Method and apparatus for measuring a multi-channel ultrasonic gas flowmeter, electronic device

Abstract

The disclosure provides a measurement method of a multi-channel ultrasonic gas flowmeter, the measurement method comprising: arranging transducer positions of the ultrasonic flowmeter according to quadrature nodes with a node number of 5, wherein the node numbers 2, 3 and 5 correspond to a first channel, a second channel and a third channel respectively; calculating a face velocity of a gas in a pipeline to be measured and a velocity difference between the second channel and the third channel; performing a control experiment in the same environment as the pipeline to be measured, performing an experiment on different inlet velocities and different pipe bottom dirt thicknesses of an ideal flow field by using the five-channel ultrasonic flowmeter, recording linear velocity values of the five channels, calculating the face velocity of the gas in the pipeline and the velocity difference between the third channel and the fifth channel; comparing the calculated face velocity and linear velocity difference with the control group to obtain a pipe bottom dirt thickness h, and calculating an instantaneous flow of the pipeline under the condition of the pipe bottom dirt thickness h.

Description

Technical Field

[0001] This disclosure relates to the field of multi-channel ultrasonic gas flow meter technology, and in particular to a measurement method, apparatus, electronic device, and computer-readable storage medium for a multi-channel ultrasonic gas flow meter. Background Technology

[0002] To improve safety and production efficiency, industries such as natural gas, petroleum, chemicals, and steam require a large number of online gas flow monitoring devices. Currently, traditional mechanical flow meters are commonly used, such as vortex, turbine, rotor, and venturi flow meters. Due to wear and tear on rotating mechanical parts, or contamination and corrosion of the sensor by the medium, the performance of these flow meters is prone to deterioration, generally requiring regular offline maintenance and annual inspections. Furthermore, their performance is significantly affected by parameters such as the temperature, pressure, viscosity, and density of the fluid being measured.

[0003] The pipe-segment time-of-flight ultrasonic gas flow meter is a more advanced gas measurement device. This type of flow meter has one or more pairs of ultrasonic sensors pre-installed on the pipe segment. Each pair of sensors is arranged at a certain distance upstream and downstream along the fluid flow direction. The fluid velocity is measured by measuring the time difference between the propagation of ultrasonic pulses in the downstream and upstream directions. The advantages of this technology are the absence of rotating parts, minimal maintenance, and high accuracy.

[0004] Traditional three-channel measurement methods include one channel located at the center and two symmetrical channels on either side. With prolonged use of the pipe, ice blockage and dirt often accumulate at the bottom of the pipe. The channels located near the center have low sensitivity to these conditions and cannot effectively eliminate the influence of dirt at the bottom of the pipe, resulting in reduced measurement accuracy. Summary of the Invention

[0005] In view of the above problems, this disclosure provides a measurement method, apparatus, electronic device, and computer-readable storage medium for a multi-channel ultrasonic gas flow meter.

[0006] According to a first aspect of this disclosure, a measurement method for a multi-channel ultrasonic gas flow meter is provided, comprising:

[0007] The transducer positions of the ultrasonic flow meter are arranged according to a quadrature node with a node number of 5, where the number of nodes 2, 3, and 5 correspond to the first channel, the second channel, and the third channel, respectively.

[0008] Calculate the surface velocity of the gas inside the pipe to be measured, including:

[0009]

[0010] Among them, W iv is the quadrature coefficient of the i-th channel. i Let be the linear average velocity of the i-th channel.

[0011] Calculate the speed difference between the second and third channels, including:

[0012]

[0013] in, v1 represents the difference in linear velocity between the second and third channels, v2 represents the linear velocity of the second channel, and v3 represents the linear velocity of the third channel.

