CN108561195A - A kind of effective control method of cryogenic liquid expanding machine inward turning vortex cavitation flowing - Google Patents
A kind of effective control method of cryogenic liquid expanding machine inward turning vortex cavitation flowing Download PDFInfo
- Publication number
- CN108561195A CN108561195A CN201810008748.4A CN201810008748A CN108561195A CN 108561195 A CN108561195 A CN 108561195A CN 201810008748 A CN201810008748 A CN 201810008748A CN 108561195 A CN108561195 A CN 108561195A
- Authority
- CN
- China
- Prior art keywords
- cryogenic liquid
- expanding machine
- vortex
- liquid expanding
- cavitation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a kind of effective control methods of cryogenic liquid expanding machine inward turning vortex cavitation flowing, cryogenic liquid expanding machine vortex cavitation mechanism research including considering cryogen thermomechanical effect, the impeller geometric parameter sensitivity analysis of cryogenic liquid expanding machine inward turning vortex cavitation flowing, the characterization statement of complicated vortex cavitating flows in cryogenic liquid expanding machine, it builds flow fieldoptimization object function and flow fieldoptimization for the purpose of controlling vortex cavitating flows and controls variable, and the Parallel implementation of vortex cavitating flows Optimal Control Problem, this method can effectively improve the performance and operational reliability of cryogenic liquid expanding machine.
Description
Technical field
The invention belongs to the fields such as cryogenic air separation and low-temperature liquefaction, are related to a kind of cryogenic liquid expanding machine inward turning vortex cavitation stream
Dynamic effective control method.
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, the stable operation of liquid expander or even cryogenic system is threatened.Therefore, right
The effectively inhibition of cryogenic liquid expanding machine vortex cavitating flows is significant.
Cavitation phenomenon refers to that liquid local pressure is 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 exist leaf cavitation, clearance cavitation, cavity cavitation and
Four kinds of forms of local cavitation.Usual cavity cavitation refers to being 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 and anti-cavitation performance of impeller.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
At its exit high intensity bumpy flow, local depression and Wen Sheng are resulted in, cavitation is directly induced.But this vortex Cavitation flows with
Cryogenic temperature field is highly coupled, and significantly increases its control difficulty.Domestic and international range is seen at present, does not find the public affairs of this respect
Open data.
Invention content
It is an object of the invention to overcome the above-mentioned prior art, vortex in a kind of cryogenic liquid expanding machine is provided
Effective control method of cavitating flows, this method can effectively improve the performance and operational reliability of cryogenic liquid expanding machine.
In order to achieve the above objectives, effective control method of cryogenic liquid expanding machine inward turning vortex cavitation flowing of the present invention
The research of cryogenic liquid expanding machine vortex cavitation mechanism, cryogenic liquid expanding machine inward turning including considering cryogen thermomechanical effect
The impeller geometric parameter sensitivity analysis of vortex cavitation flowing, in cryogenic liquid expanding machine complicated vortex cavitating flows characterization table
It states, build flow fieldoptimization object function for the purpose of controlling vortex cavitating flows and flow fieldoptimization control variable and vortex
The Parallel implementation of cavitating flows Optimal Control Problem.
Consider that the detailed process of the cryogenic liquid expanding machine vortex cavitation mechanism research of cryogen thermomechanical effect is：It adopts
The flowing of cryogenic liquid expanding machine interior cavitation is studied with Rayleigh-Plesset cavitation models, by Rayleigh-
Plesset cavitation models are combined with liquid expander complete machine numerical model, to simulate liquid expander whirlpool cavitating flows.
The Rayleigh-Plesset cavitation models include that cavitation is considered as to the volume fraction control of two-phase three-component system
Equation processed, mixed phase quality, momentum and the energy equation that there is identical speed to assume based on each component and for predicting gas
Rate, the Rayleigh-Plesset Equation that vacuole generates and vacuole is shattered to pieces.
