CN109063363A - A kind of optimum design method of the hydraulic propeller based on database - Google Patents

A kind of optimum design method of the hydraulic propeller based on database Download PDF

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CN109063363A
CN109063363A CN201810945130.0A CN201810945130A CN109063363A CN 109063363 A CN109063363 A CN 109063363A CN 201810945130 A CN201810945130 A CN 201810945130A CN 109063363 A CN109063363 A CN 109063363A
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pump
database
design
model
hydraulic propeller
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王国玉
赵晓阳
张孟杰
黄彪
黄瀚锐
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Beijing Institute of Technology BIT
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    • G06—COMPUTING; CALCULATING OR COUNTING
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Abstract

A kind of optimum design method of hydraulic propeller based on database disclosed by the invention, is related to land and water vehicle, ship domain.Implementation method of the present invention is as follows: establishing the database of pump model；By design parameter front pump model database, and water jet propulsion pump is optimized；The optimization design for carrying out water inlet flow channel is combined with numerical simulation using agent model；Design spout；According to the water inlet flow channel of optimization design, the spout of the water jet propulsion pump of optimization design and design, the matching relationship of three is considered, the three-dimensional solid modeling of hydraulic propeller is carried out using three-dimensional drawing software；The hydraulic propeller of optimization design is applied to land and water vehicle, ship domain, the design efficiency of corresponding field hydraulic propeller is improved, shortens the design cycle, and solve the engineering problem in corresponding field.The present invention has the advantages that design efficiency is high, the design cycle is short, is conducive to practical application.

Description

A kind of optimum design method of the hydraulic propeller based on database
Technical field
The present invention relates to a kind of optimum design method of hydraulic propeller based on database, be related to land and water vehicle, Ship domain.
Background technique
Hydraulic propeller is a kind of device for pushing ship to advance using the reaction force for spraying water flow, with the relevant technologies Development, hydraulic propeller has been widely used in the fields such as amphibious vehicle and high-speed boat.Hydraulic propeller is compared to more traditional Propeller type propulsion device has many unique advantages.Hydraulic propeller does not need complicated transmission device, can be by engine reduced power It directly drives afterwards；Hydraulic propeller is typically mounted at hull interior, under complex work environment, is conducive to the protection of the pump housing；Spray Water propeller can effectively reduce the generation of vacuole, and reduce noise, reduce vibration；Hydraulic propeller has preferable manipulation Property and dynamic positioning performance, the variable speed of ship may be implemented, steering, fall to navigate；Hydraulic propeller power curve is flat, host Anti-overloading performance is preferable.
Meanwhile there is also some drawbacks for hydraulic propeller.Since hydraulic propeller is made of the pump housing and pipe-line system, pipeline The loss of system is serious, causes device whole efficiency lower than propeller；In order to adapt to the shallow water area of sandstone, generally spraying water Propeller water sucking mouth is provided with grid, can further increase the hydraulic loss of hydraulic propeller；Due to the leaf of hydraulic propeller Wheel is in inside, therefore repair demolition difficulty is greater than propeller.
As hydraulic propeller research is goed deep by various countries, the design theory of some relative maturities is formd.But in reality In, the amphibious vehicle design cycle is shorter, and higher to the power density requirements of water jet propulsion pump.Traditional design method is set The meter period is long, theoretical complicated, is unfavorable for needs of production.Therefore, propose that new design method has for hydraulic propeller Good application value.
Summary of the invention
For traditional design of waterjet method design cycle is long, design efficiency is lower, theoretical complexity, is unfavorable for reality The problems such as border is applied, a kind of optimum design method technology to be solved of the hydraulic propeller based on database disclosed by the invention Problem is: the optimization based on database realizing to hydraulic propeller, has that design efficiency is high, the design cycle is short, conducive to actually answering The advantages of using.
The purpose of the present invention is what is be achieved through the following technical solutions.