[0014] A control experiment was conducted using the same environment as the pipe to be measured. A five-channel ultrasonic flowmeter was used to conduct experiments under different inlet velocities and different pipe bottom fouling thicknesses in an ideal flow field, recording the linear velocity values ​​v of the five channels. o1 v o2 v o3 v o4 v o5 Calculate the surface velocity of the gas inside the pipe. and the speed difference between the third and fifth channels The calculated surface velocity Difference with linear velocity Surface velocity obtained from the experiment with the control group and linear velocity difference The thickness h of the fouling at the bottom of the pipe was obtained by comparison; and

[0015] The instantaneous flow rate of the pipeline is calculated given the thickness h of the fouling at the bottom of the pipe, including:

[0016]

[0017] Where Q represents the instantaneous flow rate, K is the correction factor, and W... i Here, R is the quadrature coefficient for the corresponding audio channel, and X is the inner radius of the pipe. i For the quadrature node positions corresponding to the pipes, v1, v2, and v3 are the linear velocities of the first, second, and third audio channels, respectively. o1 The linear velocity of the first channel was measured as a control experiment.

[0018] According to some embodiments of this disclosure, the method for determining the linear velocity of the first channel, the second channel, and the third channel includes:

[0019]

[0020] Where L is the channel length, θ is the angle between the sound wave and the flow velocity, and t u t is the retrograde propagation time of the vocal tract. d This refers to the anterograde propagation time of the vocal tract.

[0021] According to some embodiments of this disclosure, the experiments conducted under different inlet velocities and different bottom fouling thicknesses in an ideal flow field further include:

[0022] v is obtained by fitting the recorded data. o1 v o2 v o3 v o4 v o5 , as well as

[0023] According to some embodiments of this disclosure, the positions of the three channels relative to the center are -0.538459310R, 0R, and 0.906179846R, respectively.

[0024] A second aspect of this disclosure provides a measuring device for a multi-channel ultrasonic gas flow meter, comprising:

[0025] The channel arrangement module is suitable for arranging the transducer positions of an ultrasonic flow meter according to a quadrature node with a node number of 5, wherein the number of nodes 2, 3, and 5 correspond to the first channel, the second channel, and the third channel, respectively.

[0026] The first calculation module calculates the surface velocity of the gas inside the pipe to be measured, including:

[0027]

[0028] Among them, W i v is the quadrature coefficient of the i-th channel. i Let be the linear average velocity of the i-th channel.

[0029] The second calculation module calculates the speed difference between the second and third channels, including:

[0030]

[0031] in, v1 represents the difference in linear velocity between the second and third channels, v2 represents the linear velocity of the second channel, and v3 represents the linear velocity of the third channel.

[0032] The control test module uses the same environment as the pipe to be measured for a control experiment. A five-channel ultrasonic flowmeter is used to conduct experiments under different inlet velocities and different pipe bottom fouling thicknesses in an ideal flow field, and the linear velocity values ​​v of the five channels are recorded. o1 v o2 v o3 v o4 v o5 Calculate the surface velocity of the gas inside the pipe. and the speed difference between the third and fifth channels

[0033] The comparison module will calculate the obtained surface velocity. Difference with linear velocity Surface velocity obtained from the experiment with the control group and linear velocity difference The thickness h of the fouling at the bottom of the pipe was obtained by comparison; and

[0034] The third calculation module calculates the instantaneous flow rate of the pipeline given a fouling thickness h at the bottom of the pipe, including:

[0035]

[0036] Where Q represents the instantaneous flow rate, K is the correction factor, and W... i Here, R is the quadrature coefficient for the corresponding audio channel, and X is the inner radius of the pipe. i For the quadrature node positions corresponding to the pipes, v1, v2, and v3 are the linear velocities of the first, second, and third audio channels, respectively. o1 The linear velocity of the first channel was measured as a control experiment.

[0037] According to some embodiments of this disclosure, the first computing module further includes:

[0038] Calculating the linear velocities of the first channel, the second channel, and the third channel includes:

[0039]

[0040] Where L is the channel length, θ is the angle between the sound wave and the flow velocity, and t u t is the retrograde propagation time of the vocal tract. d This refers to the anterograde propagation time of the vocal tract.

