting; Guide margin place, stator before rotor blade root cross section adopts little positive incidence, and lagging edge place, rearmounted impeller blade blade tip cross section adopts little negative angle of attack.

6. the method for designing of a kind of shaftless drive-type integrate motor pump-jet propulsor hydraulic model according to claim 1, it is characterized in that: after described step 3, also comprise the step that the initial pump-jet propulsor hydraulic model of gained is verified: adopt Viscous calculation fluid mechanics CFD method, calculate the open-water performance of initial pump-jet propulsor hydraulic model, judge consumed power, whether pump hydraulic efficiency and the spacious water efficiency of pump spray meet design objective requirement, if, then enter step 4, if not, then get back to step 2 and adjust pump spray stator before rotor, the axis plane projection geometry of rearmounted impeller and conduit.

7. the method for designing of a kind of shaftless drive-type integrate motor pump-jet propulsor hydraulic model according to claim 1, it is characterized in that: the axial length of described step 4 rotor and 2 times of size of gaps sums equal air gap axial length, rotor internal diameter and 2 times of rotor thickness and 2 times of size of gaps three sums equal air gap radical length.

8. the method for designing of a kind of shaftless drive-type integrate motor pump-jet propulsor hydraulic model according to claim 1, it is characterized in that: when solving band air gap integrated electric pump water spray power model cavitating flow in described step 6, adoptable cavitation model comprises Singhal model, Sauer model, Zwart model and improves Sauer cavitation model.

9. the method for designing of a kind of shaftless drive-type integrate motor pump-jet propulsor hydraulic model according to claim 1, it is characterized in that: when solving integrated electric pump water spray power model unsteady flo w transient flow field in described step 7, yardstick can be adopted to adapt to simulation SAS, separated vorticcs analog D ES or Large eddy simulation method LES, preferred SAS simulation.

10. the method for designing of a kind of shaftless drive-type integrate motor pump-jet propulsor hydraulic model according to claim 1, is characterized in that: the strength check in described step 9 comprises static strength and fatigue resistance.