CN109185211B - A kind of pumping plant unit pressure pulsation prediction method instantaneously calculated based on Fluid Mechanics Computation - Google Patents
A kind of pumping plant unit pressure pulsation prediction method instantaneously calculated based on Fluid Mechanics Computation Download PDFInfo
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- CN109185211B CN109185211B CN201811283877.0A CN201811283877A CN109185211B CN 109185211 B CN109185211 B CN 109185211B CN 201811283877 A CN201811283877 A CN 201811283877A CN 109185211 B CN109185211 B CN 109185211B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
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Abstract
The present invention relates to a kind of pumping plant unit pressure pulsation prediction methods instantaneously calculated based on Fluid Mechanics Computation, through the invention, equidimension is carried out to pumping plant unit using 3 d modeling software and establishes model, multi-state calculating is carried out to pumping plant unit model by method of value solving, effective monitoring acquisition is carried out to unit specific position pressure fluctuation by setting monitoring point, and time-frequency spectrum analysis prediction is carried out to detection data, make up the single operating condition and deficiency of physical experiments, it also is the stable operation management of pumping plant unit safety, abnormal pressure pulsation is avoided to occur providing guidance.Simultaneously numerical simulation calculation can carry out multi-state calculate analysis, can expectable operating conditions all to pumping plant unit carry out calculating analysis, forecasting efficiency is greatly improved, simple and convenient, cost is relatively low.
Description
Technical field
The present invention relates to a kind of pumping plant unit pressure pulsation prediction methods instantaneously calculated based on Fluid Mechanics Computation, belong to
Hydraulic engineering field.
Background technique
Plain riparian area is to resist the disasters such as drought, flood, flood, is dispersed with a large amount of low lift flood control and disaster reduction axial-flow pumps.It is riverine
Axial-flow pump operation characteristic is that lift is low, flow is big, simultaneously because the variation of the Changjiang river tidal level, is raised so that pumping plant is often run to ultralow
Journey or even zero lift or negative lift, under this operating condition, axial-flow pump substantial deviation design conditions, flow exceeds design discharge 20%
~30% or more, abnormal water pressure fluctuation is easily induced, causes unit to resonate strongly, seriously threatens operational safety.
For the generation for effectively reducing pumping plant unit running process exception water pressure fluctuation phenomenon, prevent unit from generating resonance,
Two-way pump station unit booting security and stability is improved, existing patent is related to related measure at present: authorization patent of invention
CN201410841794 proposes a kind of non-homogeneous vane type guiding device, can farthest reduce in pond and be vortexed, improves leaf
It takes turns inlet flow uniformity and pressure fluctuation can be effectively reduced.The patent of invention can effectively reduce vortex, avoid phase
Congruent stator-rotor interaction frequency is superimposed and causes resonance peak, reduces the pressure fluctuation of impeller, improves the security and stability of water pump,
But Large Axial Flow Pump system resonance relevant issues are not directed to.Authorization patent of invention CN201210524582 proposes a kind of logical
It crosses and selects suitable movable guide vane number Zg, determine reasonable guide vane pitch circle diameter Dg and determine reasonable runner to fixed edge
The methods of distance δ, to reach the method for improving pressure pulsation of mixed-flow type pump turbine.The patent of invention mainly passes through really
The method for determining the mechanical parts parameter such as guide vane reaches after guide vane pressure fluctuation before runner, improves pump-storage generator operation stability
Purpose.But the patent is not related to mainly for mixed flow pump, and for axial-flow pump pressure fluctuation meter hydraulic resonance problem
And.
Existing patent, which mostly uses, changes the abnormal water pressure fluctuation phenomenon of the methods of flow passage components parameter improvement, for mammoth pump
It stands the prediction of unit pressure fluctuation, improves pumping station operation and manage security and stability, no this respect patent disclosure.
Summary of the invention
The purpose of the present invention in view of the above shortcomings of the prior art, is provided and a kind of is instantaneously calculated based on Fluid Mechanics Computation
Pumping plant unit pressure pulsation prediction method is based on the instantaneous calculation method of Fluid Mechanics Computation, using 3 d modeling software to pumping plant
Unit carries out equidimension and establishes model, carries out multi-state calculating to pumping plant unit model by method of value solving, passes through setting
Monitoring point carries out effective monitoring acquisition to unit specific position pressure fluctuation, and it is pre- to carry out time-frequency spectrum analysis to detection data
It surveys, makes up the single operating condition and deficiency of physical experiments, be also pumping plant unit safety stable operation management, avoid abnormal pressure
Pulsation occurs providing guidance.
