CN108197390A - A kind of optimum design method of two-phase cryogenic liquid expanding machine anti-cavitation - Google Patents
A kind of optimum design method of two-phase cryogenic liquid expanding machine anti-cavitation Download PDFInfo
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Abstract
The invention discloses a kind of optimum design methods of two-phase cryogenic liquid expanding machine anti-cavitation, two-phase cryogenic liquid expanding machine vortex cavitation mechanism research including considering cryogen thermomechanical effect, the geometric parameter sensitivity analysis of two-phase cryogenic liquid expanding machine inward turning vortex cavitation flowing, the characterization statement of complicated vortex cavitating flows in two-phase cryogenic liquid expanding machine, the structure of flow fieldoptimization object function for the purpose of controlling vortex cavitating flows, and the Parallel implementation of the optimal control of vortex cavitating flows and anti-cavitation optimization design problem, this method can effectively promote the performance and operation stability of two-phase cryogenic liquid expanding machine.
Description
Technical field
The invention belongs to the technical fields such as cryogenic air separation and low-temperature liquefaction, are related to a kind of anti-sky of two-phase cryogenic liquid expanding machine
The optimum design method of change.
Background technology
Cryogenic liquid expanding machine is similar with conventional hydraulic (or fluid power) machinery as a kind of hydraulic machine, inevitably
Cavitation phenomenon occurs.Crumbling and fall for cavitation bubble will generate high local pressure, and great impact is caused to body structure surface material, production
Raw cavitation corrosion destroys；Unit vibration can be also induced, threatens the stable operation of liquid expander or even cryogenic system.Therefore, it is right
The effectively inhibition of cryogenic liquid expanding machine vortex cavitating flows is significant.
Cavitation phenomenon refers to that liquid local pressure less than saturated vapour pressure under relevant temperature, leads to liquid gasification and causes micro-
Explosive the phenomenon that increasing and crumbling and fall of bubble.Cavitation phenomenon is widely present in the hydraulics such as water pump, the hydraulic turbine and low temperature
The fields such as space division and low-temperature liquefaction.By the difference of its happening part, usually there are leaf cavitation, clearance cavitation, cavity cavitation and
Four kinds of forms of local cavitation.Usual cavity cavitation refers to be present in conventional hydraulic mechanical (such as turbine draft tube) by bumpy flow
The dynamic cavitation brought, intensity is high, it is big to take up space, and shows " pigtail beam " shape more, directly affects hydraulic machine performance and machine
Group reliability, and inducement-bumpy flow of this cavitation is substantially derived from the high speed rotation of impeller.It is mechanical as a kind of hydraulic turbine,
The high-speed rotating impeller of cryogenic liquid expanding machine will also result in the bumpy flow of high intensity and extend to diffuser pipe downstream, and then lure
Cavitation in foliation wheel exit and diffuser pipe.
For suppression cavitation, some optimum design methods are proposed for the Impeller Design of conventional hydraulic machine.Patent
201110202524.5 " a kind of anti-cavitation corrosion centrifugal pump impeller optimum design methods " using NSGA-II genetic algorithms as optimization tool,
Multi-objective optimization design of power is carried out to centrifugal pump impeller parameter, improves the efficiency of impeller and anti-cavitation performance.Patent
201510679202.8 " a kind of high anti-cavitation centrifugal impeller Hydraulic Design Methods " provide a kind of high anti-cavitation centrifugal impeller water
Hydraulic design method, using the side for improving vane inlet laying angle, vane thickness distribution, impeller inlet diameter and vane inlet width
Method improves centrifugal pump anti-cavitation performance.Patent 201510908837.0 " a kind of anti-cavitation axial-flow pump impeller design " discloses
A kind of anti-cavitation axial-flow pump impeller design method so that while the axial-flow pump impeller reliably working designed, have anti-cavitation
Ability.
