CN108534843B - Single gate flow calibration method and device for open channel water delivery channel - Google Patents
Single gate flow calibration method and device for open channel water delivery channel Download PDFInfo
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- CN108534843B CN108534843B CN201810175872.XA CN201810175872A CN108534843B CN 108534843 B CN108534843 B CN 108534843B CN 201810175872 A CN201810175872 A CN 201810175872A CN 108534843 B CN108534843 B CN 108534843B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/002—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow wherein the flow is in an open channel
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/52—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring the height of the fluid level due to the lifting power of the fluid flow
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Abstract
The invention discloses a single gate flow rate calibration method and a single gate flow rate calibration device for an open channel water delivery channel, wherein the method comprises the following steps: 1) collecting related data of the overflowing flow of the gate and the corresponding gate opening and water head difference by using measuring equipment; 2) comparing the flow data in the measured data with the opening degree of the gate to obtain a ratio; 3) obtaining a certain passing gate flow and an upstream and downstream water head difference value delta z corresponding to the gate opening degree through upstream and downstream water depths; 4) establishing a flow rate formula, using a mathematical regression analysis method to rate A, B, C three parameters in the formula according to the measured data, and determining a final CAP model; 5) and (3) substituting the difference value delta z of the upstream and downstream water heads and the gate opening e into the obtained CAP model to calculate the corresponding passing gate flow Q. The gate passing flow calculated by the method has higher precision, and the method is easy to realize.
Description
Technical Field
The invention relates to a water conservancy project management technology, in particular to a single gate flow calibration method and a single gate flow calibration device for an open channel water delivery channel.
Background
The water resource in China has the problem of uneven space-time distribution, and the overall expression is that the south is more, the north is less, and the summer is more, and the winter is less. With the development of economy, the contradiction of water resources is increasingly prominent. In order to solve the problem of uneven spatial distribution of water resources, China builds a plurality of large water transfer projects. The projects promote the reasonable allocation of water resources in China, strengthen the coordinated development among regions and generate great economic and social benefits.
For the operation management of water transfer projects, a gate dispatching system is the core of the water transfer project. The important premise for the exertion of the functions of the dispatching system is the accuracy of the relationship between the flow rate and the opening degree of the gate. The flow passing form of the gate can be generally divided into three types: the weir flow, the gate hole freely flow out, and the gate hole submerges and flows out. The majority of engineering gates generally have only one type of flow pattern. The traditional flow calculation formula of the free outflow and the submerged outflow of the gate hole is as follows:
in the formula:
mu is the flow coefficient of the free outflow or the submerged outflow of the gate;
e is the gate opening;
b is the gate width;
H0is the pre-gate total head.
The flow coefficient mu in the formula is related to the gate opening factor, so the accuracy of the calibration result is not high, and the over-gate flow calculated by the formula has a large error with the measured flow. This causes water loss or insufficient water delivery in the water transfer process, which seriously affects the normal water transfer of the project.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method and a device for calibrating the flow of a single gate of an open channel water delivery channel aiming at the defects in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a single gate flow rate calibration method for an open channel water delivery channel comprises the following steps:
1) collecting related data of the overflowing flow of the gate and the corresponding gate opening and water head difference by using measuring equipment;
2) comparing the flow data in the measured data with the opening degree of the gate to obtain a ratio Q/e, wherein Q is collected gate over-flow data; e is corresponding gate opening data;
3) obtaining a certain passing gate flow and an upstream and downstream water head difference value delta z corresponding to the gate opening degree through upstream and downstream water depths;
4) establishing a flow rate formula, using a mathematical regression analysis method to rate A, B, C three parameters in the formula according to the measured data, and determining a final CAP model; the formula is as follows:
wherein, A, B and C are parameters to be calibrated;
5) the difference value delta z of the upstream and downstream water heads and the gate opening e are actually measured and are brought into the obtained CAP model, and the corresponding passing gate flow Q is calculated;
6) and taking values of the upstream and downstream water level difference value delta z and the gate opening e within a certain range, calculating according to a CAP model, and tabulating calculation results to obtain a relational table of the upstream and downstream water level difference value delta z, the gate opening e and the passing gate flow Q.