A kind of optimum design method of hydraulic propeller based on database disclosed by the invention, implementation method are as follows: building The database of vertical pump model.By design parameter front pump model database, and water jet propulsion pump is optimized.Using generation The method that reason model is combined with numerical simulation carries out the optimization design of water inlet flow channel, and optimization object is to influence water inlet flow channel transition Two key parameters, i.e. runner inclined angle alpha and elbow radius R3.Design spout.According to the water inlet flow channel of optimization design, optimization The water jet propulsion pump of design and the spout of design, consider the matching relationship of three, carry out hydraulic jet propulsion using three-dimensional drawing software The three-dimensional solid modeling of device.The hydraulic propeller of optimization design is applied to land and water vehicle, ship domain, improves corresponding neck The design efficiency of domain hydraulic propeller shortens the design cycle, and solves the engineering problem in corresponding field.
A kind of optimum design method of hydraulic propeller based on database disclosed by the invention, includes the following steps:
Step 1: the database of pump model is established.
Existing outstanding water jet propulsion pump model is chosen, according to pump-type and its characteristic parameter, by the corresponding leaf of each pump-type Piece is divided into multiple cross-sectional layers, respectively will be in the coordinate points input program of the single cross-sectional layers blade shape of correspondence using programming language And save, the coordinate points of single section blades shape are fitted, single section blades shaped graphic is generated.By the shape on all sections In shape graphic plotting to same figure, graphic file is formed, and save in the database.Database exports blade profile optimization design When as a result, the graphic file of corresponding pump-type is called directly.It is bent that corresponding overall characteristic is drawn according to the characteristic parameter of different pump-type Line, and combined characteristic is saved in the database.Also the model test result of different pump-type is saved in the database.It will Selected each outstanding water jet propulsion pump model, respectively in the manner described above carry out blade shape, combined characteristic and Extraction, drafting and the preservation of model-test data, the final database for establishing complete pump model.The database is functionally Mainly it is made of the model-test data of the blade geometric shape of each pump-type, the combined characteristic of each pump-type and each pump-type.
Preferably, by adding more outstanding model Pump datas, enhancing system into the database that step 1 is established The adaptability of system.
Step 2: by design parameter front pump model database, and water jet propulsion pump is optimized.
The specific implementation steps are as follows for step 2:
Step 2.1, previously given design parameter, and the interactive interface of front pump model database.The design parameter packet Include shaft power P, impeller arrowhead DLimit, cavitation specific speed C, route speed v0And spout central line is higher by the distance h of the water surfacec。
Step 2.2, read step one establish pump model database in each pump-type different operating points data, it is described The data of each operating point include revolving speed nm, impeller diameter Dm, lift Hm, flow QmWith torque Nm。
Step 2.3, by the Similar law pumped, the corresponding reality impeller of pump diameter D (i, j) of each operating point is calculated, and is sentenced It is disconnected whether to meet less than impeller arrowhead DLimit, wherein
Wherein: DmIndicate the impeller diameter of model pump in database, Pm(i) some axis of model pump in database is indicated Power, nm(j) some revolving speed of model pump in database, P are indicatedAxisIndicate the shaft power pumped in fact, n indicates the revolving speed pumped in fact, D (i, j) indicates impeller diameter of the real pump under a certain operating condition.
Array (i, j) indicates the parameter combination of previously given not shaft power source and revolving speed.
Step 2.4, for meeting D (i, j) < DLimitReal pump continue to calculate its corresponding according to pump Similar law Flow and lift, wherein
Wherein: Hm(i) indicate that model pump is meeting D (i, j) < DLimitWhen lift, H (i, j) indicate pump in fact at this time raises Journey.Qm(i) indicate that model pump is meeting D (i, j) < DLimitWhen flow, Q (i, j) indicates the flow that pumps in fact at this time.
