CN108629070A - A kind of lateral influent stream pumping plant model test method for rectifying - Google Patents
A kind of lateral influent stream pumping plant model test method for rectifying Download PDFInfo
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- CN108629070A CN108629070A CN201810184081.3A CN201810184081A CN108629070A CN 108629070 A CN108629070 A CN 108629070A CN 201810184081 A CN201810184081 A CN 201810184081A CN 108629070 A CN108629070 A CN 108629070A
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- forebay
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
Abstract
The invention discloses a kind of lateral influent stream pumping plant model test method for rectifying, including step 1：Lateral influent stream Forebay of Pumping Station management measure, step 2 are set：Physical model, step 3 are built according to the plan of establishment：Mathematical model is built according to the plan of establishment and is calculated, step 4：Physical model calculating result and mathematical model result of calculation comparative analysis, step 5：Comprehensive analysis scheme result of calculation obtains optimal lateral Forebay of Pumping Station renovation scheme.The present invention, the improvement of pumping plant Inlet flow pattern can effectively improve the runnability of water pump, reduce sediment siltation, improve the reliability and economy of pumping station operation, reduce cost, improve benefit.
Description
Technical field
The present invention relates to a kind of lateral influent stream pumping plant model test method for rectifying, belong to water conservancy modelling technique field.
Background technology
The forebay of pumping plant is the important water conservancy project structure channel and water inlet flow channel reasonable link, mainly have it is positive into
Water forebay and side-direction forbay two major classes.It is uniform that fluidised form in forebay should will meet velocity flow profile, smooth in water flow, in pond not
Generate vortex etc. hydraulics, in order to flow can fluidised form it is good enter water inlet flow channel, to provide water pump it is good into
Water condition.Actual tests observe and later stage theoretical research prove, undesirable forebay make forebay flow generate reflux, whirlpool, into
Water flow is disorderly, deteriorates pump sump condition, causes pumping plant efficiency to decline, is shaken so as to cause pump house and unit, seriously
Shi Keneng leads to pump startup difficulty, cavitation, consonance of shaking noise etc..In the pumping plant in the more river of silt content, forebay is bad
Hydraulics can also cause the siltation of forebay bottom of pond or wash away.Therefore, improve the flow of Forebay of Pumping Station by necessary measure
Fluidised form, for improving pumping plant efficiency, sediment siltation being prevented to be of great significance.
Invention content
It is above-mentioned in order to solve the problems, such as, the invention discloses a kind of lateral influent stream pumping plant model test method for rectifying,
Its specific technical solution is as follows：
A kind of lateral influent stream pumping plant model test method for rectifying, including following operating procedure：
Step 1：Lateral influent stream Forebay of Pumping Station is set
" T " font diversion pier is set in lateral influent stream Forebay of Pumping Station, and T-shape diversion pier pier top elevation is equal to minimum water
Position, each corner degree of diversion pier is rounded corner；
Step 2：Physical model is built according to each plan of establishment
Physical model is forebay fluid flowing model, and the range of forebay fluid flowing model includes irrigation channel, forebay, intake pool and water inlet
Pipe, water inlet pipe include oviduct, and the upstream boundary in model river takes before intake pool at 6.5 times of maximum water surface width, model river
The downstream boundary in road takes after intake pool at 1.5 times of maximum water surface width,
When experiment, model equipment is by water supply water supplying pump, and each pump discharge is respectively by filling 4 electromagnetic flowmeters in respective pipeline
It measures and is adjusted respectively by 4 gate valves, to ensure that each pump discharge is identical；
Step 3：It builds mathematical model according to the plan of establishment and calculates and carry out forebay fluid flowing model structure with RNGk- ε models
It builds：
RNGk- ε models consider rotation and eddy flow situation in average flowing, it can handle original text strain rate and streamline is curved
Flowing big Qu Chengdu,
Its k equation and ε equations are as follows：
In formula,
Constant value is αk=αε=1.39, C1ε=1.42；C2ε=1.68, η0=4.377, β=0.012；
Step 4：Physical model calculating result and mathematical model result of calculation comparative analysis forebay prototype result of calculation：
Any rectification measure is not added in program forebay, under design water level, due to T-shaped river mouth incoming lateral intake, forebay
Interior large-scale whirlpool occur, two whirlpools are gradually reduced by face layer to bottom, and the flow velocity in whirlpool region is 0, prolonged to transport
Siltation can be formed after row herein, to influence the safety and stability of pumping plant；
" T " font diversion pier result of calculation：
Water stream enters the proportion bigger close to upstream side, more efficient close to upstream side Maelstrom to eliminate, together
When close to upstream side whirlpool edge isolate small whirlpool, in addition, also having adjusted the diversion pier of land side, it is therefore an objective to weaken flow
The eddies of water formed in land side after shunting；Extend diversion pier at a distance from water inlet simultaneously so that whirlpool after pier for
The influence of infall clockwise slope reduces；
Step 5：Comprehensive analysis scheme result of calculation obtains optimal lateral Forebay of Pumping Station renovation scheme
This pumping plant irrigation channel is " T " font lateral intake, in the case where not adding any engineering measure, transverse flow speed before standing
Greatly, there is the swirling flow of large area in irrigation channel internal surface layer and bottom, the sediment siltation be easy to causeing in irrigation channel, this will deteriorate into
Flow state, to influence pumping plant safety and economic operation；In order to optimize forebay fluidised form, " T " font water conservancy diversion is set in Forebay of Pumping Station
Pier simulates this Optimized Measures plus hopeless face layer and bottom current of the condition respectively under design water level of constructing by model test
State；The variation of the position, range, number of whirlpool in the face layer of comprehensive each scheme, bottom fluidised form, and consider the stabilization of rectification measure
Property, " T " font diversion pier is as lateral influent stream pumping plant fluidised form management measure.