The concrete operations of impeller geometric parameter sensitivity analysis of cryogenic liquid expanding machine inward turning vortex cavitation flowing are：
Change impeller geometric parameter, obtains impeller of different shapes；Geometric Modeling, grid division and sky are carried out to each impeller
Change flow numerical simulation and analysis, to determine 7 most sensitive impeller geometric parameters of vortex cavitation, wherein seven leaves
Wheel geometric parameter includes the angle α between inducer outer end face and sagittal plane1, angle between inducer inner face and sagittal plane
α3, maximum wrap angle of the blade center parabola in circumferencial direction at inducer outer end face mean radiusOM, inducer outer end face leaf
Blade angle at topBlade angle at inducer outer end face mean radiusRadius R at impeller outlet blade root1
And radius R at impeller outlet leaf top2。
The characterization statement of complicated vortex cavitating flows includes vortex in cryogenic liquid expanding machine in cryogenic liquid expanding machine
The characterization statement of flowing and the characterization statement of cryogenic liquid expanding machine inward turning vortex cavitation flowing；
Vortex motion in cryogenic liquid expanding machine is characterized using the total pressure loss coefficient ζ of cryogenic liquid expanding machine
Statement, wherein
Wherein, PtFor the stagnation pressure of cryogenic liquid expanding machine, Pt=p+0.5 ρ (u2+v2+w2), Q is cryogenic liquid expanding machine
Flow, AinFor the inlet area of cryogenic liquid expanding machine.
The impeller geometric parameter sensitivity analysis flowed by cryogenic liquid expanding machine inward turning vortex cavitation shows cryogenic liquid
The impeller outlet average pressure of expanding machine influences cryogenic liquid expanding machine internal vortex cavitating flows, therefore utilizes nondimensionalization leaf
Wheel outlet average pressureThe characterization of cryogenic liquid expanding machine inward turning vortex cavitation flowing is stated, wherein
Wherein,For the impeller outlet average static pressure of initial designs, Pa'veGo out for candidate designs impeller in optimization process
Mouth average static pressure.
Build the tool of the flow fieldoptimization object function and flow fieldoptimization control variable for the purpose of controlling vortex cavitating flows
Body process is：
Utilize nondimensionalization impeller outlet average pressureWith linear group of the total pressure loss coefficient ζ of cryogenic liquid expanding machine
It closes, builds the object function of cryogenic liquid expanding machine vortex cavitation optimal control, wherein the cryogenic liquid expanding machine vortex of structure
The object function of cavitation optimal control is：
Subject to:Eff'＞ eff0-Δeff
eff0And eff' is respectively the isentropic efficiency of complete machine in initial designs and optimization process, ΔeffIt is efficiency to floating downward
Dynamic amplitude, C1And C2P is indicated respectivelya'veAnd the weight between ζ, wherein
Flow fieldoptimization control variable includes the angle α between inducer outer end face and sagittal plane1, inducer inner face and diameter
To the angle α between face3, maximum wrap angle of the blade center parabola in circumferencial direction at inducer outer end face mean radiusOM、
Blade angle at inducer outer end face leaf topBlade angle at inducer outer end face mean radiusImpeller goes out
Radius R at mouth blade root1And radius R at impeller outlet leaf top2。
The detailed process of the Parallel implementation of vortex cavitating flows Optimal Control Problem is：By cryogenic expansion machine vortex Cavitation flows
Dynamic characterization method is combined with based on adaptively sampled optimization method, and structure cryogenic liquid expanding machine vortex cavitating flows are excellent
Change control method, wherein the cryogenic liquid expanding machine vortex cavitating flows optimal control method includes that Kriging model is initial
Change module, adaptively sampled optimization module and sample and automatically analyzes module；
The specific work process of the Kriging model initialization module is：Determine optimized variable α1,α3,θ0M,R1,R2Variation range, using DOE experimental designs in optimized variable α1,α3,θ0M,R1,R2Variation
Several experiment samples are chosen in range, then by flow field CFD numerical simulations, are obtainedAnd the maximum value and minimum value of ζ, then will
And the maximum value and minimum value of ζ substitutes intoIn, to determine C1And C2；
Adaptively sampled optimization module includes the following steps：The structure of agent model and update；Using optimization algorithm with gram
In golden agent model be combined, solve EI auxiliary functions, to obtain new Impeller Design, then utilize new Impeller Design to generation
Reason model is updated；
Sample automatically analyzes module and includes the following steps：Obtain new optimized variable α1,α3,θ0M,R1,R2,
Again by new optimized variable α1,α3,θ0M,R1,R2Impeller three dimendional blade is converted to, flow field calculation device pair is then used
Flow field is iterated calculating, and judges whether to restrain according to the condition of convergence, when convergence, then obtains the information in flow field, then sharp
WithCalculating target function value, the profile of impeller vane after must optimizing；It, then will be current when not restraining
Optimized variable is referred in lopsided solution, and penalty function is then utilized to generate the optimized variable α of bigger1,α3,θ0M,R1,R2
Variation range.
