CN109612694A - A kind of window type draining derrick discharge coefficient measuring method - Google Patents
A kind of window type draining derrick discharge coefficient measuring method Download PDFInfo
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- CN109612694A CN109612694A CN201811260068.8A CN201811260068A CN109612694A CN 109612694 A CN109612694 A CN 109612694A CN 201811260068 A CN201811260068 A CN 201811260068A CN 109612694 A CN109612694 A CN 109612694A
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- 238000012360 testing method Methods 0.000 claims abstract description 15
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- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 238000003786 synthesis reaction Methods 0.000 claims description 5
- 230000001133 acceleration Effects 0.000 claims description 4
- 238000013459 approach Methods 0.000 claims description 4
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- 238000010586 diagram Methods 0.000 description 3
- 238000006424 Flood reaction Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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Abstract
The present invention relates to window types to drain derrick discharge coefficient measuring method, belongs to Hydraulic Structure Engineering and model test field.The present invention creates draining shaft hydraulic model by practical draining shaft relevant parameter；The head and vent flow of window are drained in practical draining shaft by testing under different operating conditions；In newly-built draining shaft hydraulic model, the curve of draining window weir head and vent flow is determined；According to the curved line relation of draining window weir head and vent flow, in the case where flooding collar tie beam in various degree, the aerial drainage mode of newly-built draining shaft draining window is determined；According to weir flow integrated flow rate coefficient formula solve weir head and vent flow in the case where drain window difference aerial drainage mode corresponding to integrated flow rate coefficient.The relationship of integrated flow rate coefficient corresponding to the accurate reflection window weir head of present invention energy and vent flow is analyzed by flooding degree influence to collar tie beam difference, window type is promoted to drain the raising of derrick discharge coefficient measurement.
Description
Technical field
The present invention relates to a kind of window types to drain derrick discharge coefficient measuring method, belongs to Hydraulic Structure Engineering and model tries
Test technical field.
Background technique
The case where being frequently encountered measurement discharge coefficient in practical projects, but all simplify engineering stream as far as possible in analysis
MechanicsCalculated, by its it is simple judge, not account for fluid can occur various streams during flowing
Amount pulsation, can generate hydraulic loss, especially at pipe bending, have aperture to let out at pipe diameter variation or in cylinder body
Dew etc. will use discharge coefficient.Simple so required discharge coefficient is applied in Practical Project cannot obtain preferably
Effect.
Summary of the invention
The technical problem to be solved by the present invention is the present invention provides a kind of window type draining derrick discharge coefficient measurement side
Method, in the case where flooding collar tie beam in various degree, newly-built draining shaft draining window difference to go out the synthesis under stream mode
Effective measurement of discharge coefficient.
The technical scheme is that: a kind of window type draining derrick discharge coefficient measuring method, the specific step of the method
It is rapid as follows:
Step1, pass through practical draining shaft relevant parameter, newly-built draining shaft hydraulic model；
Step2, by testing, the head of draining window and vent flow are new to get arriving in practical draining shaft under different operating conditions
It builds in draining shaft hydraulic model and drains the head and vent flow of window；
Step3, in newly-built draining shaft hydraulic model, determine draining window weir head and vent flow curve；
Step4, according to draining window weir head and vent flow curved line relation, in various degree flood collar tie beam the case where
Under, determine the aerial drainage mode of newly-built draining shaft draining window；
Newly-built draining shaft drains window aerial drainage first in the form of free weir flow；
When just reaching collar tie beam critical part, window is drained with free hole manifold formula aerial drainage；
When flooding collar tie beam, window is drained with hole weir mixed form aerial drainage；
Step5, according to weir flow integrated flow rate coefficient formula solve in the case where drain window difference aerial drainage mode weir head and
Integrated flow rate coefficient corresponding to vent flow, so that it is right to obtain weir head and vent flow institute under draining window difference aerial drainage mode
The integrated flow rate coefficient range answered.