Step 2.5, for meeting D (i, j) < DLimitReal pump, calculate its entrance loss:
hInto=h1+h2+h3+h4+h5 (4)
h1It is trash rack loss:
Wherein: ξ1For trash rack loss coefficient, vIntoIndicate inlet flow speed, Q indicates that flow, S indicate trash rack Area.
h2It is entrance local losses:
Wherein: ξ2For entrance local resistance loss coefficient.
h3It is water inlet pipe friction loss:
Wherein；ξ3For frictional resistant coefficient, vEquivalentFor water inlet pipe equivalent speed, SEquivalentFor water inlet pipe equivalent aera.
h4It is bend pipe loss:
Wherein: ξ4For bend pipe loss coefficient.
h5It is input end loss:
Wherein: ξ5For entrance loss coefficient.
Step 2.6, for meeting D (i, j) < DLimitReal pump, calculate its net positive suction head Δ hrWith remaining suction head HSV:
Wherein: C is cavitation specific speed, hcThe distance of the water surface, h are higher by for spout central lineIntoIndicate the entrance loss of pump, β For kinetic energy correction factor.
Step 2.7, it calculates and judges HSV-1.10ΔhrWhether > 0 is true, if so, then carry out spout discharge velocity vj Calculating.
Schilling vj=3v0, then the discharge loss h that pumpsjAre as follows:
Wherein, ξjFor the resistance to flow output coefficient of pump.
Then total losses hAlwaysAre as follows:
hAlways=hj+hInto (16)
After removing loss, remaining lift HIt is surplusAre as follows:
HIt is surplus=H-hAlways (17)
Then new muzzle velocity value vSpray is newAre as follows:
Calculate and judge whether speed restrains, that is, judge whether to meet | vSpray is new-vSpray| < ε, wherein ε is to meet preset threshold Infinitely small nonnegative real number, if meet | vSpray is new-vSpray| < ε, then iteration stopping, carries out step 2.8 and calculates, if being unsatisfactory for | vSpray is new-vSpray | < ε continues iteration, until convergence.
Step 2.8, the thrust equation calculation thrust F of hydraulic propeller is utilizedT, i.e.,
FT=ρ Q (vSpray is new-αv0) (19)
Wherein: α is influence coefficient of the boundary layer to flowing.
Step 2.9, the thrust magnitude that more all operating points are calculated filters out the maximum thrust under the conditions of the different speed of a ship or plane Value, and export corresponding flow Qm, lift HmWith thrust FT, that is, complete the optimization design to water jet propulsion pump.
Step 3: the optimization design of water inlet flow channel, optimization are carried out using the method that agent model is combined with numerical simulation Object is two key parameters for influencing water inlet flow channel transition, i.e. runner inclined angle alpha and elbow radius R3。
Step 3 specific implementation step is as follows:
Step 3.1, using CFD software, to runner inclined angle alpha and elbow radius R3Parametric modeling is carried out, is respectively set The different sample spaces of points.
Step 3.2, three-dimensional modeling is carried out to water inlet flow channel using 3 d modeling software, while increased below water inlet flow channel Control volume shaped like cuboid, and the entire computational domain including water inlet flow channel and control volume is drawn using grid dividing software Divide unstructured grid.
Step 3.3, boundary condition is given to computational domain, i.e., come stream interface, two sides and the bottom surface of control volume is set as speed Entrance；Hull bottom is represented above control volume, is set to Gu Bi, and control volume goes out stream interface and is set as pressure export；Water inlet flow channel tube wall And drive shaft is set as Gu Bi, water inlet flow channel outlet is set as pressure export.
Step 3.4, numerical value calculating is carried out to computational domain set by step 3.3 using CFD software, it is uniform with muzzle velocity Degree and pipeline efficiency two indices are judgment basis, define speed weighted average angle θ and runner efficiency eta thus, as symbolizing Two variables of mouth velocity uniformity and pipeline efficiency, and calculate separately:
Wherein
In formula, A is runner exit area of section, and Q is runner exit volume flow；uaiFor the X of i-th of outlet unit Speed on direction；utiFor the aggregate velocity on the direction XYZ of i-th of outlet unit；
In formula, E1And E2、u1And u2、P1And P2、x1And x2Respectively runner influent stream face, the total energy of exit face, speed, pressure, Apart from potential energy reference altitude；Q is volume theory；P0For environmental pressure.