The invention has the advantages that：
Effective control method of cryogenic liquid expanding machine inward turning vortex cavitation flowing of the present invention passes through to cryogenic liquid
The control of expanding machine inward turning vortex cavitation flowing can effectively control the vortex motion caused by impeller rotation, inhibit vortex motion
The cavitation of induction avoids cryogenic liquid expanding machine unit vibration, shutdown and space division liquefying plant that vortex cavitation is induced from stopping production,
The effective performance and operational reliability for improving cryogenic liquid expanding machine.
Description of the drawings
Fig. 1 is the schematic diagram of impeller shape parametrization；
Fig. 2 is the flow diagram of vortex cavitating flows optimal control in the present invention.
Specific implementation mode
The present invention is described in further detail below in conjunction with the accompanying drawings：
With reference to figure 1, effective control method of cryogenic liquid expanding machine inward turning vortex cavitation flowing of the present invention includes examining
Consider the research of cryogenic liquid expanding machine vortex cavitation mechanism, the cryogenic liquid expanding machine inward turning vortex cavitation of cryogen thermomechanical effect
The characterization statement of complicated vortex cavitating flows, structure in the impeller geometric parameter sensitivity analysis of flowing, cryogenic liquid expanding machine
The flow fieldoptimization object function and flow fieldoptimization built for the purpose of controlling vortex cavitating flows control variable and vortex Cavitation flows
The Parallel implementation of dynamic Optimal Control Problem.
1, consider that the detailed process of the cryogenic liquid expanding machine vortex cavitation mechanism research of cryogen thermomechanical effect is：
The flowing of cryogenic liquid expanding machine interior cavitation is studied using Rayleigh-Plesset cavitation models, it will
Rayleigh-Plesset cavitation models are combined with liquid expander complete machine numerical model, to simulate cryogenic liquid expanding machine whirlpool
Saturated vapour pressure and surface tension are especially expressed as by the numerical value of vortex cavitation in order to consider " the thermodynamics benefit " of cryogen
The function varied with temperature；In the iterative process in flow field, saturation vapour pressure is with surface tension with the change in temperature field
Change and real-time update；Mechanism study shows that vortex motion stream originates from high-speed rotating impeller trailing edge in cryogenic liquid expanding machine, and
As mainstream extends to diffuser pipe, local static pressure reduction, temperature in impeller outlet and downstream diffuser pipe is caused to increase, and then induce
Cavitation.
The Rayleigh-Plesset cavitation models include that cavitation is considered as to the volume fraction control of two-phase three-component system
Equation processed, mixed phase quality, momentum and the energy equation that there is identical speed to assume based on each component and for predicting gas
Rate, the Rayleigh-Plesset Equation that vacuole generates and vacuole is shattered to pieces.