In the step Step 5, the formula of weir flow integrated flow rate coefficient isM is the stream of weir flow in formula
Coefficient of discharge, including side are shunk, the discharge coefficient for the synthesis that velocity of approach head and other factors influence；Q is vent flow, and unit is
m3/s；B is sluicing width, and taking internal diameter for first layer draining window is 4.1m, i.e. a length of 12.88m of inner circumferential, interior perimeter subtracts again
The width 3.2m of 8 columns, then the water width of crossing for having stud is 9.68m, so sluicing width B takes 9.68m；G attaches most importance to
Power acceleration, g=9.8m/s2；H is weir head, subtracts 1162 calculating, unit m with reservoir level to newly-built draining shaft.
The beneficial effects of the present invention are:
1, the present invention is by determining that the curve and window of weir head and vent flow go out stream mode to accurately reflect window
The relationship of integrated flow rate coefficient corresponding to weir head and vent flow.
2, the present invention is analyzed by flooding degree influence to collar tie beam difference, and can offer reference method for Practical Project,
Promote the raising of window type draining derrick discharge coefficient measurement.
Detailed description of the invention
Fig. 1 is flow chart of the present invention；
Fig. 2 is that the newly-built draining shaft of the present invention drains window weir head and vent flow relational graph；
Fig. 3 is the newly-built 8 draining window weir heads of draining shaft first row of the present invention and draining window integrated flow rate system
Number relational graph；
Fig. 4 is that weir head of the present invention is lower than collar tie beam schematic diagram；
Fig. 5 is that weir head of the present invention reaches collar tie beam critical part schematic diagram；
Fig. 6 is that weir head of the present invention floods collar tie beam schematic diagram.
Specific embodiment
In the following with reference to the drawings and specific embodiments, the invention will be further described.
Embodiment 1: as shown in figures 1 to 6, a kind of window type drains derrick discharge coefficient measuring method, the method it is specific
Steps are as follows:
Step1, pass through practical draining shaft relevant parameter, newly-built draining shaft hydraulic model；
Step2, by testing, the head of draining window and vent flow are new to get arriving in practical draining shaft under different operating conditions
It builds in draining shaft hydraulic model and drains the head and vent flow of window；
This model test selects 7 operating condition of test to be tested altogether, and the corresponding letdown flow of each operating condition of test is shown in Table 1.
1 operating condition of test table of table
Step3, in newly-built draining shaft hydraulic model, determine draining window weir head and vent flow curve；
Such as Fig. 2；
Step4, according to draining window weir head and vent flow curved line relation, in various degree flood collar tie beam the case where
Under, determine the aerial drainage mode of newly-built draining shaft draining window；
Newly-built draining shaft drains window aerial drainage first in the form of free weir flow；
When just reaching collar tie beam critical part, window is drained with free hole manifold formula aerial drainage；
When flooding collar tie beam, window is drained with hole weir mixed form aerial drainage；Such as Fig. 4-6；
Step5, according to weir flow integrated flow rate coefficient formula solve in the case where drain window difference aerial drainage mode weir head and
Integrated flow rate coefficient corresponding to vent flow, so that it is right to obtain weir head and vent flow institute under draining window difference aerial drainage mode
The integrated flow rate coefficient range answered, such as Fig. 3.
In the step Step 5, the formula of weir flow integrated flow rate coefficient isM is the stream of weir flow in formula
Coefficient of discharge, including side are shunk, the discharge coefficient for the synthesis that velocity of approach head and other factors influence；Q is vent flow, and unit is
m3/s；B is sluicing width, and taking internal diameter for first layer draining window is 4.1m, i.e. a length of 12.88m of inner circumferential, interior perimeter subtracts again
The width 3.2m of 8 columns, then the water width of crossing for having stud is 9.68m, so sluicing width B takes 9.68m；G attaches most importance to
Power acceleration, g=9.8m/s2；H is weir head, subtracts 1162 calculating, unit m with reservoir level to newly-built draining shaft.