It is more multiple in the vortex cavitation of low temperature hydraulic machine (such as cryogenic liquid expanding machine) compared with conventional hydraulic machine
It is miscellaneous.For room temperature hydraulic, the fuel factor of medium can almost be ignored, i.e., influence very little of the temperature to cavitation and ignore
Disregard.But the notable thermomechanical effect of cryogenic media so that low temperature cavitation is very sensitive to temperature change, and cryogenic media
Latent heat of phase change is big, and suchlike influence factor be can not ignore.Substantially, the high speed rotation of cryogenic liquid expanding machine impeller is made
Into its exit high intensity bumpy flow, local depression and Wen Sheng are resulted in, directly induces cavitation.But this vortex Cavitation flows with
The height coupling of cryogenic temperature field, significantly increases it and controls difficulty.And the cavitation of two-phase cryogenic liquid expanding machine is more notable, control
System is also increasingly complex.
Two-phase liquid (band gas) expanding machine is in cryogenic air separation, low-temperature liquefaction and other industrial flows and complementary energy recovery system
There is broad prospect of application.It is followed for example, US20120235415A1 is disclosed using the Rankine power of two-phase expanding machine-generating set
Ring energy-recuperation system.But the cavitation control of two-phase liquid expander is complicated, is not yet efficiently solved, constrains this technology
Application.Both make two-phase expanding machine involved in US20120235415A1 disclosure of that, but do not refer to two-phase expanding machine
Anti-cavitation problem.
For two-phase liquid expander, import medium is liquid, but passes through the decompressional expansion of expanding machine, partially liq
Medium is evaporated to gas so that outlet medium becomes being rich in the two-phase mixture of gas in liquid.It is especially noted that two-phase is swollen
The evaporation process of liquid medium can generate with the vacuole of considerable scale and induce serious cavitation in swollen machine.How two-phase liquid is controlled
Potentially notable cavitation is key technical problem there is an urgent need for breakthrough to body expanding machine.
Domestic and international range is seen at present, finds no the open report for closing two-phase liquid expander anti-cavitation technology.
Invention content
The shortcomings that it is an object of the invention to overcome the above-mentioned prior art, provides a kind of two-phase cryogenic liquid expanding machine and resists
The optimum design method of cavitation, this method can effectively promote the performance and operation stability of two-phase cryogenic liquid expanding machine.
In order to achieve the above objectives, the optimum design method of two-phase cryogenic liquid expanding machine anti-cavitation of the present invention includes
Consider the research of two-phase cryogenic liquid expanding machine vortex cavitation mechanism, the two-phase cryogenic liquid expanding machine of cryogen thermomechanical effect
The geometric parameter sensitivity analysis of inward turning vortex cavitation flowing, in two-phase cryogenic liquid expanding machine complicated vortex cavitating flows feature
Change statement, the structure of flow fieldoptimization object function for the purpose of controlling vortex cavitating flows and the optimization of vortex cavitating flows
Control and the Parallel implementation of anti-cavitation optimization design problem.
Consider the detailed process of the two-phase cryogenic liquid expanding machine vortex cavitation mechanism research of cryogen thermomechanical effect
For：The flowing of two-phase cryogenic liquid expanding machine interior cavitation is studied using Rayleigh-Plesset cavitation models, wherein,
Rayleigh-Plesset cavitation models and liquid expander complete machine numerical model are combined, to simulate two-phase cryogenic liquid
The numerical value of expanding machine vortex cavitation.
The Rayleigh-Plesset cavitation models include for cavitation being considered as the volume fraction control of two-phase three-component system
Equation processed, the mixed phase quality that there is identical speed to assume based on each component, Navier Stokesequation and gasify for predicting
Rate, vacuole generation and shattered to pieces Rayleigh-Plesset Equation.
The detailed process of geometric parameter sensitivity analysis of two-phase cryogenic liquid expanding machine inward turning vortex cavitation flowing is：
Change impeller and the geometry parameter and impeller of inducer and the phase position parameter of inducer, carry out and consider
The two-phase cryogenic liquid expanding machine vortex cavitation mechanism research of cryogen thermomechanical effect, determines two-phase cryogenic liquid expanding machine
Inward turning vortex cavitation flows most sensitive geometric parameter, wherein, the flowing of two-phase cryogenic liquid expanding machine inward turning vortex cavitation is the quickest
The geometric parameter of sense includes impeller maximum circumferential skewing angle, θ0M, blade and blade apex angle degreeThe angle of blade medium height position
DegreeInducer shape blade parameter, impeller and outlet inducer between circumferential relative position Δ α and it is circumferentially opposed away from
From Δ z.