Step 3.5, it is calculated by agent model about runner inclined angle alpha and elbow radius R3The boundary model of optimal solution It encloses and optimal solution set.
Step 3.6, sensitivity analysis is carried out using fitting result of the agent model to two variables, obtains runner inclination angle α and elbow radius R3To the influence size of tube outlet velocity uniformity and pipeline efficiency.
Step 3.7, final runner inclined angle alpha and elbow radius R are obtained3Optimal value, that is, realize use agent model The method combined with numerical simulation carries out the optimization design of water inlet flow channel.
Step 4: the design of spout.
According to the thrust equation F of hydraulic propellerT=ρ Q (vSpray is new-αv0), in speed of a ship or plane v0Under the premise of certain, in order to improve The thrust F of hydraulic propellerT, the discharge velocity v of hydraulic propeller should be increasedSpray is new, therefore, the spout of hydraulic propeller should Using reduction design, to increase discharge velocity.Meanwhile in order to guarantee that spout goes out the straight of stream, water jet propulsion pump is exported to spout Between changeover portion shape should meet the feature of lemniscate curve.
Step 5: the three-dimensional modeling of hydraulic propeller is realized using modeling software.
According to the design of the water inlet flow channel of step 3 optimization design, the water jet propulsion pump of step 2 optimization design and step 4 Spout considers the matching relationship of three, and the three-dimensional solid modeling of hydraulic propeller is carried out using three-dimensional drawing software.
Further include step 6: amphibious vehicle will be applied to according to the hydraulic propeller of step 1 to step 5 optimization design , ship domain, improve the design efficiency of corresponding field hydraulic propeller, shorten the design cycle, and solve the work in corresponding field Cheng Wenti.
The utility model has the advantages that
1, the optimum design method of a kind of hydraulic propeller based on database of the invention, by establishing water jet propulsion pump The database of model makes full use of the hydraulic model of water jet propulsion pump outstanding in existing database, is meeting design objective Under the premise of, efficient design goes out satisfactory propulsion pump model.
2, the optimum design method of a kind of hydraulic propeller based on database of the invention, by the number for establishing pump model According to library, the optimization design of water jet propulsion pump is carried out based on database, the method combined using agent model and numerical simulation into The optimization design of traveling water flow passage, designs spout on this basis, considers the matching relationship of three, using three-dimensional drawing software into The three-dimensional solid modeling of row hydraulic propeller can evade artificial screening to realize the Automatic Optimal Design of water jet propulsion pump Poor efficiency and design experiences are depended on unduly；
3, the optimum design method of a kind of hydraulic propeller based on database of the invention, using agent model and numerical value Simulation combines the optimization design for carrying out water inlet flow channel, and optimization object is two key parameters for influencing water inlet flow channel transition, i.e., Runner inclined angle alpha and elbow radius R3, sensitivity analysis is carried out using fitting result of the agent model to two variables, is flowed Road inclined angle alpha and elbow radius R3To the influence size of tube outlet velocity uniformity and pipeline efficiency, and then finally flowed Road inclined angle alpha and elbow radius R3Optimal value, that is, realize and carry out feed water flow combined with numerical simulation using agent model The optimization design in road advantageously reduces the loss of inlet pipeline, promotes the whole efficiency of hydraulic propeller.
4, the optimum design method of a kind of hydraulic propeller based on database of the invention, by being established to step 1 Database in the more outstanding model Pump datas of addition, the adaptability of system can be enhanced, meet diversified design requirement.
Detailed description of the invention
Fig. 1 is a kind of flow chart of the optimum design method of hydraulic propeller based on database of the invention；
Fig. 2 is water inlet pipe grid dividing schematic diagram of the present invention；
Fig. 3 is inlet pipeline numerical value calculation of boundary conditions schematic diagram of the present invention；
Fig. 4 is the schematic shapes of spout of the present invention；
Fig. 5 is the three-dimensional modeling of hydraulic propeller of the present invention.