Table 2 creates draining shaft first row 8 draining window weir heads and drains the relationship of window integrated flow rate coefficient
| Head (m) | 0.25 | 0.75 | 1.25 | 1.75 | 2.50 | 3.00 | 3.50 |
| Discharge coefficient | 0.16 | 0.32 | 0.37 | 0.42 | 0.43 | 0.41 | 0.33 |
Embodiment 2: as shown in figures 1 to 6, a kind of window type drains derrick discharge coefficient measuring method, the method it is specific
Steps are as follows:
Step1, pass through practical draining shaft relevant parameter, newly-built draining shaft hydraulic model；
Step2, by testing, the head of draining window and vent flow are new to get arriving in practical draining shaft under different operating conditions
It builds in draining shaft hydraulic model and drains the head and vent flow of window；
This model test selects 7 operating condition of test to be tested altogether, and the corresponding letdown flow of each operating condition of test is shown in Table 3.
3 operating condition of test table of table
Step3, in newly-built draining shaft hydraulic model, determine draining window weir head and vent flow curve；
Such as Fig. 2；
Step4, according to draining window weir head and vent flow curved line relation, in various degree flood collar tie beam the case where
Under, determine the aerial drainage mode of newly-built draining shaft draining window；
Newly-built draining shaft drains window aerial drainage first in the form of free weir flow；
When just reaching collar tie beam critical part, window is drained with free hole manifold formula aerial drainage；
When flooding collar tie beam, window is drained with hole weir mixed form aerial drainage；Such as Fig. 4-6；
As shown in Figure 2 when newly-built 8 draining window aerial drainages of draining shaft first row, weir head is less than 2.5m, flow
When less than 81.68m3/s, first row window aerial drainage in the form of free weir flow；When weir head is greater than 2.5m, flow is greater than
When 81.68m3/s, the lower edge front end of crossbeam above first row window is first contacted close to the water flow of column, water level rises on weir
To 3m, when flow increases to 101.86m3/s, first row window starts aerial drainage with free hole manifold formula；When head is greater than 3m, flow
When greater than 101.86m3/s, second row window starts the aerial drainage in the form of free weir flow, and first row window is with free hole manifold formula
Aerial drainage, flow-shape is that mixing pattern aerial drainage is flowed in the free weir flow on upper layer and the free hole of lower layer at this time；When head be greater than 3.5m,
When flow is greater than 105.04m3/s, second row window starts the aerial drainage in the form of submerging coefficient, and first row window is to flood hole stream
Form aerial drainage, flow-shape is that mixing pattern aerial drainage is flowed in the submerging coefficient on upper layer and the hole of flooding of lower layer at this time.
Step5, according to weir flow integrated flow rate coefficient formula solve in the case where drain window difference aerial drainage mode weir head and
Integrated flow rate coefficient corresponding to vent flow, so that it is right to obtain weir head and vent flow institute under draining window difference aerial drainage mode
The integrated flow rate coefficient range answered；
Free discharge coefficient of weir flow as shown in Figure 3 changes between 0.16~0.43, and free hole stream discharge coefficient is 0.43
Change between~0.41, hole weir mixed traffic coefficient changes between 0.41~0.33.With increasing for weir head, comprehensive stream
Coefficient of discharge first increases, after reduced, this is because falling water flow mutually collides after weir head increases to certain numerical value, let out
It flows unsmooth, influences the discharge capacity on weir, similar flood is flowed out, therefore integrated flow rate coefficient is reduced.
In the step Step 5, the formula of weir flow integrated flow rate coefficient isM is the stream of weir flow in formula
Coefficient of discharge, including side are shunk, the discharge coefficient for the synthesis that velocity of approach head and other factors influence；Q is vent flow, and unit is
m3/s；B is sluicing width, and taking internal diameter for first layer draining window is 4.1m, i.e. a length of 12.88m of inner circumferential, interior perimeter subtracts again
The width 3.2m of 8 columns, then the water width of crossing for having stud is 9.68m, so sluicing width B takes 9.68m；G attaches most importance to
Power acceleration, g=9.8m/s2；H is weir head, subtracts 1162 calculating, unit m with reservoir level to newly-built draining shaft.
