Method, system, device, and medium for measuring flow rate of non-full pipe flow in a circular pipe

Abstract

This invention discloses a method, system, equipment, and medium for measuring the flow rate of a non-full-pipe flow in a circular pipe. The method includes the following steps: setting a gate at the outlet of a sloping circular pipe; acquiring initial water flow depth and pipe diameter data within the circular pipe; closing the gate within a preset time, causing the water flow to form an upstream propagating surge within the circular pipe, and the surge being a non-full-pipe flow; acquiring the surge velocity at a preset distance from the gate and the water depth at the gate after the surge propagates; and calculating the flow rate using a flow rate calculation formula based on the initial water flow depth, pipe diameter data, surge velocity at the preset distance from the gate, and water depth at the gate after the surge propagates. This application utilizes the propagation characteristics of the surge to measure the flow rate, which can protect the integrity of the pipe, eliminates the need for periodic maintenance of equipment installed inside the pipe, simplifies the measurement method, and provides accurate results, thus possessing significant practical value.

Description

Technical Field

[0001] This invention relates to the field of water flow measurement technology, and in particular to methods, systems, equipment and media for measuring non-full-pipe flow in circular pipes. Background Technology

[0002] Currently, flow measurement and monitoring are widely used in urban stormwater drainage systems for stormwater management. By measuring flow rates in wastewater systems, pollutant loads can be estimated, enabling effective wastewater treatment. Furthermore, analyzing flow rates in pipes can identify problems including siltation, overload, overflow, and abnormal seepage. In intelligent drainage systems, flow measurement is a crucial aspect of providing data for effective decision-making.

[0003] Several methods exist for measuring flow rate, primarily based on direct flow assessment (e.g., venturi tubes, electromagnetic flowmeters, and other measuring devices) or velocity observation. Extensive research has demonstrated that flow rate can be well measured using measuring structures such as flumes, orifices, and weirs in circular pipes. While these methods are effective for flow rate measurement, the wall curvature of orifices or flumes in pipes can affect the upstream flow regime, thus influencing the flow rate measurement results. Furthermore, silt and debris deposition upstream of weirs reduces the accuracy of such devices, and these structures can also damage the pipe structure to some extent, affecting its lifespan and leading to frequent and costly maintenance. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and to propose a method, system, equipment, and medium for measuring the flow rate of non-full flow in a circular pipe, thereby solving the technical problems of low measurement accuracy, damage to pipe structure, and high maintenance costs in the long-term use of flow measurement in the prior art.

[0005] To achieve the above-mentioned technical objectives, in a first aspect, the present invention provides a method for measuring the flow rate of a non-full-pipe flow in a circular pipe, comprising the following steps:

[0006] A gate is installed at the outlet of a sloping circular pipe to obtain the initial water flow depth y1 and pipe diameter data D inside the circular pipe;

[0007] After the gate is closed within a preset time, the water flow forms a surge wave that propagates upstream within the circular pipe. This surge wave is not a full-pipe flow. The surge wave velocity V at a preset distance from the gate is obtained. w The water depth at the gate after the propagation of the surge is y2;

[0008] Based on the initial water flow depth y1, pipe diameter data D, and surge velocity V at a preset distance from the gate. w After the surge propagates, the water depth y2 at the gate is used to calculate the water flow rate using the flow rate calculation formula:

[0009]

[0010] Compared with the prior art, the beneficial effects of the method for measuring non-full-pipe flow in a circular pipe provided by the present invention include:

[0011] The method for measuring non-full-flow in a circular pipe provided by this invention utilizes the propagation characteristics of swells after they are generated, i.e., the initial water depth, swell depth, swell velocity, and pipe diameter, to calculate the flow rate. There are no extra parameters, no need to consider pipe slope, the calculation is simple, and the error is small. Furthermore, it protects the integrity of the pipe, does not require damaging the pipe to install other instruments, and eliminates the need for regular maintenance of equipment installed inside the pipe. The measurement method is simple, the measurement results are accurate, and it has good practical value.