The object of the present invention is achieved like this, a kind of pumping plant unit pressure arteries and veins instantaneously calculated based on Fluid Mechanics Computation
Dynamic prediction technique, characterized in that the following steps are included:
(1) foundation for carrying out numerical model to practical pumping plant unit by 3 d modeling software is guaranteeing the same of equidimension
When, it should also guarantee that numerical model restores pumping plant unit prototype as far as possible；
(2) grid dividing is carried out to the numerical model established through step (1) using mesh generation technology, guarantees integral grid
Quality is well conducive to improve numerical result accuracy；
(3) numerical model after step (2) grid dividing is carried out using CFD software for calculation permanent under any one operating condition
It calculates, guarantees that calculating residual values convergence precision is lower than 1.0 × 10-4, based on permanent calculated result, logarithm model is supervised
Measuring point setting, monitoring point includes water inlet flow channel monitoring point, outlet passage monitoring point, impeller monitoring point, guide vane monitoring point, and successively
Sampling time and sample frequency are set, and logarithm model carries out unsteady computation again, when obtaining instantaneous in sampling time section
Carve pressure data；
(4) by the acquisition to each monitoring point instantaneous moment pressure data in sampling time section, using empirical modal point
To each monitoring point of acquisition, unstable state data carry out at tranquilization resolving Algorithm in instantaneous moment pressure data in sampling time section
Then reason is changed again by Hilbert and obtains time-frequency spectrum, obtains frequency at amplitude maximum, i.e. dominant frequency；
(5) it is obtained by step (4) using the time-frequency spectrum that empirical mode decomposition algorithm and Hilbert change
Pressure fluctuation dominant frequency is at each monitoring point pressure fluctuation amplitude variations of pumping plant unit rule and size and each monitoring point to get arriving
Pressure fluctuation dominant frequency at water inlet flow channel monitoring point, pressure fluctuation dominant frequency at outlet passage monitoring point, pressure arteries and veins at impeller monitoring point
Pressure fluctuation dominant frequency at dynamic dominant frequency, guide vane monitoring point, is effectively predicted pressure fluctuation situation in corresponding measuring point actual condition, and lead to
Cross the appearance that dominant-frequency analysis knows that corresponding measuring point pressure fluctuation influences source, and abnormal pressure is avoided to pulse；
(6) dominant frequency and wheel rotation frequency at each monitoring point after empirical mode decomposition and Hilbert transform will be passed throughAnd its wheel rotation frequency frequency multiplication compares, f indicates wheel rotation frequency, and T indicates 1 week of wheel rotation；If
Water inlet flow channel measuring point dominant frequency, outlet passage measuring point dominant frequency and wheel rotation frequency or frequency multiplication are same or similar, then it is assumed that pumping plant
Unit, which is in, easily occurs resonance state；If wheel rotation frequency or frequency multiplication ingredient are not contained at impeller, guide vane in dominant frequency, then it is assumed that
There is abnormal water pressure fluctuation in pumping plant unit.
The advanced science of the method for the present invention is based on Fluid Mechanics Computation technology, using 3 d modeling software pair through the invention
Pumping plant unit model carries out three-dimensional equidimension modeling, carries out three-dimensional non-steady numerical simulation to model by numerical simulation technology,
Logarithmic mode result carries out pressure data acquisition, carries out Reduction Analysis, warp to pressure signal using based on empirical mode decomposition algorithm
Ambient noise can effectively be filtered by testing mode decomposition algorithm, accurately identify modal information, accurate Distinguishing diagnosis water pressure fluctuation shape
Forecasting efficiency is greatly improved in state, while improving axial-flow pump unit operation stability etc..
Technical principle: 3 d modeling software can the Design of Pump Station stage according to two-dimensional surface design drawing to pumping plant unit into
Row equidimension model foundation.Grid dividing software can according to size of mesh opening by model decomposition at separate unit one by one.It is three-dimensional
Numerical simulation exactly uses cfdrc to carry out numerical integration solution to limited multiple grid cells, and logarithm solves
As a result processing analysis is carried out.Unsteady computation is to carry out instantaneous result calculating to model on the basis of Three Dimensional Steady numerical value calculates
It solves, can know each moment unit pressure fluctuation state in certain a period of time, it is pre- in this, as pumping plant unit pressure fluctuation
Survey foundation.