[0041] According to some embodiments of this disclosure, the control test module further includes:

[0042] v is obtained by fitting the recorded data. o1 v o2 v o3 v o4 v o5 as well as

[0043] A third aspect of this disclosure provides an electronic device comprising: one or more processors; and a storage device for storing one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors perform the method described above.

[0044] A fourth aspect of this disclosure also provides a computer-readable storage medium having executable instructions stored thereon, which, when executed by a processor, cause the processor to perform the methods described above.

[0045] The fifth aspect of this disclosure also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described method.

[0046] According to the embodiments of the present disclosure, the measurement method and measuring device of the multi-channel ultrasonic gas flow meter, compared with the channel layout of the traditional weighting coefficient method, the improved method ensures that no two channels are approximately equal in a uniform and stable flow field. In a uniform and stable flow field, more velocity gradients are measured without increasing the number of channels, thus improving the accuracy of the measurement results. The third channel is close to the bottom of the pipe, making it more sensitive to impurities deposited at the bottom, and the measurement is more accurate when there are impurities at the bottom. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the parallel layout of multi-channel transducers in related technologies;

[0048] Figure 2 This is a flowchart of a measurement method for a multi-channel ultrasonic gas flow meter according to an exemplary embodiment of the present disclosure;

[0049] Figure 3 This is a schematic diagram of the channel arrangement of a multi-channel ultrasonic gas flow meter according to an exemplary embodiment of the present disclosure;

[0050] Figure 4 This is a schematic diagram of dirt deposited at the bottom of a pipe according to an exemplary embodiment of the present disclosure. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0052] However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of this disclosure. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of embodiments of this disclosure for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known technologies are omitted in the following description to avoid unnecessarily obscuring the concepts of this disclosure.

[0053] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. The term "comprising" as used herein indicates the presence of features, steps, or operations, but does not exclude the presence or addition of one or more other features.

[0054] When using expressions such as "at least one of A, B, and C," the expression should generally be interpreted in accordance with the meaning commonly understood by a person skilled in the art (e.g., "a system having at least one of A, B, and C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C, etc.). Similarly, when using expressions such as "at least one of A, B, or C," the expression should generally be interpreted in accordance with the meaning commonly understood by a person skilled in the art (e.g., "a system having at least one of A, B, or C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C, etc.).

[0055] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0056] In related technologies, the transducers of multi-channel flow meters are arranged in a parallel layout, such as... Figure 1 As shown, surface velocity is calculated using a weighted coefficient method based on the linear velocity measured from multiple channels. Currently, there are four commonly used weighted coefficient methods: the Gauss-Legendre method, the Tchebychev method, the Tailored method, and the Owics method.

[0057] Figure 2 This is a flowchart of a measurement method for a multi-channel ultrasonic gas flow meter according to an exemplary embodiment of the present disclosure.

[0058] According to the first aspect of this disclosure, a measurement method for a multi-channel ultrasonic gas flow meter is provided, comprising operations S201 to S206.

[0059] According to some embodiments of this disclosure, operation S201 includes: arranging the transducer positions of the ultrasonic flow meter according to a quadrature node with a node number of 5, wherein the node numbers 2, 3, and 5 correspond to the first channel, the second channel, and the third channel, respectively.

[0060] According to some embodiments of this disclosure, operation S202 includes: calculating the surface velocity of the gas inside the pipe to be measured, including:

[0061]

[0062] Among them, W i v is the quadrature coefficient of the i-th channel. iLet be the linear average velocity of the i-th channel.

[0063] According to some embodiments of this disclosure, operation S203 includes: calculating the speed difference between the second channel and the third channel, including:

[0064]

[0065] in, v1 represents the difference in linear velocity between the second and third channels, v2 represents the linear velocity of the second channel, and v3 represents the linear velocity of the third channel.