[0012] According to some embodiments of the present invention, the water flow rate is calculated, including the following steps:

[0013] Obtain the flow area and average velocity of the initial water flow, the flow area and average velocity of the swell at the second cross section, which is a preset distance from the gate. Obtain the distance from the centroid of the first cross section to the bottom of the pipe and the distance from the centroid of the second cross section to the bottom of the pipe.

[0014] According to the continuity equation: A1(V1+V w )=A2(V2+V w )

[0015] Momentum equation: ρ(V1+V w A1(V1-V2)=ρg(y c2 A2-y c1 A1)

[0016] Wherein, the initial flow area is A1, the initial average flow velocity is V1, the second cross-section has a flow area of ​​A2, the second cross-section has an average flow velocity of V2, and the swell velocity is V. w ρ is the density of water, g is the acceleration due to gravity, and y is the distance from the centroid of the first cross-section to the bottom of the pipe. c1 The distance from the centroid of the second section to the bottom of the pipe is y. c2 ;

[0017] get

[0018] Introduce the calculation factor A = (y / D) 1.5 D 2 and y c A = 0.5D 3 (y / D) 2.5 ,get

[0019]

[0020] According to some embodiments of the present invention, the first water flow rate is measured by an electromagnetic flowmeter and used as the abscissa to select the swell velocity V. w The measurement location is used as the ordinate to calculate the second water flow rate using the flow rate calculation formula;

[0021] A coordinate graph is generated based on the first water flow rate and the second water flow rate;

[0022] Determine the measurement error at the current measurement location, and select a measurement location where the measurement error is lower than a preset error value to measure the surge velocity V. w Measurement.

[0023] According to some embodiments of the present invention, the measurement position where the measurement error is lower than the preset error value is a position 20 to 27 times the pipe diameter upstream of the gate.

[0024] According to some embodiments of the present invention, the preset error value is 10%.

[0025] According to some embodiments of the present invention, the slope value of the circular pipe ranges from 0 to 0.006.

[0026] Secondly, the technical solution of the present invention provides a system for measuring the flow rate of non-full flow in a circular pipe, comprising:

[0027] The data acquisition module is used to acquire the initial water flow depth y1 and pipe diameter D within the circular pipe. After the gate is closed within a preset time, the water flow forms an upstream swell within the circular pipe, and the swell is not a full-pipe flow. The module acquires the swell velocity V at a preset distance from the gate. w The water depth at the gate after the propagation of the surge is y2;

[0028] The flow calculation module, which is communicatively connected to the data acquisition module, is used to calculate the flow rate based on the initial water flow depth y1, the pipe diameter data D, and the surge velocity V at a preset distance from the gate. w After the surge propagates, the water depth y2 at the gate is used to calculate the water flow rate using the flow rate calculation formula:

[0029]

[0030] According to some embodiments of the present invention, it further includes:

[0031] A measurement location selection module, communicatively connected to the data acquisition module, includes:

[0032] The coordinate graph generation unit uses the first water flow rate measured by an electromagnetic flowmeter as the horizontal axis and selects the surging velocity V. wThe measurement location is used to calculate the second water flow rate using the flow rate calculation formula, and a coordinate graph is generated based on the first water flow rate and the second water flow rate.

[0033] The position selection unit determines the measurement error at the current measurement position and selects a measurement position with a measurement error lower than a preset error value to measure the surge velocity V. w Measurement.

[0034] Thirdly, the present invention provides an electronic device, including a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the method for measuring non-full flow in a circular pipe as described in any of the first aspects.

[0035] Fourthly, the present invention provides a readable storage medium, characterized in that a program or instructions are stored on the readable storage medium, and when the program or instructions are executed by a processor, the method for measuring the flow rate of a non-full pipe in a circular pipe as described in any of the first aspects is implemented.

[0036] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0037] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein the abstract drawings are to be completely consistent with one of the drawings in the specification:

[0038] Figure 1 A flowchart illustrating a method for measuring non-full-flow rate in a circular pipe according to an embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram illustrating a method for measuring non-full-flow rate in a circular pipe according to an embodiment of the present invention.