Specific embodiment
With reference to the accompanying drawing, detailed description of the preferred embodiments.
Embodiment 1
As shown in Figure 1, a kind of design method of the hydraulic propeller based on database disclosed in the present embodiment, specific implementation Steps are as follows:
Step 1: the foundation of model database is pumped.
Using VB programming language, according to pump-type and its characteristic parameter, the corresponding blade of each pump-type is divided into multiple sections The coordinate points of the single cross-sectional layers blade shape of correspondence are inputted in program and are saved respectively, are fitted using SolidWorks by surface layer The coordinate points of single section blades shape, generate single section blades shaped graphic.Shaped graphic on all sections is drawn To in same figure, graphic file is formed, and save in the database.It is drawn according to the characteristic parameter of different pump-type corresponding Combined characteristic, and combined characteristic is saved in the database.Also the model test result of different pump-type is stored in In database.By selected each outstanding water jet propulsion pump model, blade shape, synthesis are carried out in the manner described above respectively Extraction, drafting and the preservation of characteristic curve and model-test data, the final database for establishing complete pump model.
Step 2: by design parameter front pump model database, and water jet propulsion pump is optimized.
The revolving speed of initial setting hydraulic propeller impeller is 1450r/min, shaft power 35kW, and impeller maximum gauge is 300mm, cavitation specific speed 1450, the central axis height of water sucking mouth to pump are 0.47m, route speed 9.72m/s.
In model pump database designed by above-mentioned data input step one, model pump database root is set according to input Parameter is counted, calculating is optimized according to step 2.1 to step 2.9, satisfactory water is finally filtered out in Pump data library Power model.The flow of finally obtained model pump is 0.37L/s, lift 8.2m, shaft power 36kW, revolving speed 1450r/ Min, net positive suction head 5.03, diameter 300mm, efficiency 80%, maximum thrust 7118N.
Step 3: the optimization design of water inlet flow channel.
(1) using the workbench platform in ANSYS, parametric modeling research is carried out to above-mentioned two parameter, and respectively The sample space of points is set；
(2) three-dimensional modeling is carried out to water inlet flow channel using Solidworks, while increased below water inlet flow channel shaped like length The control volume of cube needs suitably to increase control below water jet propulsion pump in order to enable calculated result is more in line with actual conditions The range of body, set in the present embodiment control volume length, width and height be respectively 20 times of water jet propulsion pump inlet diameter, 10 times and 8 times.Water inlet flow channel entity after three-dimensional modeling is imported into the Mesh module in ANSYS with iges format, to including Entire computational domain including water inlet flow channel and control volume divides unstructured grid, as shown in Fig. 2, to the corner of water inlet flow channel The violent position of equal variations carries out local cypher, it is contemplated that influence of the boundary layer to flowing is arranged 10 layers of boundary layer, and guarantees side Thickness of boundary layer is less than body fitted anisotropic mesh thickness.Finally, total grid number of computational domain reaches 1,800,000 or so；
(3) boundary condition is given to computational domain, as shown in figure 3, being set as come stream interface, two sides and the bottom surface of control volume Speed entrance；Hull bottom is represented above control volume, is set to Gu Bi, and control volume goes out stream interface and is set as pressure export；Water inlet flow channel Tube wall and drive shaft are set as Gu Bi, and water inlet flow channel outlet is set as pressure export；
(4) file for finishing grid dividing is imported into ANSYS in CFX module, completes pre-treatment parameter setting, selection SST model may finally obtain different runner inclined angle alphas and elbow radius R as turbulence model3Combine lower speed weighted average The numerical result of angle θ and runner efficiency eta are carried out sensitive using fitting result of the weighted average agent model to two variables Degree analysis, obtains runner inclined angle alpha and elbow radius R3To the influence size of tube outlet velocity uniformity and pipeline efficiency, and Obtaining optimal inclined angle alpha is 28 ° and elbow radius R3For 673mm.
Step 4: the design of spout.