The technology mainly comprises the steps that
(1) foundation for carrying out numerical model to practical pumping plant unit by 3 d modeling software is guaranteeing the same of equidimension
When, it should also guarantee numerical model reduction unit prototype as far as possible；
(2) grid dividing is carried out using mesh generation technology logarithm model, guarantees that integral grid quality is well conducive to
Improve numerical result accuracy；
(3) permanent calculating under a certain operating condition is carried out to model using CFD software for calculation, guarantees to calculate residual values convergence precision
Lower than 1.0 × 10-4, based on permanent calculated result, setting is monitored to model, and set gradually the sampling time and
Sample frequency carries out unsteady computation to model again, instantaneous moment pressure data in sampling time section can be obtained；
(4) by the acquisition to each moment pressure data of each measuring point, using empirical mode decomposition algorithm to unstable state data
Tranquilization processing is carried out, is then changed again by Hilbert and obtains time-frequency spectrum, obtain frequency i.e. dominant frequency f at amplitude maximumm。
(5) by empirical mode decomposition algorithm can know each monitoring point pressure fluctuation amplitude variations of pumping plant unit rule and
Size, and can know pressure fluctuation dominant frequency at the monitoring point, pressure fluctuation feelings in the measuring point actual condition can be effectively predicted
Condition, and can know that the measuring point pressure fluctuation mainly influences source by dominant-frequency analysis, what can be pulsed to avoid abnormal pressure goes out
It is existing.
(6) dominant frequency and wheel rotation frequency after empirical mode decomposition and Hilbert transform will be passed through at each measuring pointAnd its frequency multiplication compares.If inlet and outlet channel measuring point dominant frequency turns frequency (wheel rotation frequency) or frequency multiplication phase with impeller
It is same or close, then it is assumed that unit, which is in, easily occurs resonance state；If turning frequency or frequency multiplication without containing impeller in dominant frequency at impeller, guide vane
Ingredient, then it is assumed that unit has abnormal water pressure fluctuation.(general pumping plant unit mainly by water inlet flow channel, guide vane, impeller and goes out
Water flow passage composition, pressure fluctuation monitoring point, which is typically chosen, to be arranged in water inlet flow channel, impeller, guide vane and outlet passage to acquire
Pressure fluctuation data.In step 6, by pressure fluctuation master in pressure fluctuation monitoring point in water inlet flow channel, impeller, guide vane and outlet passage
Frequency and the frequency multiplication of wheel rotation frequency and wheel rotation frequency compare and analyze.If inlet and outlet channel measuring point dominant frequency and impeller turn
Frequency or frequency multiplication are same or similar, then it is assumed that unit, which is in, easily occurs resonance state；If leaf is not contained at impeller, guide vane in dominant frequency
Rotation frequency or frequency multiplication ingredient, then it is assumed that unit has abnormal water pressure fluctuation.)
The utility model has the advantages that Fluid Mechanics Computation calculating can not only simulate pumping plant unit operation flowing shape under different flow operating condition
State and pressure fluctuation state, additionally it is possible to calculate pumping plant operating states of the units under different impeller angle operating conditions.Calculating operation is easy, can
Repeated strong, accuracy is high, can effectively make up the deficiency of physical model, and can be effectively predicted in pumping plant unit actual motion and press
Power pulse state improves pumping plant unit operational safety stability.Empirical mode decomposition can be to collecting pressure fluctuation signal
Effective noise reduction process is carried out, vibrational state differentiation effectively can be carried out to pumping plant unit according to this patent prediction and evaluation method,
Abnormal water pressure fluctuation is diagnosed in time, and then prevents the generation of unit hydraulic resonance phenomenon, and it is steady to improve our station unit operational safety
It is qualitative.
Pumping plant unit pressure pulsation prediction method is based on the instantaneous calculation method of Fluid Mechanics Computation, is modeled using 3 D stereo
Software carries out equidimension modeling to pumping plant unit, by grid dividing, threedimensional model is imported cfdrc and is carried out
Main pressure pulsation point layout and Three-dimensional simulation calculate, and unit measuring point can be obtained by instantaneous calculation method and press in real time
Power microseismic data.There are more random elements in the reset pressure fluctuating signal being usually calculated, so needing to Empirical Mode
State decomposition method original signal carries out noise reduction, retains vibration signal characteristics dominant frequency, can be effectively predicted, judge pumping plant unit pressure
Power pulse state provides guidance for Design of Pump Station, operation and management.Numerical simulation calculation can carry out multi-state calculating simultaneously
Analysis, can expectable operating conditions all to pumping plant unit carry out calculating analysis, forecasting efficiency is greatly improved, simple and convenient, cost
It is lower.