[0040] Figure 3 A flowchart illustrating a method for measuring non-full-flow rate in a circular pipe according to an embodiment of the present invention;

[0041] Figure 4 This is a measurement error coordinate diagram of a method for measuring non-full-pipe flow in a circular pipe according to an embodiment of the present invention. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0043] It should be noted that although functional modules are divided in the system diagram and the logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than the module division in the system or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, and the aforementioned figures are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0044] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0045] Reference Figures 1 to 2 , Figure 1 A flowchart illustrating a method for measuring non-full-flow rate in a circular pipe according to an embodiment of the present invention; Figure 2 This is a schematic diagram illustrating a method for measuring the flow rate of a non-full-pipe flow in a circular pipe according to an embodiment of the present invention. The method for measuring the flow rate of a non-full-pipe flow in a circular pipe includes, but is not limited to, steps S110 to S130.

[0046] Step S110: Set a gate at the outlet of the sloping circular pipe to obtain the initial water flow depth and pipe diameter data inside the circular pipe;

[0047] Step S120: After the gate is closed within a preset time, the water flow forms a surge wave that propagates upstream in the circular pipe, and the surge wave is not a full pipe flow. The surge wave velocity at a preset distance from the gate and the water depth at the gate after the surge wave propagates are obtained.

[0048] Step S130: Based on the initial water flow depth, pipe diameter data, surge velocity at a preset distance from the gate, and water depth at the gate after surge propagation, the water flow rate is calculated using the flow rate calculation formula.

[0049] In one embodiment, a method for measuring the non-full-pipe flow rate in a circular pipe includes the steps of: setting a gate at the outlet of a sloping circular pipe; acquiring the initial water flow depth y1 and pipe diameter D within the circular pipe; closing the gate within a preset time, causing the water flow to form an upstream propagating surge within the circular pipe, and the surge being a non-full-pipe flow; and acquiring the surge velocity V at a preset distance from the gate. w The water depth y2 at the gate after the surge propagates; based on the initial water flow depth y1, pipe diameter data D, and surge velocity V at a preset distance from the gate. wAfter the surge propagates, the water depth y2 at the gate is used to calculate the water flow rate using the flow rate calculation formula:

[0050]

[0051] This method is proposed by utilizing the continuity equation and momentum equation, combined with the change in the flow area of ​​a non-full-pipe flow in a circular pipe. Experimental verification shows that the maximum error is 10.5% in a horizontal pipe. The following assumptions were made in the analysis: 1. The water flow is assumed to be quasi-steady-state; 2. The hydrostatic pressure distribution is assumed.

[0052] A gate is installed at the outlet of a circular pipe with a slope of θ. Figure 2 (III-III) After the gate is quickly closed, a surge is formed in the pipeline and reaches a speed of V. w The wave propagates upstream (the positive x-direction points upstream), where the initial water depth is y1, the swell depth is y2, and the swell propagates a distance L from the gate. x .

[0053] Continuity equation and momentum equation:

[0054] Continuity equation: A1(V1+V w )=A2(V2+V w (1)

[0055] Momentum equation: ρ(V1+V w A1(V1-V2)=ρg(y c2 A2-y c1 A1) (2) Where A1 and V1 are the flow area and average velocity of the initial water flow, respectively, and A2 and V2 are the flow area and average velocity of the swell at section II-II, respectively. ρ is the density of water, g is the acceleration due to gravity, and y c1 y c2 The first section ( Figure 2 Middle II), Second Section ( Figure 2 The distance from the centroid of (II-II) to the bottom of the pipe is used to derive the flow rate calculation formula from equations 1 and 2:

[0056]

[0057] To simplify the calculation, a calculation factor is introduced (Hager, 2010; Hager, WH, 2010. Wastewater Hydraulics. Springer Berlin, Heidelberg, Berlin, Heidelberg. https: / / doi.org / 10.1007 / 978-3-642-11383-3): A = (y / D) 1.5 D2 and y c A = 0.5D 3 (y / D) 2.5 The following results were obtained:

[0058]

[0059] Equation 4 is the formula for the final flow rate calculation. In a pipe of known diameter, the flow rate calculation for non-full-flow is determined solely by y1, y2, and V. w To determine.