According to the thrust equation F of hydraulic propellerT=ρ Q (vSpray is new-αv0), under the premise of ship's speed is certain, in order to improve spray The thrust of water propeller should increase the discharge velocity v of hydraulic propellerSpray is new, therefore, the spout of hydraulic propeller should use Reduction design, to increase discharge velocity.Meanwhile in order to guarantee that spout goes out the straight of stream, water jet propulsion pump is exported between spout Changeover portion shape should meet lemniscate curve equation, i.e. (x2+y2)2=a2(x2-y2), as shown in Figure 4.
Step 5: the three-dimensional modeling of hydraulic propeller.
Three is considered according to the design result of water inlet pipe, sparge pipe and spout using three-dimensional drawing software Solid works Matching relationship, carry out the three-dimensional solid modeling of hydraulic propeller, as shown in Figure 5.
The present embodiment applies a kind of optimum design method of hydraulic propeller based on database, to given design parameter Hydraulic propeller optimizes, and is calculated by the automatic Iterative of database, obtains the water jet propulsion pump for meeting design requirement Model, the design for inlet pipeline and spout provide standard, greatly save the design time of hydraulic propeller, simplify design stream Journey.On this basis, inlet pipeline is optimized using agent model method, reduces inlet pipeline hydraulic loss.By This shows that a kind of optimum design method of hydraulic propeller based on database has practical application value.
According to actual design experience, hydraulic propeller, work more abundant for experience are designed using traditional design method Journey technical staff, the time for generally requiring several weeks or even several months carry out complete design process, and design procedure is cumbersome, engineers and technicians The amount of labour it is larger.Hydraulic jet propulsion is carried out using a kind of optimum design method of hydraulic propeller based on database of the invention The design of device generally only needs time a couple of days that the optimization design of hydraulic propeller can be realized, greatly promotes design of waterjet Efficiency, reduce the amount of labour of engineers and technicians and the dependence to design experiences.
Finally, it should be noted that being merely illustrative of the technical solution of the present invention above, those skilled in the art It can be with modification or equivalent replacement of the technical solution of the present invention are made.It repairs all within the spirits and principles of the present invention Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.

Claims (5)

1. a kind of optimum design method of the hydraulic propeller based on database, it is characterised in that: include the following steps,
Step 1: the database of pump model is established；
Existing outstanding water jet propulsion pump model is chosen, according to pump-type and its characteristic parameter, the corresponding blade of each pump-type is drawn It is divided into multiple cross-sectional layers, the coordinate points of the single cross-sectional layers blade shape of correspondence is inputted in program and protected respectively using programming language It deposits, is fitted the coordinate points of single section blades shape, generate single section blades shaped graphic；By the shape graph on all sections Shape is plotted in same figure, forms graphic file, and save in the database；Database exports blade profile Optimum Design Results When, call directly the graphic file of corresponding pump-type；Corresponding combined characteristic is drawn according to the characteristic parameter of different pump-type, and Combined characteristic is saved in the database；Also the model test result of different pump-type is saved in the database；It will be selected The each outstanding water jet propulsion pump model taken carries out blade shape, combined characteristic and model in the manner described above respectively Extraction, drafting and the preservation of test data, the final database for establishing complete pump model；The database is functionally main It is made of the model-test data of the blade geometric shape of each pump-type, the combined characteristic of each pump-type and each pump-type；
Step 2: by design parameter front pump model database, and water jet propulsion pump is optimized；
Step 3: combining the optimization design for carrying out water inlet flow channel using agent model with numerical simulation, and optimization object is to influence Two key parameters of water inlet flow channel transition, i.e. runner inclined angle alpha and elbow radius R3；
Step 4: the design of spout；
According to the thrust equation F of hydraulic propellerT=ρ Q (vSpray is new-αv0), in speed of a ship or plane v0Under the premise of certain, in order to improve water spray The thrust F of propellerT, the discharge velocity v of hydraulic propeller should be increasedSpray is new, therefore, the spout of hydraulic propeller should use Reduction design, to increase discharge velocity；Meanwhile in order to guarantee that spout goes out the straight of stream, water jet propulsion pump is exported between spout Changeover portion shape should meet the feature of lemniscate curve；
Step 5: the three-dimensional modeling of hydraulic propeller is realized using modeling software；
The spray designed according to the water inlet flow channel of step 3 optimization design, the water jet propulsion pump of step 2 optimization design and step 4 Mouthful, consider the matching relationship of three, the three-dimensional solid modeling of hydraulic propeller is carried out using three-dimensional drawing software.