The structure of flow fieldoptimization object function for the purpose of controlling vortex cavitating flows includes the following steps：To ensure two
The efficiency of phase cryogenic liquid expanding machine and anti-cavitation characteristic, the flow fieldoptimization mesh for the purpose of controlling vortex cavitating flows of structure
Scalar functions are：
Wherein, faveFor the area average gas percentage by volume of newly-designed two-phase cryogenic liquid expanding machine, fmaxIt is new
The maximum gas volume percentage of the two-phase cryogenic liquid expanding machine of design, eff are newly-designed two-phase cryogenic liquid expanding machine
Isentropic efficiency；AndRespectively the maximum gas volume percentage of the two-phase cryogenic liquid expanding machine of original design and
Average gas percentage by volume, C1、C2And C3For the proportion of three in flow fieldoptimization object function, C1、C2And C3Value be based on
Initial flow field simulation result.
The detailed process of the Parallel implementation of the optimal control of vortex cavitating flows and anti-cavitation optimization design problem is：
1) one group of candidate's two-phase cryogenic liquid expanding machine design sample point is produced using contrived experiment DOE approach, then distinguished
Numerical modeling and CFD simulations are carried out to each candidate two-phase cryogenic liquid expanding machine design sample point, be then based on numerical modeling and
The result of CFD simulations establishes initial kriging agent models, then excellent algorithm, CCEA and single step is asked to be expected parallel coevolution
Lifting function is combined foundation exploration-exploitation and is combined optimizing cycle, is combined in optimizing cycle in the exploration-exploitation, newly sets
The two-phase cryogenic liquid expanding machine sample point of meter continuously is selected and to start by adaptively sampled technology
Automatic CFD Evaluation carry out Flow Field Calculation and Performance Evaluation, to upgrade agent model and find optimal design ginseng
Number；
Wherein, startup Automatic CFD Evaluation carry out Flow Field Calculation and the concrete operations of Performance Evaluation are：
Design parameter vector is by Geometric parameterization module converters and generates new impeller and inducer, then pass through
Automatic topology feature carry out mesh generation to new impeller and inducer automatically, then pass through model file
The update of CFD model, boundary condition transitivity is carried out, finally carries out calculating and the performance of two-phase cryogenic liquid expanding machine heat flow field
Prediction；
2) after the calculating of two-phase cryogenic liquid expanding machine heat flow field convergence after, obtain two-phase cryogenic liquid expanding machine pressure,
The parameter distribution of temperature, torque of rotating shaft and gas volume percentage, then by pressure, temperature, torque of rotating shaft and gas body
The parameter distribution of product percentage is substituted into object function expression formula, with calculating target function；
3) cycle is iterated according to above-mentioned steps, until meeting scheduled optimizing search and terminating criterion, obtains two-phase
The anti-cavitation optimal design parameter of cryogenic liquid expanding machine.
The invention has the advantages that：
The optimum design method of two-phase cryogenic liquid expanding machine anti-cavitation of the present invention effectively can control impeller to revolve
The vortex motion in the coaxial inducer of impeller outlet and impeller downstream caused by turning, and then obtain two-phase cryogenic liquid expanding machine
Anti-cavitation optimal design parameter, to promote the performance and operation stability of two-phase cryogenic liquid expanding machine, while avoid vortex
The problem of two-phase cryogenic liquid expanding machine unit vibration that cavitation is induced and shutdown and space division liquefying plant stop production.