2, the concrete operations of the impeller geometric parameter sensitivity analysis of low liquid expander inward turning vortex cavitation flowing are：
With reference to figure 1, changes impeller geometric parameter, obtain impeller of different shapes；Geometric Modeling is carried out to each impeller, is divided
Grid and cavitating flows numerical simulation and analysis, to determine 7 most sensitive impeller geometric parameters of vortex cavitation, wherein institute
It includes the angle α between inducer outer end face and sagittal plane to state seven impeller geometric parameters1, inducer inner face and sagittal plane it
Between angle α3, maximum wrap angle of the blade center parabola in circumferencial direction at inducer outer end face mean radiusOM, inducer
Blade angle at outer end face leaf topBlade angle at inducer outer end face mean radiusImpeller outlet blade root
Locate radius R1And radius R at impeller outlet leaf top2。
3, the characterization statement of complicated vortex cavitating flows includes cryogenic liquid expanding machine inward turning in cryogenic liquid expanding machine
The characterization statement of the dynamic characterization statement of vortex and the flowing of cryogenic liquid expanding machine inward turning vortex cavitation；
Vortex motion in cryogenic liquid expanding machine is characterized using the total pressure loss coefficient ζ of cryogenic liquid expanding machine
Statement, wherein
Wherein, PtFor the stagnation pressure of cryogenic liquid expanding machine, Pt=p+0.5 ρ (u2+v2+w2), Q is cryogenic liquid expanding machine
Flow, AinFor the inlet area of cryogenic liquid expanding machine.
The impeller geometric parameter sensitivity analysis flowed by cryogenic liquid expanding machine inward turning vortex cavitation shows impeller outlet
Average pressure significantly affects the flowing of liquid expander interior cavitation, and size not only reflects Cavitation Characteristics in impeller, also anti-
Cavitation Characteristics in the diffuser pipe of impeller downstream have been reflected, therefore have utilized nondimensionalization impeller outlet average pressureCryogenic liquid is expanded
The characterization of machine inward turning vortex cavitation flowing is stated, wherein
Wherein,For the impeller outlet average static pressure of initial designs, P'aveGo out for candidate designs impeller in optimization process
Mouth average static pressure.
4, flow fieldoptimization object function and flow fieldoptimization of the structure for the purpose of controlling vortex cavitating flows control variable
Detailed process is：
Utilize nondimensionalization impeller outlet average pressureWith linear group of the total pressure loss coefficient ζ of cryogenic liquid expanding machine
It closes, builds the object function of cryogenic liquid expanding machine vortex cavitation optimal control, wherein ζ characterizes impeller outlet vortex motion institute
Caused by flow losses, dimensionless impeller outlet average pressureCharacterize cavitating flows, the cryogenic liquid expanding machine vortex of structure
The object function of cavitation optimal control is：
Subject to:Eff'＞ eff0-Δeff
By above-mentioned object function target as an optimization, impeller vortex cavitating flows can be effectively inhibited, wherein eff0And
Eff' is respectively the isentropic efficiency of complete machine in initial designs and optimization process, Δeff(can choose 2%) is that efficiency is floated downwards
Amplitude, to prevent flow fieldoptimization during expanding machine overall performance decline, C1And C2P' is indicated respectivelyaveAnd the weight between ζ,
Wherein,
Before optimization starts, N number of experiment sample is determined by experimental design.Flow-data and correlation are obtained by numerical simulation
Information establishes initial agent model；By statistical analysis, obtain in experiment sampleWith the maximum and minimum value of ζ, then
Determine parameter C1And C2。
Flow fieldoptimization control variable includes the angle α between inducer outer end face and sagittal plane1, inducer inner face and diameter
To the angle α between face3, maximum wrap angle of the blade center parabola in circumferencial direction at inducer outer end face mean radiusOM、
Blade angle at inducer outer end face leaf topBlade angle at inducer outer end face mean radiusImpeller goes out
Radius R at mouth blade root1And radius R at impeller outlet leaf top2。
5, the detailed process of the Parallel implementation of vortex cavitating flows Optimal Control Problem is：