[0060] This application involves installing a gate at the outlet of a sloping circular pipe. First, the initial water flow depth y1 and pipe diameter D within the circular pipe are acquired. After closing the gate within a preset time, it is generally necessary to close it quickly, causing the water flow to form an upstream surge within the circular pipe. This surge is not a full-pipe flow. The surge velocity V at a preset distance from the gate is then acquired. w The water depth y2 at the gate after the surge propagates; based on the initial water flow depth y1, pipe diameter data D, and surge velocity V at a preset distance from the gate. w The water flow rate is calculated using the flow rate calculation formula, based on the water depth y2 at the gate after the surge propagates. This embodiment utilizes the propagation characteristics of the surge after its generation, namely the initial water depth, surge water depth, surge velocity, and pipe diameter, to measure the flow rate. A flow rate calculation formula is proposed based on the continuity equation and momentum equation, combined with the change in the flow area of ​​a circular pipe during non-full-pipe flow. The water flow rate can then be calculated using this formula.

[0061] The method for measuring non-full-flow in a circular pipe provided in this application has the advantages of requiring few parameters, not needing to consider pipe slope, simple calculation, and small measurement error. Because this application does not require installing the measuring device inside the pipe, it protects the integrity of the pipe, avoids damaging the pipe to install other instruments, does not affect the pipe's service life, requires no maintenance of the measuring equipment, has low operating costs, and has excellent practical value.

[0062] Furthermore, the water flow rate is calculated, including the following steps:

[0063] Obtain the flow area and average velocity of the initial water flow, the flow area and average velocity of the swell at the second cross section, which is a preset distance from the gate. Obtain the distance from the centroid of the first cross section to the bottom of the pipe and the distance from the centroid of the second cross section to the bottom of the pipe.

[0064] According to the continuity equation: A1(V1+V w )=A2(V2+V w )

[0065] Momentum equation: ρ(V1+Vw A1(V1-V2)=ρg(y c2 A2-y c1 A1)

[0066] Wherein, the initial flow area is A1, the initial average flow velocity is V1, the second cross-section has a flow area of ​​A2, the second cross-section has an average flow velocity of V2, and the swell velocity is V. w ρ is the density of water, g is the acceleration due to gravity, and y is the distance from the centroid of the first cross-section to the bottom of the pipe. c1 The distance from the centroid of the second section to the bottom of the pipe is y. c2 ;

[0067] get

[0068] Introduce the calculation factor A = (y / D) 1.5 D 2 and y c A = 0.5D 3 (y / D) 2.5 ,get

[0069]

[0070] Reference Figure 3 and Figure 4 , Figure 3 A flowchart illustrating a method for measuring non-full-flow rate in a circular pipe according to an embodiment of the present invention; Figure 4 This is a measurement error coordinate graph of a method for measuring the flow rate of a non-full-pipe flow in a circular pipe according to an embodiment of the present invention. The method for measuring the flow rate of a non-full-pipe flow in a circular pipe includes, but is not limited to, steps S210 to S230.

[0071] Step S210: Measure the first water flow rate using an electromagnetic flowmeter as the horizontal axis, select the measurement location for the surge velocity, and calculate the second water flow rate using the flow calculation formula as the vertical axis.

[0072] Step S220: Generate a coordinate graph based on the first water flow rate and the second water flow rate;

[0073] Step S230: Determine the measurement error at the current measurement position, and select a measurement position with a measurement error lower than the preset error value to measure the surge velocity.