Description of the drawings
Fig. 1 a are the parametrization schematic diagram of impeller；
Fig. 1 b are the parametrization schematic diagram of inducer；
Fig. 1 c are the relative position schematic diagram of impeller and inducer；
Fig. 2 is the anti-cavitation optimization design flow diagram of the present invention.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings：
The optimum design method of two-phase cryogenic liquid expanding machine anti-cavitation of the present invention includes considering cryogen heat
The research of two-phase cryogenic liquid expanding machine vortex cavitation mechanism, the flowing of two-phase cryogenic liquid expanding machine inward turning vortex cavitation of mechanics effect
Geometric parameter sensitivity analysis, the characterization statement of complicated vortex cavitating flows in two-phase cryogenic liquid expanding machine, with control
The structure of flow fieldoptimization object function for the purpose of vortex cavitating flows and the optimal control of vortex cavitating flows and anti-cavitation are excellent
Change the Parallel implementation of design problem.
1st, consider the two-phase cryogenic liquid expanding machine vortex cavitation mechanism research of cryogen thermomechanical effect
The flowing of two-phase cryogenic liquid expanding machine interior cavitation is studied using Rayleigh-Plesset cavitation models,
Wherein, Rayleigh-Plesset cavitation models and liquid expander complete machine numerical model are combined, it is low to simulate two-phase
The numerical value of geothermal liquid expanding machine vortex cavitation, in addition, " thermomechanical effect " to consider cryogen, especially by saturated vapour pressure
And surface tension is expressed as the function varied with temperature, and in the iterative process in flow field, saturation vapour pressure and surface
Power real-time update with the variation in temperature field.
The Rayleigh-Plesset cavitation models include for cavitation being considered as the volume fraction control of two-phase three-component system
Equation processed, the mixed phase quality that there is identical speed to assume based on each component, Navier Stokesequation and gasify for predicting
Rate, vacuole generation and shattered to pieces Rayleigh-Plesset Equation.
2nd, the geometric parameter sensitivity analysis of two-phase cryogenic liquid expanding machine inward turning vortex cavitation flowing
Change impeller and the geometry parameter and impeller of inducer and the phase position parameter of inducer, carry out and consider
The two-phase cryogenic liquid expanding machine vortex cavitation mechanism research of cryogen thermomechanical effect, determines two-phase cryogenic liquid expanding machine
Inward turning vortex cavitation flows most sensitive geometric parameter.
Research shows that vortex motion stream originates from high-speed rotating impeller trailing edge in expanding machine, and as mainstream extends to diffusion
Pipe leads to local static pressure reduction in impeller outlet and downstream diffuser pipe, temperature raising, and then induces cavitation；It introduces same with impeller
The rotary outlet inducer of axis, significantly improves the flowing at impeller outlet, promotes local static pressure, temperature reduction, effectively presses down
Cavitation in impeller processed, but the outlet entire leaf of inducer blade trailing edge is high and leading edge wheel cover area still has cavitation, shows impeller, lures
Guide wheel runner geometry global optimization and matched necessity to realize flow optimized control, obtain anti-cavitation design.
As shown in Figure 1, these include impeller to the parameter of expanding machine cavitating flows sensitivity and induce the geometric form of impeller blade
Shape parameter and impeller-inducer relative position parameter.
Wherein, for impeller, the deformation of impeller is by adjustment impeller maximum circumferential skewing angle, θ in design process0M, blade and blade
Apex angle degreeWith middle high angleSensitive deformation is realized, with reference to figure 1a；
For inducer, inducer shape blade is free form surface rather than the vertical element curved surface of routine, wherein, cambered surface
Shape is stated by blade root, middle high and leaf top three stripe shape line drawings, and the Beta angles of every molded line are from blade inlet edge to trailing edge in non-
Linear distribution, and being parameterized by the Bezier curve containing 4 control points, by adjusting control point coordinate realize molded line and
The flexible deformation of curved surface, so as to provide very big degree of freedom for anti-cavitation design, with reference to figure 1b；
For impeller blade and inducer relative position, stator-rotor interaction is acted on and largely being taken between impeller-inducer
Relative axial position and diametrically opposite position certainly between two component blades row, to the vortex at impeller outlet and in inducer
Cavitation Characteristics have a major impact；To consider influence of the static-dynamic interference to Cavitation Characteristics, in anti-cavitation design, it is specifically incorporated leaf
Circumferential relative position Δ α and circumferentially opposed distance, delta z between wheel-outlet inducer, with reference to figure 1c.