As the riverine low-lift-head pumping station of the south water to north is constructed and implemented, presently, there are more Axial-Flow Pumps with Low Head stations there is exception
Oscillation phenomenon, therefore the present invention can apply and implement, and obtain biggish economic benefit and social benefit.
Detailed description of the invention
Fig. 1 is pumping plant unit pressure pulsation prediction method flow diagram.
Fig. 2 is that flow chart is judged in the pumping plant hydraulic vibration of empirical mode decomposition algorithm.
Fig. 3 is pumping plant unit three-dimensional entity model figure.
Fig. 4 is pressure fluctuation original signal example.
Fig. 5 is pressure fluctuation empirical mode decomposition example.
Specific embodiment
The present invention is described in further detail With reference to embodiment.
A kind of pumping plant unit pressure pulsation prediction method instantaneously calculated based on Fluid Mechanics Computation, characterized in that including
Following steps:
(1) foundation for carrying out numerical model to practical pumping plant unit by 3 d modeling software is guaranteeing the same of equidimension
When, it should also guarantee that numerical model restores pumping plant unit prototype as far as possible；
(2) grid dividing is carried out to the numerical model established through step (1) using mesh generation technology, guarantees integral grid
Quality is well conducive to improve numerical result accuracy；
(3) numerical model after step (2) grid dividing is carried out using CFD software for calculation permanent under any one operating condition
It calculates, guarantees that calculating residual values convergence precision is lower than 1.0 × 10-4, based on permanent calculated result, logarithm model is supervised
Measuring point setting, monitoring point includes water inlet flow channel monitoring point, outlet passage monitoring point, impeller monitoring point, guide vane monitoring point, and successively
Sampling time and sample frequency are set, and logarithm model carries out unsteady computation again, when obtaining instantaneous in sampling time section
Carve pressure data；
(4) by the acquisition to each monitoring point instantaneous moment pressure data in sampling time section, using empirical modal point
To each monitoring point of acquisition, unstable state data carry out at tranquilization resolving Algorithm in instantaneous moment pressure data in sampling time section
Then reason is changed again by Hilbert and obtains time-frequency spectrum, obtains frequency at amplitude maximum, i.e. dominant frequency；
(5) it is obtained by step (4) using the time-frequency spectrum that empirical mode decomposition algorithm and Hilbert change
Pressure fluctuation dominant frequency is at each monitoring point pressure fluctuation amplitude variations of pumping plant unit rule and size and each monitoring point to get arriving
Pressure fluctuation dominant frequency at water inlet flow channel monitoring point, pressure fluctuation dominant frequency at outlet passage monitoring point, pressure arteries and veins at impeller monitoring point
Pressure fluctuation dominant frequency at dynamic dominant frequency, guide vane monitoring point, is effectively predicted pressure fluctuation situation in corresponding measuring point actual condition, and lead to
Cross the appearance that dominant-frequency analysis knows that corresponding measuring point pressure fluctuation influences source, and abnormal pressure is avoided to pulse；
(6) dominant frequency and wheel rotation frequency at each monitoring point after empirical mode decomposition and Hilbert transform will be passed throughAnd its wheel rotation frequency frequency multiplication compares, f indicates wheel rotation frequency, and T indicates 1 week of wheel rotation；If into
Water flow passage measuring point dominant frequency, outlet passage measuring point dominant frequency and wheel rotation frequency or frequency multiplication are same or similar, then it is assumed that pumping plant machine
Group is in easily generation resonance state；If wheel rotation frequency or frequency multiplication ingredient are not contained at impeller, guide vane in dominant frequency, then it is assumed that pump
There is abnormal water pressure fluctuation in unit of standing.
The pumping plant unit pressure pulsation prediction method instantaneously calculated based on Fluid Mechanics Computation can be in designing institute's design phase
It is synchronous to carry out, set structure form can be designed to designing institute and carry out check optimization；Can also in the physical experiments stage, by
In physical experiments, time-consuming that consumptive material is more, it is difficult to carry out multi-state test, the pressure based on hydrodynamics software to unit model
Power pulsation prediction technique can effectively make up the deficiency of Physical Experiment；It can also be in pumping station operation management process, as guidance
A kind of effective means of pumping plant safe and stable operation simulates pumping plant actual operating mode pressure fluctuation state.