[0066] According to some embodiments of this disclosure, operation S204 includes: conducting a control experiment using the same environment as the pipe to be measured, performing experiments with a five-channel ultrasonic flowmeter under different inlet velocities and different pipe bottom fouling thicknesses in an ideal flow field, and recording the linear velocity values ​​v of the five channels. o1 v o2 v o3 v o4 v o5 Calculate the surface velocity of the gas inside the pipe. and the speed difference between the third and fifth channels

[0067] According to some embodiments of this disclosure, operation S205 includes: calculating the surface velocity. Difference with linear velocity Surface velocity obtained from the experiment with the control group and linear velocity difference The thickness h of the fouling at the bottom of the pipe is obtained by comparison.

[0068] According to some embodiments of this disclosure, operation S206 includes: calculating the instantaneous flow rate of the pipe given the bottom fouling thickness h, including:

[0069]

[0070] Where Q represents the instantaneous flow rate, K is the correction factor, and W... i Here, R is the quadrature coefficient for the corresponding audio channel, and X is the inner radius of the pipe. i For the quadrature node positions corresponding to the pipes, v1, v2, and v3 are the linear velocities of the first, second, and third audio channels, respectively. o1 The linear velocity of the first channel was measured as a control experiment.

[0071] In this embodiment, compared with the traditional channel layout based on the weighting coefficient method, the improved channel layout does not have any two channels that are approximately equal in a uniform and stable flow field. In a uniform and stable flow field, more velocity gradients are measured without increasing the number of channels, thus improving the accuracy of the measurement results. The third channel is close to the bottom of the pipe, making it more sensitive to impurities deposited at the bottom and more accurate in measuring cases where there are impurities at the bottom.

[0072] According to some embodiments of this disclosure, in operation S201, arranging the transducer positions of the ultrasonic flow meter according to a quadrature node with a node count of 5 includes arranging the transducer positions of the three-channel ultrasonic flow meter according to a quadrature node count of 5 using the Gauss-Legendre weighting coefficient method.

[0073] According to some embodiments of this disclosure, Table 1 shows the quadrature nodes and quadrature coefficients of the Gauss-Legendre weighting coefficient method.

[0074] Table 1

[0075]

[0076] Figure 3 This is a schematic diagram of the channel arrangement of a multi-channel ultrasonic gas flow meter according to an exemplary embodiment of the present disclosure. Figure 4 This is a schematic diagram of dirt deposited at the bottom of a pipe according to an exemplary embodiment of the present disclosure.

[0077] According to some embodiments of this disclosure, since in most cases the fluid velocity is approximately symmetric about the center of a circle, and the quadrature nodes of the Gauss-Legendre weighting coefficient method are symmetric about the center of a circle, taking a three-channel audio system as an example, according to the Gauss-Legendre quadrature nodes, such as... Figure 1 As shown, the positions of the three channels relative to the center of the circle are -0.774596669R, 0R, and 0.774596669R, respectively. Channel 1 and channel 3 are symmetrically distributed on both sides of channel 2.

[0078] In this embodiment, since the linear velocity values ​​measured for channel one and channel three are not significantly different, we can assume that the linear velocities of the two symmetrical string channels about the center are equal. In related technologies, measuring only the linear velocities of two gradients is clearly insufficient, leading to large accumulated errors and low measurement accuracy. In this application, utilizing the symmetry of the quadrature nodes in the Gauss-Legendre weighting method, the quadrature nodes are arranged with a total of 5 nodes, as shown below. Figure 3 and Figure 4As shown, the transducer of the ultrasonic flow meter is arranged with five nodes from top to bottom. The five selectable nodes are ±0.906179846R, ±0.538459310R, and 0R. Ideally, the linear velocities of nodes one and five are equal, and the linear velocities of nodes two and four are equal. Based on this, nodes two, three, and five are selected as the first, second, and third channels, respectively. The three channels, set in this way, have different linear velocities, resulting in high data efficiency and accurate measurement results. Furthermore, compared to existing technologies, the third channel is closer to the bottom of the pipe, and its linear velocity is more significantly affected by dirt at the bottom of the pipe, enabling more accurate measurement of gas flow in the presence of liquid or dirt in the pipe.