3rd, the structure of the flow fieldoptimization object function for the purpose of controlling vortex cavitating flows
The design needs of conventional hydraulic machine (such as water pump) reach expected net positive suction head target, to control cavitation vapour
Erosion, this net positive suction head are simple pressure parameters, such as pump cavitation surplus refers to the Unit Weight liquid institute at Pump Suction Nozzle
Have be more than pressure for vaporization power surplus, i.e., it is quiet it is positive sucking energy head NPSH (Net Positive Suction Head).
But for cryogenic liquid expanding machine, it is improper, which is because, the heating power of cryogen that its cavitation characteristics is described with NPSH
It learns effect and so that the Cavitation Characteristics of cryogenic liquid expanding machine are increasingly complex, it depends not only on pressure, speed, also depends on simultaneously
Temperature, for this reason, it may be necessary to establish the anti-cavitation design object of suitable cryogenic liquid expanding machine.
To ensure the efficiency of two-phase cryogenic liquid expanding machine and anti-cavitation characteristic, structure using control vortex cavitating flows as
The flow fieldoptimization object function of purpose is：
Wherein, faveFor the area average gas percentage by volume of newly-designed two-phase cryogenic liquid expanding machine, fmaxIt is new
The maximum gas volume percentage of the two-phase cryogenic liquid expanding machine of design, eff are newly-designed two-phase cryogenic liquid expanding machine
Isentropic efficiency；AndRespectively the maximum gas volume percentage of the two-phase cryogenic liquid expanding machine of original design and
Average gas percentage by volume, C1、C2And C3For the proportion of three in flow fieldoptimization object function, C1、C2And C3Value be based on
Initial flow field simulation result.
5th, the Parallel implementation of the optimal control of vortex cavitating flows and anti-cavitation optimization design problem
As described above, the control of two-phase liquid expander vortex cavitation and anti-cavitation design transform into solution with impeller and lure
Guide wheel sensibility geometric parameter and its relative position parameter are asked by optimized variable, the optimization using the object function established as target
Topic, the two-phase liquid expander design parameter of anti-cavitation is obtained by solving this optimization problem.
The object function of anti-cavitation design optimization is obtained by temperature field-flow field of couple solution complexity, and
It needs to call heat flow field solver repeatedly in its iterative process solved；Cost is calculated to promote solving speed, saving, introduces generation
Manage model；And be to solve the defects of conventional agents model fixed sample often leads to local optimum, especially develop and adaptively adopted
The agent model of sample has been obviously improved the of overall importance of optimum search.
By geometric parameter module, heat flow field solver, based on adaptively sampled agent model and parallel optimization algorithm
It is combined, has developed the method for solving of expanding machine anti-cavitation design optimization, with reference to Fig. 2, the specific implementation to method for solving
Step and measure are described.
1) one group of candidate's two-phase cryogenic liquid expanding machine design sample point is produced using contrived experiment DOE approach, then distinguished
Numerical modeling and CFD simulations are carried out to each candidate two-phase cryogenic liquid expanding machine design sample point, be then based on numerical modeling and
The result of CFD simulations establishes initial kriging agent models, then excellent algorithm, CCEA and single step is asked to be expected parallel coevolution
Lifting function is combined foundation exploration-exploitation and is combined optimizing cycle, is combined in optimizing cycle in the exploration-exploitation, newly sets
The two-phase cryogenic liquid expanding machine sample point of meter continuously is selected and to start by adaptively sampled technology
Automatic CFD Evaluation carry out Flow Field Calculation and Performance Evaluation, to upgrade agent model and find optimal design ginseng
Number, this adaptive characteristic causes agent model precision to step up, but also optimization solver can be along global optimum
Target scans for, and reduce CFD calculate assessment take, accelerate two-phase cryogenic liquid expanding machine anti-cavitation design optimization into
Journey.