Table 4 creates draining shaft first row 8 draining window weir heads and drains the relationship of window integrated flow rate coefficient
| Head (m) | 0.25 | 0.75 | 1.25 | 1.75 | 2.50 | 3.00 | 3.50 |
| Discharge coefficient | 0.16 | 0.32 | 0.37 | 0.42 | 0.43 | 0.41 | 0.33 |
Specific embodiments of the present invention are explained in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned realities
Example is applied, it within the knowledge of a person skilled in the art, can also be without departing from the purpose of the present invention
Various changes can be made.
Claims (2)
1. a kind of window type drains derrick discharge coefficient measuring method, it is characterised in that: specific step is as follows for the method:
Step1, pass through practical draining shaft relevant parameter, newly-built draining shaft hydraulic model；
Step2, it is arranged by draining head and the vent flow of window in practical draining shaft under the different operating conditions of test to get to newly-built
The head and vent flow of window are drained in water vertical shaft hydraulic model；
Step3, in newly-built draining shaft hydraulic model, determine draining window weir head and vent flow curve；
Step4, according to draining window weir head and vent flow curved line relation, in various degree flood collar tie beam in the case where,
Determine the aerial drainage mode of newly-built draining shaft draining window；
Newly-built draining shaft drains window aerial drainage first in the form of free weir flow；
When just reaching collar tie beam critical part, window is drained with free hole manifold formula aerial drainage；
When flooding collar tie beam, window is drained with hole weir mixed form aerial drainage；
Step5, weir head and aerial drainage in the case where draining window difference aerial drainage mode are solved according to weir flow integrated flow rate coefficient formula
The corresponding integrated flow rate coefficient of amount, to obtain under draining window difference aerial drainage mode corresponding to weir head and vent flow
Integrated flow rate coefficient range.
2. window type according to claim 1 drains derrick discharge coefficient measuring method, it is characterised in that: the step
In Step 5, the formula of weir flow integrated flow rate coefficient isM is the discharge coefficient of weir flow in formula, including side is received
The discharge coefficient for the synthesis that contracting, velocity of approach head and other factors influence；Q is vent flow, unit m3/s；B is the width that sluices
Degree, taking internal diameter for first layer draining window is 4.1m, i.e. a length of 12.88m of inner circumferential, interior perimeter subtracts the width of 8 columns again
3.2m, then the water width of crossing for having stud is 9.68m, so sluicing width B takes 9.68m；G is acceleration of gravity, g=
9.8m/s2；H is weir head, subtracts 1162 calculating, unit m with reservoir level to newly-built draining shaft.
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| CN201811260068.8A CN109612694A (en) | 2018-10-26 | 2018-10-26 | A kind of window type draining derrick discharge coefficient measuring method |
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| CN201811260068.8A CN109612694A (en) | 2018-10-26 | 2018-10-26 | A kind of window type draining derrick discharge coefficient measuring method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112328952A (en) * | 2021-01-05 | 2021-02-05 | 矿冶科技集团有限公司 | Drainage well discharge flow calculation method and device and electronic equipment |
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| CN106939587A (en) * | 2017-04-24 | 2017-07-11 | 中国电建集团西北勘测设计研究院有限公司 | A kind of power station major river bed river closure construction method |
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2018
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|---|---|---|---|---|
| CN102296574A (en) * | 2011-07-04 | 2011-12-28 | 广西电力工业勘察设计研究院 | Element extension gate control and operation curve design and application thereof |
| CN103017834A (en) * | 2012-12-29 | 2013-04-03 | 大连理工大学 | Method for accurately detecting discharge by using opening degree of sluice radial gate of hydropower station |
| CN106228242A (en) * | 2016-07-28 | 2016-12-14 | 三峡大学 | A kind of high accuracy flood routing method based on optimized algorithm |
| CN106939587A (en) * | 2017-04-24 | 2017-07-11 | 中国电建集团西北勘测设计研究院有限公司 | A kind of power station major river bed river closure construction method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112328952A (en) * | 2021-01-05 | 2021-02-05 | 矿冶科技集团有限公司 | Drainage well discharge flow calculation method and device and electronic equipment |
| CN112328952B (en) * | 2021-01-05 | 2021-04-23 | 矿冶科技集团有限公司 | Drainage well discharge flow calculation method and device and electronic equipment |
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Application publication date: 20190412 |