A single gate flow rating device for an open channel water delivery channel comprising:
the device comprises an actual measurement data acquisition device, a measurement device and a control device, wherein the actual measurement data acquisition device is used for acquiring relevant actual measurement data of the overflowing flow of the gate, the gate opening and the water head difference corresponding to the overflowing flow of the gate, and the actual measurement data comprises the overflowing flow of the gate, the gate opening and the corresponding upstream and downstream water head differences;
the parameter calibration device is used for calibrating A, B, C three parameters in the formula by a mathematical regression analysis method according to the measured data to determine a final CAP model; the formula is as follows:
wherein, A, B and C are parameters to be calibrated;
the flow determining device is used for substituting the difference value delta z of the upstream and downstream water heads and the gate opening e into the obtained CAP model through actual measurement, and calculating the corresponding passing gate flow Q;
the flow input device is used for inputting the actual required brake flow of the gate;
and the flow control device is used for obtaining the actual required passing gate flow of the gate according to the flow input device and introducing the front and rear gate water head difference obtained by the sensor into the CAP model to obtain the corresponding gate opening, and outputting a control command to the gate control device to adjust the gate to a proper opening, so that the accurate passing gate flow is obtained.
The invention has the following beneficial effects: 1) the gate passing flow calculated by the method has higher precision; 2) with the increase of the measured data, the method can obtain more accurate parameters by calibration, and the flow obtained by the model of the method can be more accurate; 3) the invention has simple model and is easy to realize in engineering.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a flow chart of a method of an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, a method for calibrating the flow rate of a single gate in an open channel water delivery channel, which comprises a section of open channel water delivery channel, wherein a gate is arranged on the channel, comprises the following steps:
1) collecting relevant measured data of the overflowing flow of the gate and the corresponding gate opening and water head difference by using measuring equipment; the measured data comprises the passing gate flow rate and the opening degree of the gate and the corresponding upstream and downstream water head difference;
2) comparing the flow data in the measured data with the opening degree of the gate to obtain a ratio Q/e, wherein Q is collected gate over-flow data; e is corresponding gate opening data;
3) obtaining a certain passing gate flow and an upstream and downstream water head difference value delta z corresponding to the gate opening degree through upstream and downstream water depths;
4) establishing a flow rate formula, using a mathematical regression analysis method to rate A, B, C three parameters in the formula according to the measured data, and determining a final CAP model; the formula is as follows:
wherein, A, B and C are parameters to be calibrated;
5) the difference value delta z of the upstream and downstream water heads and the gate opening e are actually measured and are brought into the obtained CAP model, and the corresponding passing gate flow Q is calculated;
6) and taking values of the upstream and downstream water level difference value delta z and the gate opening e within a certain range, calculating according to a CAP model, and tabulating calculation results to obtain a relational table of the upstream and downstream water level difference value delta z, the gate opening e and the passing gate flow Q.
A single gate flow rating device for an open channel water delivery channel comprising:
the device comprises an actual measurement data acquisition device, a measurement device and a control device, wherein the actual measurement data acquisition device is used for acquiring relevant actual measurement data of the overflowing flow of the gate, the gate opening and the water head difference corresponding to the overflowing flow of the gate, and the actual measurement data comprises the overflowing flow of the gate, the gate opening and the corresponding upstream and downstream water head differences;
the parameter calibration device is used for calibrating A, B, C three parameters in the formula by a mathematical regression analysis method according to the measured data to determine a final CAP model; the formula is as follows:
wherein, A, B and C are parameters to be calibrated; Δ z is the difference between the upstream and downstream water heads (upstream water depth-downstream water depth);
the flow determining device is used for substituting the difference value delta z of the upstream and downstream water heads and the gate opening e into the obtained CAP model through actual measurement, and calculating the corresponding passing gate flow Q;
the flow input device is used for inputting the actual required brake flow of the gate;
and the flow control device is used for obtaining the actual required passing gate flow of the gate according to the flow input device and introducing the front and rear gate water head difference obtained by the sensor into the CAP model to obtain the corresponding gate opening, and outputting a control command to the gate control device to adjust the gate to a proper opening, so that the accurate passing gate flow is obtained.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (2)
1. A single gate flow rate calibration method for an open channel water delivery channel is characterized by comprising the following steps:
1) collecting related data of the overflowing flow of the gate and the corresponding gate opening and water head difference by using measuring equipment;
2) comparing the flow data in the measured data with the opening degree of the gate to obtain a ratio Q/e, wherein Q is collected gate over-flow data; e is corresponding gate opening data;
3) obtaining a certain passing gate flow and an upstream and downstream water head difference value delta z corresponding to the gate opening degree through upstream and downstream water depths;
4) establishing a flow rate formula, using a mathematical regression analysis method to rate A, B, C three parameters in the formula according to the measured data, and determining a final CAP model; the formula is as follows:
wherein, A, B and C are parameters to be calibrated;
5) the difference value delta z of the upstream and downstream water heads and the gate opening e are actually measured and are brought into the obtained CAP model, and the corresponding passing gate flow Q is calculated;
6) and taking values of the upstream and downstream water level difference value delta z and the gate opening e within a certain range, calculating according to a CAP model, and tabulating calculation results to obtain a relational table of the upstream and downstream water level difference value delta z, the gate opening e and the passing gate flow Q.