Cryogenic expansion machine vortex cavitating flows characterization method is combined with based on adaptively sampled optimization method, structure
Cryogenic liquid expanding machine vortex cavitating flows optimal control method is built, with reference to figure 2, wherein the cryogenic liquid expanding machine vortex
Cavitating flows optimal control method includes that Kriging model initialization module, adaptively sampled optimization module and sample divide automatically
Analyse module；
The specific work process of the Kriging model initialization module is：Determine optimized variable α1,α3,θ0M,R1,R2Variation range, using DOE experimental designs in optimized variable α1,α3,θ0M,R1,R2Variation
Choose several experiment samples in range, then by flow field CFD numerical simulations, to obtain its corresponding target function value, however
Initial agent model is established on the basis of this, then D0E test samples are counted by analysis, is obtainedAnd the maximum value and minimum of ζ
Then value willAnd the maximum value and minimum value of ζ substitutes intoIn, to determine C1And C2；
Adaptively sampled optimization module includes the following steps：The structure of agent model and update, i.e., replaced using agent model
The CFD that generation takes is calculated, and is completed the assessment of candidate designs, is accelerated the process of optimizing；And using optimization algorithm with gram in Jin Dynasty manage
Model is combined, solve EI auxiliary functions, to obtain new Impeller Design, then utilize new Impeller Design to agent model into
Row update；
Sample automatically analyzes module and includes the following steps：Obtain new optimized variable α1,α3,θ0M,R1,R2,
Again by new optimized variable α1,α3,θ0M,R1,R2Impeller three dimendional blade is converted to, flow field calculation device pair is then used
Flow field is iterated calculating, and judges whether to restrain according to the condition of convergence, when convergence, then obtains the information in flow field, then sharp
WithCalculating target function value, the profile of impeller vane after must optimizing；It, then will be current when not restraining
Optimized variable is referred in lopsided solution, and penalty function is then utilized to generate the optimized variable α of bigger1,α3,θ0M,R1,R2
Variation range.
The continuous interaction that module is automatically analyzed by optimization algorithm main program and sample carries out in real time more Kriging model
Newly, the characteristic information of optimization problem is captured, corrects optimizing approach in real time, is searched for along the direction of global solution, until reaching knot
Beam condition stops search and exports the profile of impeller vane after optimization.
Claims (7)
1. a kind of effective control method of cryogenic liquid expanding machine inward turning vortex cavitation flowing, which is characterized in that including considering low temperature
The cryogenic liquid expanding machine vortex cavitation mechanism research of thermodynamic fluid effect, cryogenic liquid expanding machine inward turning vortex cavitation flow
The characterization statement of complicated vortex cavitating flows, structure are to control in the sensitivity analysis of impeller geometric parameter, cryogenic liquid expanding machine
Flow fieldoptimization object function and flow fieldoptimization control variable for the purpose of vortex cavitating flows processed and the optimization of vortex cavitating flows
The Parallel implementation of control problem.
2. effective control method of cryogenic liquid expanding machine inward turning vortex cavitation flowing according to claim 1, feature exist
In the detailed process of the cryogenic liquid expanding machine vortex cavitation mechanism research of consideration cryogen thermomechanical effect is：Using
Rayleigh-Plesset cavitation models study the flowing of cryogenic liquid expanding machine interior cavitation, by Rayleigh-
Plesset cavitation models are combined with liquid expander complete machine numerical model, to simulate liquid expander whirlpool cavitating flows.
3. effective control method of cryogenic liquid expanding machine inward turning vortex cavitation flowing according to claim 1, feature exist
In the Rayleigh-Plesset cavitation models include that cavitation is considered as to the volume fraction controlling party of two-phase three-component system
Journey has mixed phase quality, momentum and the energy equation of identical speed hypothesis based on each component and for predicting gasification
Rate, the Rayleigh-Plesset Equation that vacuole generates and vacuole is shattered to pieces.