[0079] According to some embodiments of this disclosure, phenomena such as ice blockage and pipe wall fouling in the pipe can lead to the deposition of impurities at the bottom of the pipe, resulting in poor flow field symmetry.

[0080] According to some embodiments of this disclosure, the method for linear velocity of the first channel, the second channel, and the third channel includes:

[0081]

[0082] Where L is the channel length, θ is the angle between the sound wave and the flow velocity, and t u t is the retrograde propagation time of the vocal tract. d This refers to the anterograde propagation time of the vocal tract.

[0083] According to some embodiments of this disclosure, experiments on different inlet velocities and different bottom fouling thicknesses in an ideal flow field further include: fitting the recorded data to obtain v. o1 v o2 v o3 v o4 v o5 as well as

[0084] According to some embodiments of this disclosure, the positions of the three channels relative to the center are -0.538459310R, 0R, and 0.906179846R, respectively.

[0085] According to some embodiments of this disclosure, conducting a control experiment using the same environment as the pipe to be measured further includes: using a five-channel ultrasonic flow meter to experiment with different inlet velocities in the ideal flow field, recording the linear average velocity of the five channels at different velocities, and using curve fitting to obtain the linear velocity difference between the third and fifth channels. In actual measurements, the surface average velocity is obtained using the ideal method, namely equation (1). Then, the measured linear velocity difference between the second and third channels was... With the same surface average velocity If the error is greater than a preset threshold (e.g., 10%, 15%, 20%), it is determined that there is dirt deposit at the bottom of the pipe, and subsequent comparisons are performed to obtain the dirt deposit. If the error is less than the preset threshold, it is determined that there is no dirt deposit at the bottom of the pipe or that the impact of dirt deposit on flow measurement is within the allowable range, and the flow rate can be calculated using the following method:

[0086]

[0087] Where Q represents the instantaneous flow rate, K is the correction factor, and W... i Here, R is the quadrature coefficient for the corresponding audio channel, and X is the inner radius of the pipe. i v represents the location of the quadrature node corresponding to the pipeline. i This represents the linear velocity of the corresponding audio channel.

[0088] A second aspect of this disclosure provides a measuring device for a multi-channel ultrasonic gas flow meter, comprising: a channel arrangement module, a first calculation module, a second calculation module, a control test module, a comparison module, and a third calculation module.

[0089] The channel arrangement module arranges the transducer positions of the ultrasonic flow meter according to a quadrature node with a node number of 5, where the number of nodes 2, 3, and 5 correspond to the first channel, the second channel, and the third channel, respectively.

[0090] According to some embodiments of this disclosure, the first calculation module is used to calculate the surface velocity of the gas inside the pipe to be measured, including:

[0091]

[0092] Among them, W i v is the quadrature coefficient of the i-th channel. i Let be the linear average velocity of the i-th channel.

[0093] According to some embodiments of this disclosure, the second calculation module is used to calculate the speed difference between the second channel and the third channel, including:

[0094]

[0095] in, v1 represents the difference in linear velocity between the second and third channels, v2 represents the linear velocity of the second channel, and v3 represents the linear velocity of the third channel.

[0096] According to some embodiments of this disclosure, the control test module conducts a control experiment in the same environment as the pipe to be measured. A five-channel ultrasonic flowmeter is used to conduct experiments under different inlet velocities and different pipe bottom fouling thicknesses in an ideal flow field, recording the linear velocity values ​​v of the five channels. o1 vo2 v o3 v o4 v o5 Calculate the surface velocity of the gas inside the pipe. and the speed difference between the third and fifth channels

[0097] According to some embodiments of this disclosure, the comparison module is used to compare the calculated surface velocity. Difference with linear velocity Surface velocity obtained from the experiment with the control group and linear velocity difference The thickness h of the fouling at the bottom of the pipe is obtained by comparison.