2. a kind of optimum design method of the hydraulic propeller based on database as described in claim 1, it is characterised in that: also Including step 6, land and water vehicle will be applied to according to the hydraulic propeller of step 1 to step 5 optimization design, ship is led It improves the design efficiency of corresponding field hydraulic propeller, shorten the design cycle, and solve the engineering problem in corresponding field in domain.
3. a kind of optimum design method of the hydraulic propeller based on database as claimed in claim 1 or 2, feature exist In: the specific implementation steps are as follows for step 2,
Step 2.1, previously given design parameter, and the interactive interface of front pump model database.The design parameter includes axis Power P, impeller arrowhead DLimit, cavitation specific speed C, route speed v0And spout central line is higher by the distance h of the water surfacec。
Step 2.2, for each pump-type in the data of different operating points, described is each in the pump model database that read step one is established The data of a operating point include revolving speed nm, impeller diameter Dm, lift Hm, flow QmWith torque Nm。
Step 2.3, by the Similar law pumped, the corresponding reality impeller of pump diameter D (i, j) of each operating point is calculated, and judgement is It is no to meet less than impeller arrowhead DLimit, wherein
Wherein: DmIndicate the impeller diameter of model pump in database, Pm(i) some shaft power of model pump in database is indicated, nm(j) some revolving speed of model pump in database, P are indicatedAxisIndicate the shaft power pumped in fact, n indicates the revolving speed pumped in fact, D (i, j) Indicate impeller diameter of the real pump under a certain operating condition.
Array (i, j) indicates the parameter combination of previously given not shaft power source and revolving speed.
Step 2.4, for meeting D (i, j) < DLimitReal pump continue to calculate its corresponding flow according to pump Similar law And lift, wherein
Wherein: Hm(i) indicate that model pump is meeting D (i, j) < DLimitWhen lift, H (i, j) indicates the lift that pumps in fact at this time.Qm (i) indicate that model pump is meeting D (i, j) < DLimitWhen flow, Q (i, j) indicates the flow that pumps in fact at this time.
Step 2.5, for meeting D (i, j) < DLimitReal pump, calculate its entrance loss:
hInto=h1+h2+h3+h4+h5 (4)
h1It is trash rack loss:
Wherein: ξ1For trash rack loss coefficient, vIntoIndicate inlet flow speed, Q indicates that flow, S indicate the face of trash rack Product.
h2It is entrance local losses:
Wherein: ξ2For entrance local resistance loss coefficient.
h3It is water inlet pipe friction loss:
Wherein；ξ3For frictional resistant coefficient, vEquivalentFor water inlet pipe equivalent speed, SEquivalentFor water inlet pipe equivalent aera.
h4It is bend pipe loss:
Wherein: ξ4For bend pipe loss coefficient.
h5It is input end loss:
Wherein: ξ5For entrance loss coefficient.
Step 2.6, for meeting D (i, j) < DLimitReal pump, calculate its net positive suction head Δ hrWith remaining suction head HSV:
Wherein: C is cavitation specific speed, hcThe distance of the water surface, h are higher by for spout central lineIntoIndicate the entrance loss of pump, β is kinetic energy Correction factor.
Step 2.7, it calculates and judges HSV-1.10ΔhrWhether > 0 is true, if so, then carry out spout discharge velocity vjMeter It calculates.
Schilling vj=3v0, then the discharge loss h that pumpsjAre as follows:
Wherein, ξjFor the resistance to flow output coefficient of pump.