4. effective control method of cryogenic liquid expanding machine inward turning vortex cavitation flowing according to claim 1, feature exist
In the concrete operations of the impeller geometric parameter sensitivity analysis of cryogenic liquid expanding machine inward turning vortex cavitation flowing are：
Change impeller geometric parameter, obtains impeller of different shapes；Geometric Modeling, grid division and Cavitation flows are carried out to each impeller
Dynamic numerical simulation and analysis, to determine 7 most sensitive impeller geometric parameters of vortex cavitation, wherein seven impellers are several
What parameter includes the angle α between inducer outer end face and sagittal plane1, angle α between inducer inner face and sagittal plane3, lure
Maximum wrap angle of the blade center parabola in circumferencial direction at guide wheel outer end face mean radiusOM, at inducer outer end face leaf top
Blade angleBlade angle at inducer outer end face mean radiusRadius R at impeller outlet blade root1And impeller
Export radius R at leaf top2。
5. effective control method of cryogenic liquid expanding machine inward turning vortex cavitation flowing according to claim 1, feature exist
In the characterization statement of complicated vortex cavitating flows includes vortex motion in cryogenic liquid expanding machine in cryogenic liquid expanding machine
Characterize the characterization statement of statement and the flowing of cryogenic liquid expanding machine inward turning vortex cavitation；
Characterization table is carried out to vortex motion in cryogenic liquid expanding machine using the total pressure loss coefficient ζ of cryogenic liquid expanding machine
It states, wherein
Wherein, PtFor the stagnation pressure of cryogenic liquid expanding machine, Pt=p+0.5 ρ (u2+v2+w2), Q is the flow of cryogenic liquid expanding machine,
AinFor the inlet area of cryogenic liquid expanding machine；
The impeller geometric parameter sensitivity analysis flowed by cryogenic liquid expanding machine inward turning vortex cavitation shows that cryogenic liquid expands
The impeller outlet average pressure of machine influences cryogenic liquid expanding machine internal vortex cavitating flows, therefore is gone out using nondimensionalization impeller
Mouth average pressureThe feature of cryogenic liquid expanding machine inward turning vortex cavitation flowing is stated, wherein
Wherein,For the impeller outlet average static pressure of initial designs, P'aveIt is flat for the outlet of candidate designs impeller in optimization process
Equal static pressure.
6. effective control method of cryogenic liquid expanding machine inward turning vortex cavitation flowing according to claim 1, feature exist
In the detailed process of flow fieldoptimization object function and flow fieldoptimization control variable of the structure for the purpose of controlling vortex cavitating flows
For：
Utilize nondimensionalization impeller outlet average pressureWith the linear combination of the total pressure loss coefficient ζ of cryogenic liquid expanding machine, structure
Build the object function of cryogenic liquid expanding machine vortex cavitation optimal control, wherein the cryogenic liquid expanding machine vortex cavitation of structure
The object function of optimal control is：
eff0And eff' is respectively the isentropic efficiency of complete machine in initial designs and optimization process, ΔeffIt floats downwards for efficiency
Amplitude, C1And C2P' is indicated respectivelyaveAnd the weight between ζ, wherein
Flow fieldoptimization control variable includes the angle α between inducer outer end face and sagittal plane1, inducer inner face and sagittal plane
Between angle α3, maximum wrap angle of the blade center parabola in circumferencial direction at inducer outer end face mean radiusOM, induction
Take turns the blade angle at outer end face leaf topBlade angle at inducer outer end face mean radiusImpeller outlet leaf
Radius R at root1And radius R at impeller outlet leaf top2。
7. effective control method of cryogenic liquid expanding machine inward turning vortex cavitation flowing according to claim 1, feature exist
In the detailed process of the Parallel implementation of vortex cavitating flows Optimal Control Problem is：Cryogenic expansion machine vortex cavitating flows are special
Signization method is combined with based on adaptively sampled optimization method, structure cryogenic liquid expanding machine vortex cavitating flows optimization control
Method processed, wherein the cryogenic liquid expanding machine vortex cavitating flows optimal control method includes Kriging model initialization mould