2. The utility model provides a single gate flow rate rating device of open channel water delivery channel which characterized in that includes:
the device comprises an actual measurement data acquisition device, a measurement device and a control device, wherein the actual measurement data acquisition device is used for acquiring relevant actual measurement data of the overflowing flow of the gate, the gate opening and the water head difference corresponding to the overflowing flow of the gate, and the actual measurement data comprises the overflowing flow of the gate, the gate opening and the corresponding upstream and downstream water head differences;
the parameter calibration device is used for calibrating A, B, C three parameters in the formula by a mathematical regression analysis method according to the measured data to determine a final CAP model; the formula is as follows:
wherein, A, B and C are parameters to be calibrated;
the flow determining device is used for substituting the difference value delta z of the upstream and downstream water heads and the gate opening e into the obtained CAP model through actual measurement, and calculating the corresponding passing gate flow Q;
the flow input device is used for inputting the actual required brake flow of the gate;
and the flow control device is used for obtaining the actual required passing gate flow of the gate according to the flow input device and introducing the front and rear gate water head difference obtained by the sensor into the CAP model to obtain the corresponding gate opening, and outputting a control command to the gate control device to adjust the gate to a proper opening, so that the accurate passing gate flow is obtained.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109241690B (en) * | 2018-11-12 | 2023-01-03 | 扬州大学 | CFD-based sluice over-current flow calculation method |
| CN110197030B (en) * | 2019-05-29 | 2020-08-21 | 中国水利水电科学研究院 | Regulating and controlling method for controlling brake flooding outflow |
| CN112301962B (en) * | 2020-10-21 | 2021-12-17 | 长江勘测规划设计研究有限责任公司 | Method for improving flow capacity of large diversion project without affecting normal water supply |
| CN113343595B (en) * | 2021-05-21 | 2022-03-04 | 武汉大学 | Inversion model of open channel water delivery system accident and method for determining accident flow and position |
| CN113642081A (en) * | 2021-08-23 | 2021-11-12 | 武汉量水科技有限公司 | Calibration method for simple gate water measurement |
| CN113739879B (en) * | 2021-10-14 | 2024-03-26 | 四创科技有限公司 | Method and terminal for measuring water rate of open channel |
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| JP2009216712A (en) * | 2009-05-12 | 2009-09-24 | Panasonic Corp | Flow measuring device and flow measuring method |
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| CN103292873A (en) * | 2013-05-28 | 2013-09-11 | 广东省水利水电科学研究院 | Water taking metering and calibrating method |
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| CN1530638A (en) * | 2003-03-13 | 2004-09-22 | 山东农业大学 | Method and device for monitornig and accumulating continuous uniform flow in open channel |
| JP2005326330A (en) * | 2004-05-17 | 2005-11-24 | Toyo Kensa Kogyo Kk | Automatic flow rate measuring device and automatic flow rate measuring method of sending/distributing water pipe |
| JP2009216712A (en) * | 2009-05-12 | 2009-09-24 | Panasonic Corp | Flow measuring device and flow measuring method |
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