Wherein, in optimization process, Geometric parameterization modules and Automatic CFD
Evaluation modules are called repeatedly.In Geometric parameterization modules, impeller and inducer geometry
Shape generates once needing to carry out calculating assessment to new design sample at any time by self-editing geometric parameter program, then starts
Automatic CFD Evaluation modules, start Automatic CFD Evaluation modules carry out Flow Field Calculation and
The concrete operations of Performance Evaluation are：Design parameter vector is by Geometric parameterization module converters and generates new
Impeller and inducer, then grid is carried out to new impeller and inducer by Automatic topology feature automatically
It divides, the update of CFD model, boundary condition transitivity is then carried out by model file, it is swollen finally to carry out two-phase cryogenic liquid
The calculating of swollen machine heat flow field and the prediction of performance；
2) after the calculating of two-phase cryogenic liquid expanding machine heat flow field convergence after, obtain two-phase cryogenic liquid expanding machine pressure,
The parameter distribution of temperature, torque of rotating shaft and gas volume percentage, then by pressure, temperature, torque of rotating shaft and gas body
The parameter distribution of product percentage is substituted into object function expression formula, with calculating target function；
3) cycle is iterated according to above-mentioned steps, until meeting scheduled optimizing search and terminating criterion, obtains two-phase
The anti-cavitation optimal design parameter of cryogenic liquid expanding machine.
The above described is only a preferred embodiment of the present invention, not make limitation in any form to the present invention, though
So the present invention is disclosed above with preferred embodiment, however is not limited to the present invention, any technology people for being familiar with this profession
Member, without departing from the scope of the present invention, when the method and technique content using the disclosure above make it is a little more
Equivalent embodiment that is dynamic or being modified to equivalent variations, as long as being the content without departing from technical solution of the present invention, according to the present invention
Any simple modification, equivalent change and modification that technical spirit makees above example, still falls within technical solution of the present invention
In the range of.
Claims (6)
1. a kind of optimum design method of two-phase cryogenic liquid expanding machine anti-cavitation, which is characterized in that including considering cryogen
The two-phase cryogenic liquid expanding machine vortex cavitation mechanism research of thermomechanical effect, two-phase cryogenic liquid expanding machine inward turning vortex cavitation stream
The characterization statement of complicated vortex cavitating flows in dynamic geometric parameter sensitivity analysis, two-phase cryogenic liquid expanding machine, with control
The structure of flow fieldoptimization object function for the purpose of vortex cavitating flows processed and the optimal control of vortex cavitating flows and anti-cavitation
The Parallel implementation of optimization design problem.
2. the optimum design method of two-phase cryogenic liquid expanding machine anti-cavitation according to claim 1, which is characterized in that examine
The detailed process of two-phase cryogenic liquid expanding machine vortex cavitation mechanism research for considering cryogen thermomechanical effect is：Using
Rayleigh-Plesset cavitation models study the flowing of two-phase cryogenic liquid expanding machine interior cavitation, wherein, it will
Rayleigh-Plesset cavitation models are combined with liquid expander complete machine numerical model, swollen to simulate two-phase cryogenic liquid
Swollen machine vortex cavitating flows.
3. the optimum design method of two-phase cryogenic liquid expanding machine anti-cavitation according to claim 1, which is characterized in that institute
Rayleigh-Plesset cavitation models are stated to include cavitation being considered as the volume fraction governing equation of two-phase three-component system, be based on
Each component have identical speed assume mixed phase quality, Navier Stokesequation and for predict rate of gasification, vacuole generation
And shattered to pieces Rayleigh-Plesset Equation.