Block, adaptively sampled optimization module and sample automatically analyze module；
The specific work process of the Kriging model initialization module is：Determine optimized variable α1,α3,θ0M,R1,
R2Variation range, using DOE experimental designs in optimized variable α1,α3,θ0M,R1,R2Variation range in choose
Several experiment samples, then by flow field CFD numerical simulations, obtainAnd the maximum value and minimum value of ζ, then willAnd the maximum value of ζ
It is substituted into minimum valueIn, to determine C1And C2；
Adaptively sampled optimization module includes the following steps：The structure of agent model and update；Using optimization algorithm and Ke Lijin
Agent model is combined, and EI auxiliary functions is solved, to obtain new Impeller Design, then using new Impeller Design to acting on behalf of mould
Type is updated；
Sample automatically analyzes module and includes the following steps：Obtain new optimized variable α1,α3,θ0M,R1,R2, then will
New optimized variable α1,α3,θ0M,R1,R2Impeller three dimendional blade is converted to, flow field calculation device stream field is then used
It is iterated calculating, and judges whether to restrain according to the condition of convergence, when convergence, then the information in flow field is obtained, then utilizesCalculating target function value, the profile of impeller vane after must optimizing；It, then will be current excellent when not restraining
Change variable to be referred in lopsided solution, penalty function is then utilized to generate the optimized variable α of bigger1,α3,θ0M,R1,R2's
Variation range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810008748.4A CN108561195B (en) | 2018-01-04 | 2018-01-04 | Effective control method for vortex cavitation flow in low-temperature liquid expander |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810008748.4A CN108561195B (en) | 2018-01-04 | 2018-01-04 | Effective control method for vortex cavitation flow in low-temperature liquid expander |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108561195A true CN108561195A (en) | 2018-09-21 |
| CN108561195B CN108561195B (en) | 2020-11-10 |
Family
ID=63529560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810008748.4A Active CN108561195B (en) | 2018-01-04 | 2018-01-04 | Effective control method for vortex cavitation flow in low-temperature liquid expander |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108561195B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110704965A (en) * | 2019-09-17 | 2020-01-17 | 北京理工大学 | Cavitation model correction method suitable for dynamic boundary cavitation streaming |
| CN113158355A (en) * | 2021-01-29 | 2021-07-23 | 西安交通大学 | Low-temperature liquid expander full-working-condition optimization design method |
| CN113158356A (en) * | 2021-01-29 | 2021-07-23 | 西安交通大学 | Collaborative optimization design method for anti-cavitation rectification cone of low-temperature liquid expansion machine |
| CN114357632A (en) * | 2022-03-21 | 2022-04-15 | 潍柴动力股份有限公司 | Oil sprayer optimization method and device |
| US11614061B2 (en) | 2020-09-30 | 2023-03-28 | Jiangsu University | Diesel fuel injector based on hollow spray structure induced by vortex cavitation in nozzle |
| CN117307266A (en) * | 2023-08-31 | 2023-12-29 | 中科合肥技术创新工程院 | Control system for vortex cavitation flow in low-temperature liquid expander |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100258046A1 (en) * | 2007-05-17 | 2010-10-14 | Vladimir Berger | Method and apparatus for suppressing cavitation on the surface of a streamlined body |
| WO2014193792A1 (en) * | 2013-05-28 | 2014-12-04 | Vulcan Intellectual Properties Llc | System, method and apparatus for controlling ground or concrete temperature |
| CN105298908A (en) * | 2015-10-16 | 2016-02-03 | 江苏大学 | High-cavitation-resistance centrifugal impeller hydraulic design method |
-
2018
- 2018-01-04 CN CN201810008748.4A patent/CN108561195B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100258046A1 (en) * | 2007-05-17 | 2010-10-14 | Vladimir Berger | Method and apparatus for suppressing cavitation on the surface of a streamlined body |
| WO2014193792A1 (en) * | 2013-05-28 | 2014-12-04 | Vulcan Intellectual Properties Llc | System, method and apparatus for controlling ground or concrete temperature |
| CN105298908A (en) * | 2015-10-16 | 2016-02-03 | 江苏大学 | High-cavitation-resistance centrifugal impeller hydraulic design method |
Non-Patent Citations (2)
| Title |
|---|
| 司马铭等: "大型空分设备用低温液体膨胀机内流及空化特性数值研究", 《深冷技术》 * |
| 徐彬雪等: "基于 CFturbo-PumpLinx 的离心泵流场模拟与结构优化", 《蚌埠学院学报》 * |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110704965A (en) * | 2019-09-17 | 2020-01-17 | 北京理工大学 | Cavitation model correction method suitable for dynamic boundary cavitation streaming |