[0074] In one embodiment, a method for measuring the non-full-pipe flow rate in a circular pipe includes the steps of: setting a gate at the outlet of a sloping circular pipe; acquiring the initial water flow depth y1 and pipe diameter D within the circular pipe; closing the gate within a preset time, causing the water flow to form an upstream propagating surge within the circular pipe, and the surge being a non-full-pipe flow; and acquiring the surge velocity V at a preset distance from the gate. w The water depth y2 at the gate after the surge propagates; based on the initial water flow depth y1, pipe diameter data D, and surge velocity V at a preset distance from the gate. w After the surge propagates, the water depth y2 at the gate is used to calculate the water flow rate using the flow rate calculation formula:

[0075]

[0076] The flow rate of the first water flow is measured by an electromagnetic flowmeter and used as the horizontal axis, with the swell velocity V selected. w The measurement location is determined, and the second water flow rate is calculated using the flow rate calculation formula as the vertical axis; a coordinate graph is generated based on the first and second water flow rates; the measurement error at the current measurement location is determined, and a measurement location with a measurement error lower than a preset error value is selected for the surge velocity V. w Measurement.

[0077] For the surge velocity V w Since its propagation process is variable, the applicable measurement V for Equation 4 was determined through laboratory experiments and verification in a large-scale pipeline. w Location. Minimum measurement V is recommended. w The position is 10λ (λ = A1 / b1, where b1 is the initial water surface width), and the largest measurement position in the large-scale model is 27D (D is the pipe diameter). The calculation error is as follows: Figure 4 As shown:

[0078] Figure 4 The results are all dimensionless numbers, Q * Q represents the flow rate measured by the electromagnetic flowmeter in the experiment. c * The flow rate is calculated using Equation 4. Figure 4 (a) to (c) are the V values ​​measured at points 7, 9, and 10λ in a pipe with a diameter D = 0.2 m. w Comparison of results after substituting into Equation 4, where i is the pipe slope; (d) is the verification result in the pipe of the large-scale model (D = 0.3m), with V measured at positions 20 and 27D respectively. w The error is within 9.4%.

[0079] In one embodiment, the system for measuring the non-full-pipe flow rate in a circular pipe includes: a data acquisition module, used to acquire the initial water flow depth y1 and pipe diameter data D in the circular pipe; after the gate is closed within a preset time, the water flow forms an upstream propagating surge in the circular pipe, and the surge is a non-full-pipe flow; and to acquire the surge velocity V at a preset distance from the gate. w The initial water depth y2 at the gate after wave propagation; the flow rate calculation module, which is communicatively connected to the data acquisition module, is used to calculate the initial water depth y1, the pipe diameter data D, and the wave velocity V at a preset distance from the gate. w After the surge propagates, the water depth y2 at the gate is used to calculate the water flow rate using the flow rate calculation formula:

[0080]

[0081] Furthermore, the system for measuring the flow rate of non-full-pipe flow in a circular pipe also includes: a measurement location selection module, communicatively connected to the data acquisition module, comprising: a coordinate graph generation unit, which uses the first water flow rate measured by an electromagnetic flowmeter as the abscissa and selects the surge velocity V. w The measurement location is determined, and the second water flow rate is calculated using the flow rate calculation formula as the vertical axis. A coordinate graph is generated based on the first water flow rate and the second water flow rate. The location selection unit determines the measurement error of the current measurement location and selects a measurement location with a measurement error lower than a preset error value for the surge velocity V. w Measurement.

[0082] The present invention also provides an electronic device, including a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the method for measuring non-full flow in a circular pipe as described above.

[0083] The processor and memory can be connected via a bus or other means.

[0084] Memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory may optionally include memory remotely located relative to the processor, and these remote memories can be connected to the processor via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0085] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0086] Furthermore, one embodiment of the present invention provides a computer-readable storage medium storing computer-executable instructions that are executed by a processor or controller, for example, by a processor in the above-described terminal embodiment, such that the processor performs the method for measuring the flow rate of a non-full pipe in the above-described circular pipe.

[0087] Those skilled in the art will understand that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information transmission medium.

[0088] The above is a detailed description of the preferred embodiments of the present invention. However, the present invention is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of the present invention.