Then total losses hAlwaysAre as follows:
hAlways=hj+hInto (16)
After removing loss, remaining lift HIt is surplusAre as follows:
HIt is surplus=H-hAlways (17)
Then new muzzle velocity value vSpray is newAre as follows:
Calculate and judge whether speed restrains, that is, judge whether to meet | vSpray is new-vSpray| < ε, wherein ε is the nothing for meeting preset threshold Small nonnegative real number is limited, if meeting | vSpray is new-vSpray| < ε, then iteration stopping, carries out step 2.8 and calculates, if being unsatisfactory for | vSpray is new-vSpray| < ε continues iteration, until convergence.
Step 2.8, the thrust equation calculation thrust F of hydraulic propeller is utilizedT, i.e.,
FT=ρ Q (vSpray is new-αv0) (19)
Wherein: α is influence coefficient of the boundary layer to flowing.
Step 2.9, the thrust magnitude that more all operating points are calculated filters out the maximum thrust value under the conditions of the different speed of a ship or plane, And export corresponding flow Qm, lift HmWith thrust FT, that is, complete the optimization design to water jet propulsion pump.
4. a kind of optimum design method of the hydraulic propeller based on database as claimed in claim 3, it is characterised in that: step Rapid three the specific implementation steps are as follows,
Step 3.1, using CFD software, to runner inclined angle alpha and elbow radius R3Parametric modeling is carried out, is respectively set different The sample space of points；
Step 3.2, using 3 d modeling software to water inlet flow channel carry out three-dimensional modeling, while below water inlet flow channel increase shaped like The control volume of cuboid, and it is non-to the entire computational domain division including water inlet flow channel and control volume using grid dividing software Structured grid；
Step 3.3, boundary condition is given to computational domain, i.e., come stream interface, two sides and the bottom surface of control volume is set as speed entrance； Hull bottom is represented above control volume, is set to Gu Bi, and control volume goes out stream interface and is set as pressure export；Water inlet flow channel tube wall and driving Axis is set as Gu Bi, and water inlet flow channel outlet is set as pressure export；
Step 3.4, numerical value calculating is carried out to computational domain set by step 3.3 using CFD software, with the muzzle velocity uniformity and Pipeline efficiency two indices are judgment basis, define speed weighted average angle θ and runner efficiency eta thus, as characterization outlet speed Two variables of the uniformity and pipeline efficiency are spent, and are calculated separately:
Wherein
In formula, A is runner exit area of section, and Q is runner exit volume flow；uaiFor the X-direction of i-th of outlet unit On speed；utiFor the aggregate velocity on the direction XYZ of i-th of outlet unit；
In formula, E1And E2、u1And u2、P1And P2、x1And x2Respectively runner influent stream face, the total energy of exit face, speed, pressure, distance Potential energy reference altitude；Q is volume theory；P0For environmental pressure；
Step 3.5, it is calculated by agent model about runner inclined angle alpha and elbow radius R3The bounds of optimal solution and Optimal solution set；
Step 3.6, carry out sensitivity analysis using fitting result of the agent model to two variables, obtain runner inclined angle alpha and Elbow radius R3To the influence size of tube outlet velocity uniformity and pipeline efficiency；
Step 3.7, final runner inclined angle alpha and elbow radius R are obtained3Optimal value, that is, realize use agent model and numerical value Simulate the optimization design that the method combined carries out water inlet flow channel.
5. a kind of optimum design method of the hydraulic propeller based on database as claimed in claim 4, it is characterised in that: logical It crosses and adds more outstanding model Pump datas into the database that step 1 is established, enhance the adaptability of system.
CN201810945130.0A 2018-08-20 2018-08-20 A kind of optimum design method of the hydraulic propeller based on database Pending CN109063363A (en)

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CN112836443B (en) * 2021-01-11 2022-06-03 中国人民解放军海军工程大学 Extremely-low-speed compact pump propulsion system water inlet flow passage and design method thereof
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