The physical model is made of PVC plastic flitch, and forebay fluid flowing model makes according to geometric similarity, and considers roughness
It is similar.
The beneficial effects of the invention are as follows：
The present invention due to " T " font diversion pier front resistance effect, water flow through it is out-of-date can to diversion pier both sides separate, directly
Connecing leads to the flow direction cataclysm in left side so that the whirlpool range in left side becomes smaller, and then advantageously reduces sediment siltation, carries on the back simultaneously
The diversion pier of water side can effectively cut down the whirlpool that shunting generates later, to reach the mesh for flowing into water inlet of uniform fluid flow
's.The improvement of pumping plant Inlet flow pattern can effectively improve the runnability of water pump, reduce sediment siltation, improve pumping station operation
Reliability and economy, reduce cost, improve benefit.
Description of the drawings
Fig. 1 is the lateral influent stream pumping plant floor plan of the present invention,
Fig. 2 is T " the font diversion pier position views of the present invention,
Fig. 3 is " T " font diversion pier schematic shapes of the invention,
Fig. 4 is the forebay fluid flowing model experiment rough package drawing of the present invention.
Specific implementation mode
With reference to the accompanying drawings and detailed description, the present invention is furture elucidated.It should be understood that following specific implementation modes are only
For illustrating the present invention rather than limiting the scope of the invention.
This lateral influent stream pumping plant model test method for rectifying, including following operating procedure：
Step 1：Lateral influent stream pumping plant flow type of forebay scheme setting.
" T " font diversion pier, T-shape diversion pier pier top elevation are equal to lowest water level.Length of side 10cm (2.5m).Diversion pier is each
Corner degree is rounded corner.
Step 2：Physical model is built according to the plan of establishment.
The range of forebay fluid flowing model includes irrigation channel, forebay, intake pool and water inlet pipe (containing oviduct).Model river it is upper
Trip boundary takes before intake pool at 6.5 times of maximum water surface width, and the downstream boundary in model river takes 1.5 times of maximums after intake pool
At water surface width.Entire model is made of PVC plastic flitch, and the model equipment panorama after completing is shown in Fig. 4.
When experiment, model equipment is by water supply water supplying pump, and each pump discharge is respectively by filling 4 electromagnetic flowmeters in respective pipeline
It measures and is adjusted respectively by 4 gate valves, to ensure that each pump discharge is identical.Model makes according to geometric similarity, and considers roughness phase
Seemingly.
Step 3：Mathematical model is built according to the plan of establishment and is calculated.
Mathematical model structure is carried out with RNGk- ε models：
RNGk- ε models consider rotation and eddy flow situation in average flowing, it can handle original text strain rate and streamline is curved
Flowing big Qu Chengdu.
Its k equation and ε equations are as follows：
In formula,
Constant value is αk=αε=1.39, C1ε=1.42；C2ε=1.68, η0=4.377, β=0.012.
Step 4：Physical model calculating result and mathematical model result of calculation comparative analysis.
Prototype result of calculation：
It is not added with any rectification measure in program forebay, under design water level, due to T-shaped river mouth incoming lateral intake, is located at
There is large-scale whirlpool in lower left side and upper right side, and two whirlpools are gradually reduced by face layer to bottom, the flow velocity in whirlpool region
Almost it is 0, siltation can be formed herein after prolonged operation, to influence the safety and stability of pumping plant.
" T " font diversion pier result of calculation：
Water stream enters the proportion bigger in left side, more efficient to eliminate left side Maelstrom, while left side whirlpool side
Edge punishment separates out small whirlpool, in addition, also having adjusted the diversion pier of land side, it is therefore an objective to weaken water stream later in land side shape
At the eddies of water；Diversion pier is extended at a distance from water inlet simultaneously so that influence drop of the whirlpool for infall clockwise slope after pier
It is low.
Step 5：Each scheme result of calculation of comprehensive analysis obtains optimal lateral Forebay of Pumping Station renovation scheme.