4. the optimum design method of two-phase cryogenic liquid expanding machine anti-cavitation according to claim 1, which is characterized in that two
The detailed process of geometric parameter sensitivity analysis of phase cryogenic liquid expanding machine inward turning vortex cavitation flowing is：
Change impeller and the geometry parameter and impeller of inducer and the phase position parameter of inducer, carry out and consider low temperature
The two-phase cryogenic liquid expanding machine vortex cavitation mechanism research of thermodynamic fluid effect, determines two-phase cryogenic liquid expanding machine inward turning
Vortex cavitation flows most sensitive geometric parameter, wherein, the flowing of two-phase cryogenic liquid expanding machine inward turning vortex cavitation is most sensitive
Geometric parameter includes impeller maximum circumferential skewing angle, θ0M, blade and blade apex angle degreeThe angle of blade medium height positionCircumferential relative position Δ α and circumferentially opposed distance between inducer shape blade parameter, impeller and outlet inducer
Δz。
5. the optimum design method of two-phase cryogenic liquid expanding machine anti-cavitation according to claim 1, which is characterized in that with
The structure of flow fieldoptimization object function for the purpose of control vortex cavitating flows includes the following steps：To ensure two-phase cryogenic liquid
The efficiency of expanding machine and anti-cavitation characteristic, the flow fieldoptimization object function for the purpose of controlling vortex cavitating flows of structure are：
Wherein, faveFor the area average gas percentage by volume of newly-designed two-phase cryogenic liquid expanding machine, fmaxNewly to design
Two-phase cryogenic liquid expanding machine maximum gas volume percentage, eff be newly-designed two-phase cryogenic liquid expanding machine etc.
Entropic efficiency；AndThe respectively maximum gas volume percentage and average air of the two-phase cryogenic liquid expanding machine of original design
Body percentage by volume, C1、C2And C3For the proportion of three in flow fieldoptimization object function, C1、C2And C3Value based on initial
Flow field simulation result.
6. the optimum design method of two-phase cryogenic liquid expanding machine anti-cavitation according to claim 1, which is characterized in that rotation
Vortex cavitation flow optimized controls and the detailed process of the Parallel implementation of anti-cavitation optimization design problem is：
1) one group of candidate's two-phase cryogenic liquid expanding machine design sample point is produced using contrived experiment DOE approach, then respectively to each
Candidate two-phase cryogenic liquid expanding machine design sample point carries out numerical modeling and CFD simulations, is then based on numerical modeling and CFD moulds
The result of plan establishes initial kriging agent models, then excellent algorithm, CCEA and single step is asked to be expected to promote letter parallel coevolution
Number is combined foundation exploration-exploitation and is combined optimizing cycle, is combined in optimizing cycle in the exploration-exploitation, newly-designed two
Phase cryogenic liquid expanding machine sample point is continuously selected and to start Automatic CFD by adaptively sampled technology
Evaluation carries out Flow Field Calculation and Performance Evaluation, to upgrade agent model and find optimal design parameters；
Wherein, startup Automatic CFD Evaluation carry out Flow Field Calculation and the concrete operations of Performance Evaluation are：Design
Parameter vector is by Geometric parameterization module converters and generates new impeller and inducer, then pass through
Automatic topology feature carry out mesh generation to new impeller and inducer automatically, then pass through model file
The update of CFD model, boundary condition transitivity is carried out, finally carries out calculating and the performance of two-phase cryogenic liquid expanding machine heat flow field
Prediction；
2) after the calculating of two-phase cryogenic liquid expanding machine heat flow field convergence, obtain the pressure of two-phase cryogenic liquid expanding machine, temperature,
The parameter distribution of torque of rotating shaft and gas volume percentage, then by pressure, temperature, torque of rotating shaft and gas volume percentage
Several parameter distributions is substituted into object function expression formula, with calculating target function；
3) cycle is iterated according to above-mentioned steps, until meeting scheduled optimizing search and terminating criterion, obtains two-phase low temperature
The anti-cavitation optimal design parameter of liquid expander.
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Effective date of registration: 20221117 Address after: 710075 Room 106, B1, Phase I, Yungu, Fengxi New Town, Xixian New Area, Xi'an, Shaanxi Patentee after: Kaishan (Xi'an) Turbine Machinery Co.,Ltd. Address before: Beilin District Xianning West Road 710049, Shaanxi city of Xi'an province No. 28 Patentee before: XI'AN JIAOTONG University |