[0098] According to some embodiments of this disclosure, the three calculation modules are used to calculate the instantaneous flow rate of the pipeline given a bottom fouling thickness h, including:

[0099]

[0100] Where Q represents the instantaneous flow rate, K is the correction factor, and W... i Here, R is the quadrature coefficient for the corresponding audio channel, and X is the inner radius of the pipe. i For the quadrature node positions corresponding to the pipes, v1, v2, and v3 are the linear velocities of the first, second, and third audio channels, respectively. o1 The linear velocity of the first channel was measured as a control experiment.

[0101] According to some embodiments of this disclosure, the first calculation module further includes: calculating the linear velocities of the first channel, the second channel, and the third channel, including:

[0102]

[0103] Where L is the channel length, θ is the angle between the sound wave and the flow velocity, and t u t is the retrograde propagation time of the vocal tract. d This refers to the anterograde propagation time of the vocal tract.

[0104] According to some embodiments of this disclosure, the control experiment module further includes: fitting the recorded data to obtain v. o1 v o2 v o3 v o4 v o5 as well as

[0105] According to some embodiments of this disclosure, the channel arrangement module uses the Gauss-Legendre weighting coefficient method to arrange the transducer positions of the three-channel ultrasonic flow meter according to a quadrature node with a node count of 5.

[0106] A third aspect of this disclosure provides an electronic device comprising: one or more processors; and a storage device for storing one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors perform the methods described above.

[0107] A fourth aspect of this disclosure also provides a computer-readable storage medium having executable instructions stored thereon, which, when executed by a processor, cause the processor to perform the methods described above.

[0108] The fifth aspect of this disclosure also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described method.

[0109] The embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. It should be noted that implementations not illustrated or described in the drawings or the main text of the specification are forms known to those skilled in the art and have not been described in detail. Furthermore, the definitions of the various components described above are not limited to the specific structures, shapes, or methods mentioned in the embodiments, and those skilled in the art can easily modify or substitute them.

[0110] It should also be noted that, in the specific embodiments of this disclosure, unless otherwise stated otherwise, the numerical parameters in this specification and the appended claims are approximate values ​​and can be changed according to the desired characteristics obtained from the content of this disclosure. Specifically, all numbers used in the specification and claims to indicate dimensions, range conditions, etc., of the composition should be understood to be modified by the term "about" in all cases. Generally, this means that there may be variations of ±10% in some embodiments, ±5% in some embodiments, ±1% in some embodiments, and ±0.5% in some embodiments.

[0111] Those skilled in the art will understand that the features described in the various embodiments and / or claims of this disclosure can be combined or combined in various ways, even if such combinations or combinations are not explicitly described in this disclosure. In particular, the features described in the various embodiments and / or claims of this disclosure can be combined or combined in various ways without departing from the spirit and teachings of this disclosure. All such combinations and / or combinations fall within the scope of this disclosure.

[0112] The specific embodiments described above further illustrate the purpose, technical solutions, and beneficial effects of this disclosure. It should be understood that the above descriptions are merely specific embodiments of this disclosure and are not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A measurement method for a multi-channel ultrasonic gas flow meter, characterized in that, include: The transducer positions of the ultrasonic flow meter are arranged according to a quadrature node with a node number of 5, where the number of nodes 2, 3, and 5 correspond to the first channel, the second channel, and the third channel, respectively. Calculate the surface velocity of the gas inside the pipe to be measured, including: （1） in, Let be the quadrature coefficient of the i-th channel. Let be the linear average velocity of the i-th channel; Calculate the speed difference between the second and third channels, including: （2） in, This represents the difference in linear velocity between the second and third channels. This is the linear velocity value for the second channel. This is the linear velocity value for the third channel; A control experiment was conducted using the same environment as the pipe to be measured. A five-channel ultrasonic flowmeter was used to conduct experiments under different inlet velocities and different pipe bottom fouling thicknesses in an ideal flow field, and the linear velocity values ​​of the five channels were recorded. , , , , Calculate the surface velocity of the gas inside the pipe. and the speed difference between the third and fifth channels The calculated surface velocity Difference with linear velocity Surface velocity obtained from the experiment with the control group and linear velocity difference The thickness h of the fouling at the bottom of the pipe was obtained by comparison; and The instantaneous flow rate of the pipeline is calculated given the thickness h of the fouling at the bottom of the pipe, including: （3） Where Q represents the instantaneous flow rate, and K is the correction factor. Here, R is the quadrature coefficient for the corresponding audio channel, and R is the inner radius of the pipe. This corresponds to the location of the quadrature node in the pipeline. , , These are the linear velocities of the first, second, and third channels, respectively. The linear velocity of the first channel was measured as a control experiment.