[0089] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for measuring the flow rate of a non-full-pipe flow in a circular pipe, characterized in that, Includes the following steps: A gate is installed at the outlet of a sloping circular pipe to obtain the initial water flow depth within the pipe. and pipe diameter data ; After the gate is closed within a preset time, the water flow forms a surge wave that propagates upstream within the circular pipe. This surge wave is not a full-pipe flow. The surge wave velocity at a preset distance from the gate is obtained. Water depth at the gate after wave propagation ; Based on the initial water flow depth Pipe diameter data surge velocity at a preset distance from the gate Water depth at the gate after wave propagation The water flow rate is calculated using the flow rate calculation formula. The calculation of water flow rate includes the following steps: Obtain the flow area and average velocity of the initial water flow, the flow area and average velocity of the swell at the second cross section, which is a preset distance from the gate. Obtain the distance from the centroid of the first cross section to the bottom of the pipe and the distance from the centroid of the second cross section to the bottom of the pipe. According to the continuity equation: ; Momentum equation: ; The initial flow area is... The initial average flow velocity is The flow area of ​​the second section is The average flow velocity at the second cross section is The speed of the surging waves is , The density of water, The acceleration due to gravity is the distance from the centroid of the first cross-section to the bottom of the pipe. The distance from the centroid of the second section to the bottom of the pipe is ; get ; Introducing calculation factors and ,get ； The swell velocity is selected by using the first water flow rate measured by an electromagnetic flowmeter as the horizontal axis. The measurement location is used as the ordinate to calculate the second water flow rate using the flow rate calculation formula; A coordinate graph is generated based on the first water flow rate and the second water flow rate; Determine the measurement error at the current measurement location, and select a measurement location with a measurement error lower than a preset error value to measure the surge velocity. Measurement.

2. The method for measuring non-full-flow rate in a circular pipe according to claim 1, characterized in that, The measurement location with a measurement error lower than the preset error value is 20 to 27 times the pipe diameter upstream of the gate.

3. The method for measuring non-full-pipe flow rate in a circular pipe according to claim 1, characterized in that, The preset error value is 10%.

4. The method for measuring non-full-flow rate in a circular pipe according to claim 1, characterized in that, The slope of the circular pipe ranges from 0 to 0.

006.

5. A system for measuring the flow rate of non-full-flow in a circular pipe, characterized in that, The method for measuring non-full-flow rate in a circular pipe as described in any one of claims 1-4 includes: The data acquisition module is used to acquire the initial water flow depth inside the circular pipe. and pipe diameter data After the gate is closed within a preset time, the water flow forms a surge that propagates upstream within the circular pipe. This surge is not a full-pipe flow. The surge velocity at a preset distance from the gate is obtained. Water depth at the gate after wave propagation ; The flow calculation module, which is communicatively connected to the data acquisition module, is used to calculate the flow rate based on the initial water flow depth. Pipe diameter data surge velocity at a preset distance from the gate Water depth at the gate after wave propagation The water flow rate is calculated using the flow rate calculation formula: 。 6. The system for measuring the flow rate of non-full-flow in a circular pipe according to claim 5, characterized in that, Also includes: A measurement location selection module, communicatively connected to the data acquisition module, includes: The coordinate graph generation unit uses the first water flow rate measured by an electromagnetic flowmeter as the horizontal axis and selects the surging velocity. The measurement location is used to calculate the second water flow rate using the flow rate calculation formula, and a coordinate graph is generated based on the first water flow rate and the second water flow rate. The location selection unit determines the measurement error at the current measurement location and selects a measurement location with a measurement error lower than a preset error value to measure the surge velocity. Measurement.

7. An electronic device, characterized in that, It includes a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the method for measuring non-full-flow in a circular pipe as described in any one of claims 1-4.

8. A readable storage medium, characterized in that, The readable storage medium stores a program or instructions that, when executed by a processor, implement the method for measuring non-full-flow rate in a circular pipe as described in any one of claims 1-4.

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