This pumping plant irrigation channel is " T " font lateral intake, not plus in the case of any engineering measure, stand preceding transverse flow speed compared with
Greatly, there is the swirling flow of large area in irrigation channel internal surface layer and bottom, the sediment siltation be easy to causeing in irrigation channel, this will deteriorate into
Flow state, to influence pumping plant safety and economic operation.In order to optimize forebay fluidised form, " T " font is set in Forebay of Pumping Station herein
Diversion pier.This Optimized Measures are simulated plus hopeless face layer and bottom of the condition respectively under design water level of constructing by model test
Fluidised form.The variation of the position, range, number of whirlpool in the face layer of comprehensive each scheme, bottom fluidised form, and consider the steady of rectification measure
Qualitative, " T " font diversion pier is as lateral influent stream pumping plant fluidised form management measure.
The technical means disclosed in the embodiments of the present invention is not limited to the technical means disclosed in the above technical means, and further includes
By the above technical characteristic arbitrarily the formed technical solution of combination.
It is enlightenment with above-mentioned desirable embodiment according to the present invention, through the above description, relevant staff is complete
Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention
Property range is not limited to the contents of the specification, it is necessary to determine its technical scope according to right.
Claims (2)
1. a kind of lateral influent stream pumping plant model test method for rectifying, it is characterised in that including following operating procedure：
Step 1：Lateral influent stream Forebay of Pumping Station management measure is set
" T " font diversion pier is set in lateral influent stream Forebay of Pumping Station, and T-shape diversion pier pier top elevation is equal to lowest water level, leads
It is rounded corner to flow each corner degree of pier；
Step 2：Physical model is built according to the plan of establishment
Physical model is forebay fluid flowing model, and the range of forebay fluid flowing model includes irrigation channel, forebay, intake pool and water inlet pipe,
Water inlet pipe includes oviduct, and the upstream boundary in model river takes before intake pool at 6.5 times of maximum water surface width, model river
Downstream boundary takes after intake pool at 1.5 times of maximum water surface width,
When experiment, model equipment is by water supply water supplying pump, and each pump discharge is respectively by filling the measurement of 4 Electromagnetic Flows in respective pipeline
It measures and is adjusted respectively by 4 gate valves, to ensure that each pump discharge is identical；
Step 3：Mathematical model is built according to the plan of establishment and is calculated
Forebay fluid flowing model structure is carried out with RNG k- ε models：
RNG k- ε models consider rotation and eddy flow situation in average flowing, it can handle original text strain rate and streamline bending
The big flowing of degree,
Its k equation and ε equations are as follows：
In formula,η=(2EijEij)1/2k/ε；
Constant value is αk=αε=1.39, C1ε=1.42；C2ε=1.68, η0=4.377, β=0.012；
Step 4：Physical model calculating result and mathematical model result of calculation comparative analysis
Forebay prototype result of calculation：
It is not added with any rectification measure in program forebay, under design water level, due to T-shaped river mouth incoming lateral intake, goes out in forebay
Now large-scale whirlpool, two whirlpools are gradually reduced by face layer to bottom, and the flow velocity in whirlpool region is 0, runs it for a long time
After can form siltation herein, to influence the safety and stability of pumping plant；
" T " font diversion pier result of calculation：
Water stream enters the proportion bigger close to upstream side, more efficient close to upstream side Maelstrom to eliminate, and leans on simultaneously
Small whirlpool is isolated in nearly upstream side whirlpool edge, in addition, also having adjusted the diversion pier of land side, it is therefore an objective to weaken water stream
The eddies of water formed later in land side；Diversion pier is extended at a distance from water inlet simultaneously so that the whirlpool after pier is for water inlet
The influence of mouth fluidised form reduces；
Step 5：Comprehensive analysis scheme result of calculation obtains optimal lateral Forebay of Pumping Station renovation scheme
This pumping plant irrigation channel is " T " font lateral intake, and in the case where not adding any engineering measure, transverse flow speed is big before standing, and draws
There is the swirling flow of large area in river internal surface layer and bottom, the sediment siltation be easy to causeing in irrigation channel, this will deteriorate feed water flow
State, to influence pumping plant safety and economic operation；In order to optimize forebay fluidised form, " T " font diversion pier is set in Forebay of Pumping Station, is led to
It crosses model test and simulates this Optimized Measures plus hopeless face layer and bottom fluidised form of the condition respectively under design water level of constructing；It is comprehensive
The face layer of each scheme, in bottom fluidised form the position, range, number of whirlpool variation, and consider the stability of rectification measure, " T "
Font diversion pier is as lateral influent stream pumping plant fluidised form management measure.
2. a kind of lateral influent stream pumping plant model test method for rectifying according to claim 1, it is characterised in that the physics
Model is made of PVC plastic flitch, and forebay fluid flowing model makes according to geometric similarity, and considers that roughness is similar.
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Cited By (3)
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| CN109614757A (en) * | 2019-01-08 | 2019-04-12 | 河海大学 | A method of moist chamber type pumping plant critical submergence depth is predicted by CFD |
| CN111172937A (en) * | 2020-02-23 | 2020-05-19 | 扬州大学 | T-shaped contact bottom hole structure and comprehensive rectification method thereof |
| CN114482194A (en) * | 2021-12-31 | 2022-05-13 | 河海大学 | Optimize rectifier structure of horizontal water intaking flow state of trapezoidal river course section open channel |
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