2. The measurement method according to claim 1, characterized in that, The method for determining the linear velocity of the first channel, the second channel, and the third channel includes: in, The length of the vocal tract. The angle between the sound wave and the flow velocity. For retrograde propagation time of the vocal tract, This refers to the anterograde propagation time of the vocal tract.

3. The measurement method according to claim 1, characterized in that, The experiments conducted under different inlet velocities and different bottom fouling thicknesses in an ideal flow field also included: By fitting the recorded data, we can obtain , , , , as well as .

4. The measurement method according to claim 1, characterized in that, The positions of the three channels relative to the center are -0.538459310R, 0R, and 0.906179846R, respectively.

5. A measuring device for a multi-channel ultrasonic gas flow meter, characterized in that, include: The channel arrangement module is suitable for arranging the transducer positions of an ultrasonic flow meter according to a quadrature node with a node number of 5, wherein the number of nodes 2, 3, and 5 correspond to the first channel, the second channel, and the third channel, respectively. The first calculation module calculates the surface velocity of the gas inside the pipe to be measured, including: （1） in, Let be the quadrature coefficient of the i-th channel. Let be the linear average velocity of the i-th channel; The second calculation module calculates the speed difference between the second and third channels, including: （2） in, This represents the difference in linear velocity between the second and third channels. This is the linear velocity value for the second channel. This is the linear velocity value for the third channel; The control test module uses the same environment as the pipe to be measured for a control experiment. A five-channel ultrasonic flow meter is used to conduct experiments under different inlet velocities and different pipe bottom fouling thicknesses in an ideal flow field, and the linear velocities of the five channels are recorded. , , , , Calculate the surface velocity of the gas inside the pipe. and the difference in linear velocity between the third and second channels. ; The comparison module will calculate the obtained surface velocity. Difference with linear velocity Surface velocity obtained from the experiment with the control group and linear velocity difference The thickness h of the fouling at the bottom of the pipe was obtained by comparison; and The third calculation module calculates the instantaneous flow rate of the pipeline given a fouling thickness h at the bottom of the pipe, including: （3） Where Q represents the instantaneous flow rate, and K is the correction factor. Here, R is the quadrature coefficient for the corresponding audio channel, and R is the inner radius of the pipe. This corresponds to the location of the quadrature node in the pipeline. , , These are the linear velocities of the first, second, and third channels, respectively. The linear velocity of the first channel was measured as a control experiment.

6. The measuring device according to claim 5, characterized in that, The first calculation module further includes: Calculating the linear velocities of the first channel, the second channel, and the third channel includes: （4） in, The length of the vocal tract. The angle between the sound wave and the flow velocity. For retrograde propagation time of the vocal tract, This refers to the anterograde propagation time of the vocal tract.

7. The measuring device according to claim 5, characterized in that, The control test module also includes: By fitting the recorded data, we can obtain , , , , , as well as .

8. An electronic device, characterized in that, include: One or more processors; Storage device for storing one or more programs. Wherein, when the one or more programs are executed by the one or more processors, the one or more processors perform the method according to any one of claims 1 to 4.

9. A computer-readable storage medium, characterized in that, It stores executable instructions that, when executed by a processor, cause the processor to perform the method according to any one of claims 1 to 4.

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