Claims (1)
1. a kind of pumping plant unit pressure pulsation prediction method instantaneously calculated based on Fluid Mechanics Computation, characterized in that including with
Lower step:
(1) foundation for carrying out numerical model to practical pumping plant unit by 3 d modeling software, while guaranteeing equidimension,
It should be guaranteed that numerical model restores pumping plant unit prototype as far as possible；
(2) grid dividing is carried out to the numerical model established through step (1) using mesh generation technology, guarantees integral grid quality
Well be conducive to improve numerical result accuracy；
(3) permanent meter under any one operating condition is carried out to the numerical model after step (2) grid dividing using CFD software for calculation
It calculates, guarantees that calculating residual values convergence precision is lower than 1.0 × 10-4, based on permanent calculated result, logarithm model is monitored
Point setting, monitoring point includes water inlet flow channel monitoring point, outlet passage monitoring point, impeller monitoring point, guide vane monitoring point, and is successively set
Sampling time and sample frequency are set, logarithm model carries out unsteady computation again, obtains instantaneous moment in sampling time section
Pressure data；
(4) it by the acquisition to each monitoring point instantaneous moment pressure data in sampling time section, is calculated using empirical mode decomposition
To each monitoring point of acquisition, unstable state data carry out tranquilization processing to method in instantaneous moment pressure data in sampling time section, so
Changed again by Hilbert afterwards and obtain time-frequency spectrum, obtains frequency at amplitude maximum, i.e. dominant frequency；
(5) pumping plant is obtained using the time-frequency spectrum that empirical mode decomposition algorithm and Hilbert change by step (4)
Pressure fluctuation dominant frequency is at each monitoring point pressure fluctuation amplitude variations of unit rule and size and each monitoring point to get to water inlet
Pressure fluctuation dominant frequency at runner monitoring point, pressure fluctuation dominant frequency at outlet passage monitoring point, pressure fluctuation master at impeller monitoring point
Frequently, pressure fluctuation dominant frequency at guide vane monitoring point is effectively predicted pressure fluctuation situation in corresponding monitoring point actual condition, and passes through
Dominant-frequency analysis knows the appearance that corresponding monitoring point pressure fluctuation influences source, and abnormal pressure is avoided to pulse；
(6) dominant frequency and wheel rotation frequency at each monitoring point after empirical mode decomposition and Hilbert transform will be passed throughAnd its wheel rotation frequency frequency multiplication compares, f indicates wheel rotation frequency, and T indicates 1 week of wheel rotation；If into
Water flow passage monitoring point dominant frequency, outlet passage monitoring point dominant frequency and wheel rotation frequency or frequency multiplication are same or similar, then it is assumed that pump
Unit of standing, which is in, easily occurs resonance state；If pressure fluctuation dominant frequency at impeller monitoring point, pressure fluctuation dominant frequency at guide vane monitoring point
In do not contain wheel rotation frequency or frequency multiplication ingredient, then it is assumed that there is abnormal water pressure fluctuation in pumping plant unit.
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| CN110162864B (en) * | 2019-05-15 | 2023-01-10 | 江苏省水利勘测设计研究院有限公司 | Method for predicting system stability of low-lift bidirectional operation pump station |
| CN112270144B (en) * | 2020-11-29 | 2022-04-08 | 江苏省水利工程科技咨询股份有限公司 | Method for detecting cavitation erosion of axial flow pump station gap |
| CN112711850A (en) * | 2020-12-30 | 2021-04-27 | 苏州绿科智能机器人研究院有限公司 | Unit online monitoring method based on big data |
| CN113011110B (en) * | 2021-02-22 | 2023-12-19 | 中国农业大学 | Pressure pulsation signal tracing method and device based on CFD post-processing |
| CN114251277A (en) * | 2021-12-22 | 2022-03-29 | 南水北调东线江苏水源有限责任公司 | Method for monitoring operation condition of water pump by comparing water flow pulsation conditions before and after pump section |
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| CN105354877A (en) * | 2015-11-09 | 2016-02-24 | 北京航空航天大学 | Three-dimensional grid processing method based on empirical mode decomposition and Hilbert spectrum calculation of space filling curve |
| CN107194145A (en) * | 2017-04-11 | 2017-09-22 | 江苏大学 | A kind of centrifugal pump cavitation corrosion Numerical Predicting Method |
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