| CN110704965B (en) * | 2019-09-17 | 2021-02-09 | 北京理工大学 | Cavitation model correction method suitable for dynamic boundary cavitation streaming |
| US11614061B2 (en) | 2020-09-30 | 2023-03-28 | Jiangsu University | Diesel fuel injector based on hollow spray structure induced by vortex cavitation in nozzle |
| CN113158355A (en) * | 2021-01-29 | 2021-07-23 | 西安交通大学 | Low-temperature liquid expander full-working-condition optimization design method |
| CN113158356A (en) * | 2021-01-29 | 2021-07-23 | 西安交通大学 | Collaborative optimization design method for anti-cavitation rectification cone of low-temperature liquid expansion machine |
| CN113158355B (en) * | 2021-01-29 | 2022-10-25 | 西安交通大学 | All-condition optimization design method for low-temperature liquid expander |
| CN113158356B (en) * | 2021-01-29 | 2022-12-09 | 西安交通大学 | Collaborative optimization design method for anti-cavitation rectification cone of low-temperature liquid expander |
| CN114357632A (en) * | 2022-03-21 | 2022-04-15 | 潍柴动力股份有限公司 | Oil sprayer optimization method and device |
| CN114357632B (en) * | 2022-03-21 | 2022-07-15 | 潍柴动力股份有限公司 | Oil sprayer optimization method and device |
| CN117307266A (en) * | 2023-08-31 | 2023-12-29 | 中科合肥技术创新工程院 | Control system for vortex cavitation flow in low-temperature liquid expander |
| CN117307266B (en) * | 2023-08-31 | 2024-03-19 | 中科合肥技术创新工程院 | Control system for vortex cavitation flow in low-temperature liquid expander |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108561195B (en) | 2020-11-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108561195A (en) | A kind of effective control method of cryogenic liquid expanding machine inward turning vortex cavitation flowing | |
| CN108197390B (en) | Cavitation-resistant optimal design method for two-phase low-temperature liquid expander | |
| CN109578085B (en) | Method for weakening unsteady acting force of turbine movable blade through guide blade inclination | |
| Yang et al. | Computational study on the performance improvement of axial-flow pump by inlet guide vanes at part loads | |
| CN113158356B (en) | Collaborative optimization design method for anti-cavitation rectification cone of low-temperature liquid expander | |
| Zhang et al. | A new proposed return guide vane for compact multistage centrifugal pumps | |
| Han et al. | Multiple parameters and multiple conditions optimization based on two steps strategy for an axial flow pump | |
| Oliy et al. | Design and Computational Fluid Dynamic Simulation Study of High Efficiency Cross Flow Hydro-power Turbine | |
| Zhao et al. | The Influence of tip clearance on supercritical CO2 centrifugal compressor performance | |
| Qi et al. | A comparative study on the reducing flow rate design method for a desalination energy recovery pump as turbine | |
| Kim et al. | Effects of blade geometry on performance of Wells turbine for wave power conversion | |
| Xue et al. | Research and optimization of performances of a pump turbine in pump mode | |
| Zhong et al. | Effects of probe stem surface suction on the aerodynamic performance of a compressor | |
| Liang et al. | The recent progresses in industrial centrifugal compressor designs | |
| Qin et al. | Differential Evolutionary modeling and starting-up cavitation characteristics analysis for multistage centrifugal pump | |
| Xin et al. | Impact of Slots on the Aerodynamic Performance of the Variable Inlet Guide Vane Cascade of a Centrifugal Compressor | |
| Ma et al. | Impact of a combination of micro-vortex generator and boundary layer suction on performance in a high-load compressor cascade | |
| Shi et al. | Thermodynamic design and aerodynamic analysis of supercritical carbon dioxide turbine | |
| Hoznedl et al. | Exhaust hood for steam turbines-single-flow arrangement | |
| Zhu et al. | Investigation on interaction between geometry and performance and design of S-CO2 radial inflow turbine’s vaneless inlet volute | |
| Bin Osman et al. | The effects of surge motion on floating horizontal axis tidal turbines | |
| Zhou et al. | CFD investigation on the application of optimum non-axisymmetric endwall profiling for a vaned diffuse | |
| Zhang et al. | Influence of posterior cavity structure on axial force and pressure distribution of stamping pump | |
| Tian et al. | Cavitation performance analysis and optimal design of the portable electric-driven axial flow pump | |
| Chen et al. | Genetic optimization design for aerodynamic structure of oblique flow compressor radial inlet chamber in compressed air energy storage system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |