Vortex shedding flowmeter suitable for multiphase flow and pulsating flow

Abstract

The vortex shedding flowmeter comprises a long supporting arm, a converter, a pipeline connector and a vortex shedding generation mechanism, flange chucks are connected to the two sides of the outer portion of the pipeline connector in a sleeving mode, and screw fixing holes are formed in the outer portions of the flange chucks; the design of the flange chuck facilitates the connection and installation of the vortex shedding flowmeter and the pipeline. According to the vortex shedding flowmeter suitable for the multiphase flow and the pulsating flow, fluid flows more uniformly and orderly when entering a vortex shedding generation area, so that the accuracy and the stability of the vortex shedding flowmeter for measuring the multiphase flow and the pulsating flow are improved, and different fluid states and measurement requirements are better met; according to the vortex street flow meter, vortex street signals can be accurately obtained under different working conditions, the replaceable ceramic sheath can be conveniently replaced when the sheath is abraded or damaged, the whole vortex street generation assembly does not need to be replaced, the maintenance cost is reduced, and long-term stable operation of the vortex street flow meter under the complex working conditions is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of vortex flowmeters, in particular to a vortex flowmeter suitable for multiphase flow and pulsating flow. Background Art

[0002] Vortex flowmeters, fluid metering devices based on the Karman vortex principle, are widely used in fields such as petrochemicals, energy and power, and process control. They are particularly well-suited for measuring complex fluid conditions involving multiphase media such as gas, liquid, and solid, or where pressure fluctuations are present. The instability of fluid flow and the complexity of the media composition in these conditions place higher demands on the vortex flowmeter's signal acquisition accuracy and long-term operational reliability.

[0003] Traditional vortex flowmeters have the following problems when dealing with multiphase flow and pulsating flow. Their vortex generating components lack an effective fluid rectification structure, resulting in uneven velocity distribution and turbulence intensity fluctuations before the fluid enters the measurement area, which directly affects the regularity of vortex generation and the stability of signal detection; the sensing components mostly adopt a fixed single-mode design, which can neither dynamically adjust the detection position and angle according to actual working conditions, nor can it simultaneously capture multi-dimensional signals such as pressure fluctuations and flow rate changes, limiting the equipment's adaptability to complex flow fields; in addition, the conventional probe protection structure only uses a single material to achieve wear-resistant protection. When faced with long-term erosion by particulate fluids, the probe surface is prone to wear and deformation, and the integrated design of the protection component and the main structure means that local damage requires overall replacement, significantly increasing equipment maintenance costs and downtime risks. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present application provides a vortex flowmeter suitable for multiphase flow and pulsating flow to solve the technical problem that the above-mentioned vortex generating components lack an effective fluid rectification structure, resulting in uneven velocity distribution and turbulence intensity fluctuations in the fluid before entering the measurement area.

[0005] To achieve the above-mentioned objectives, the present application provides the following technical solutions: a vortex flowmeter suitable for multiphase flow and pulsating flow, comprising a supporting long arm, a converter, a pipe connector and a vortex generating mechanism, the vortex generating mechanism comprising a vortex generating assembly, the outside of the vortex generating assembly is evenly provided with rectifier grids, and there are at least twelve groups of rectifier grids, the upper and lower ends of the vortex generating assembly are equipped with dual-mode sensing assemblies, the dual-mode sensing assembly is assembled in the inner cavity of the pipe connector, the dual-mode sensing assembly comprises two groups of dual-mode sensing modules, the top of the dual-mode sensing module is equipped with a reduction motor, and a combined long arm is connected between the two groups of dual-mode sensing modules, the outside of the vortex generating assembly is equipped with an anti-erosion protection assembly, and the anti-erosion protection assembly is composed of a tungsten carbide coated probe and a replaceable ceramic sheath.

[0006] Preferably, the outside of the reduction motor is equipped with an assembly arm, and the assembly arm is connected to the inside of the pipe connector. The design of the assembly arm enhances the connection stability between the reduction motor and the pipe connector, ensuring that the reduction motor will not be displaced due to factors such as vibration during operation, thereby ensuring the normal operation of the dual-mode sensing module. The outside of the dual-mode sensing module is sleeved with a spherical bearing, and the spherical bearing is connected to the inner cavity of the pipe connector. The use of the spherical bearing enables the dual-mode sensing module to rotate flexibly and adapt to fluid impacts at different angles, while reducing frictional resistance, improving the response speed and sensitivity of the sensing module, and ensuring that the fluid changes can be sensed in a timely and accurate manner. The inner cavity of the assembly nut is embedded with a dual-mode sensing module. This embedding method enables the dual-mode sensing module to be firmly installed and not easy to loosen, ensuring a tight connection between the sensing module and the pipe connector, which is conducive to improving the reliability and stability of the measurement.

[0007] Preferably, the rectifier grid includes 12 trapezoidal guide vanes with a spiral angle of 15°, and are evenly arranged on the left and right sides of the vortex generating assembly. The trapezoidal guide vanes with a spiral angle of 15° can better guide the fluid flow, so that the fluid forms a more regular flow pattern before entering the vortex generating assembly, effectively reducing the uncertainty of the fluid flow, and improving the ability of the vortex generating assembly to generate stable vortices, thereby improving the measurement accuracy of the vortex flowmeter.

[0008] Preferably, the dual-mode sensing module includes a piezoelectric film sensor and a microwave resonant sensor. The piezoelectric film sensor is mounted in the wake region of the stepped vortex generator. Mounted in the wake region, the piezoelectric film sensor can directly sense pressure changes generated by the vortex, quickly respond to fluid flow information, and promptly convert the pressure signal into an electrical signal output, providing accurate data support for flow measurement. The microwave resonant sensor is mounted at the top of the inner cavity of the pipe connector. Mounting the microwave resonant sensor at the top of the inner cavity protects it from direct impact by the fluid and utilizes the characteristics of microwaves for non-contact detection of the fluid, reducing interference with fluid flow and improving measurement accuracy and stability.

[0009] Preferably, the piezoelectric film sensor is made of a PVDF-TrFE copolymer material and is attached to the downstream 3D position of the stepped vortex generator. The PVDF-TrFE copolymer material has excellent piezoelectric properties and flexibility, making it more adaptable to complex fluid environments. Attaching it to the downstream 3D position fully captures the pressure signals generated by the vortex, improving the sensor's sensitivity and response speed, and ensuring accurate measurement of fluid flow. Furthermore, the sensor is integrated with an ASIC chip using a MEMS process. This MEMS process makes the sensor smaller and more stable, enabling high-precision signal processing and conversion, improving the sensor's anti-interference ability, and ensuring the reliability of the measured data.

[0010] Preferably, the operating frequency band of the microwave resonant sensor is 24.05-24.25 GHz, and it adopts a Doppler frequency shift and frequency modulated continuous wave composite detection mode. This operating frequency band has good penetration and anti-interference capabilities, and can accurately sense the movement information of tiny particles in the fluid. The Doppler frequency shift and frequency modulated continuous wave composite detection mode combines the advantages of the two detection methods, improves the sensor's adaptability to different flow states, can more accurately measure fluid flow, and reduce measurement errors.

[0011] Preferably, the converter is internally equipped with a display and control module, which uses an LSTM neural network to predict pulsating flow trends. The network structure consists of three layers: an input layer, a hidden layer, and an output layer. The LSTM neural network has strong memory and processing capabilities, and can accurately capture the complex changing patterns of pulsating flows. The three-layer network structure effectively processes and analyzes input data, providing a reliable basis for pulsating flow trend prediction. The training set of the display and control module uses synthetic data containing 0-30Hz pulsating signals generated by LabVIEW, and the test set uses measured data from the Fraunhofer IFF laboratory. Using a combination of synthetic data and measured data to train and test the display and control module can enable the module to better adapt to actual working conditions, improve the accuracy and reliability of pulsating flow trend prediction, and provide strong support for flow measurement and control.

[0012] Preferably, the inner cavity of the assembly base is equipped with a temperature compensator that integrates a Pt1000 platinum resistor and a pressure sensor. The temperature compensator integrating the Pt1000 platinum resistor and the pressure sensor can monitor the temperature and pressure changes of the medium in real time, providing an accurate data basis for temperature compensation, ensuring accurate flow measurement results under different temperature and pressure conditions. Temperature compensation of the dielectric constant ε_r is performed using a Kalman filter algorithm. The Kalman filter algorithm can effectively filter the temperature compensation data, reduce noise interference, improve the accuracy and stability of temperature compensation, and enable the vortex flowmeter to maintain high measurement accuracy even in complex environments.

[0013] Preferably, flange chucks are sleeved on both sides of the outside of the pipe connector, and screw fixing holes are opened on the outside of the flange chucks. The design of the flange chucks facilitates the connection and installation of the vortex flowmeter and the pipeline. The screw fixing holes can ensure a firm and reliable connection, prevent fluid leakage, and improve the stability and safety of the entire measuring system.

[0014] Preferably, the vortex generating assembly includes a stepped vortex generator, with a chute at each of the upper and lower ends of the stepped vortex generator. The inner cavity of the chute is slidably connected to a guide plate. The design of the chute and guide plate enables the stepped vortex generator to move flexibly within a certain range, adapting to fluid impacts of different flow rates, improving the adaptability of the vortex generating assembly to different working conditions, and ensuring the generation of a stable vortex signal. The guide plate is externally connected to a square arm, and the end of the square arm away from the guide plate is connected to an assembly bolt. The top of the assembly bolt has a beveled design. The structural design of the square arm and assembly bolt facilitates the installation and fixation of the stepped vortex generator. The beveled design of the top of the assembly bolt can serve as a guide during the installation process, making installation more convenient and quick, while ensuring the firmness of the installation. A damping spring is installed between the guide plate and the chute. The damping spring can act as a buffer during fluid impact, reducing vibration of the stepped vortex generator, improving the stability and reliability of the vortex generating assembly, and extending its service life.

[0015] In summary, the present application provides a vortex flowmeter suitable for multiphase flow and pulsating flow, which has the following beneficial effects: This vortex flowmeter, which is suitable for multiphase flow and pulsating flow, has at least twelve groups of rectifying grids evenly arranged outside the vortex generating component, which can effectively rectify the fluid, help stabilize the fluid flow state, and make the fluid flow more uniform and orderly when entering the vortex generating area, thereby improving the accuracy and stability of the vortex flowmeter in measuring multiphase flow and pulsating flow.

[0016] This vortex flowmeter, suitable for multiphase flow and pulsating flow, has a dual-mode sensing assembly comprising two sets of dual-mode sensing modules, each of which is equipped with a reduction motor on top. The two sets of dual-mode sensing modules are connected by a combined long arm. This structure enables the dual-mode sensing modules to be flexibly adjusted according to actual working conditions. For example, the reduction motor can be used to fine-tune the position or angle to better adapt to different fluid states and measurement requirements, ensuring that vortex signals can be accurately obtained under different working conditions.

[0017] This vortex flowmeter, which is suitable for multiphase flow and pulsating flow, has an anti-erosion protection component composed of a tungsten carbide coated probe and a replaceable ceramic sheath mounted on the outside of the vortex generating assembly. The tungsten carbide coated probe has good wear resistance and corrosion resistance, can effectively resist the erosion of impurity particles in the fluid, and extend the service life of the probe; the replaceable ceramic sheath can be easily replaced when the sheath is worn or damaged, without replacing the entire vortex generating assembly, reducing maintenance costs and ensuring the long-term stable operation of the vortex flowmeter under complex working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front schematic diagram of the present invention.

[0019] Figure 2 It is a left schematic diagram of the present invention.

[0020] Figure 3 It is an external schematic diagram of the vortex generating mechanism of the present invention.

[0021] Figure 4 Schematic diagram of the exterior of the dual-mode sensing assembly of the present invention.

[0022] Figure 5 It is a schematic diagram of the exterior of the stepped vortex generator of the present invention.

[0023] Description of reference numerals: 1. Support long arm; 11. Assembly base; 2. Converter; 21. Display and control module; 3. Pipe connector; 31. Flange chuck; 4. Vortex generating mechanism; 41. Vortex generating assembly; 411. Stepped vortex generator; 412. Guide plate; 413. Square arm; 414. Assembly bolt; 415. Damping spring; 42. Rectifier grid; 43. Dual-mode sensor assembly; 431. Dual-mode sensor module; 432. Assembly nut; 433. Reducer motor; 434. Assembly arm; 435. Spherical bearing; 436. Combined long arm. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0025] This application provides a technical solution, please refer to Figure 1 and Figure 2 , see Figure 1 and Figure 2 A vortex flowmeter suitable for multiphase flow and pulsating flow includes a supporting long arm 1, a converter 2, a pipe connector 3 and a vortex generating mechanism 4. The vortex generating mechanism 4 includes a vortex generating component 41. The outside of the vortex generating component 41 is evenly distributed with rectifier grids 42, and there are at least twelve groups of rectifier grids 42. The evenly distributed rectifier grids 42 can effectively improve the fluid flow state, reduce the influence of fluid turbulence on measurement accuracy, and make the fluid flow more smooth and orderly, thereby improving the measurement stability and accuracy of the vortex flowmeter under complex fluid conditions.

[0026] The upper and lower ends of the vortex generating assembly 41 are equipped with dual-modal sensing assemblies 43, and the dual-modal sensing assembly 43 is installed in the inner cavity of the pipe connector 3. The dual-modal sensing assembly 43 includes two groups of dual-modal sensing modules 431. The top of the dual-modal sensing module 431 is equipped with a reduction motor 433. A combined long arm 436 is connected between the two groups of dual-modal sensing modules 431. The dual-modal sensing assembly 43 combines multiple sensing methods and can perceive fluid information more comprehensively, improve the adaptability to complex flow fields such as multiphase flow and pulsating flow, ensure that fluid signals can be accurately captured under different working conditions, and effectively reduce measurement errors.

[0027] See also Figure 3 and Figure 4 as well as Figure 5 The outside of the vortex generating assembly 41 is equipped with an anti-erosion protection assembly, which is composed of a tungsten carbide coated probe and a replaceable ceramic sheath. The anti-erosion protection assembly can effectively resist the erosion of the probe by particles in the fluid, thereby extending the service life of the probe. At the same time, the replaceable ceramic sheath design is convenient for timely replacement after the sheath is worn, thereby ensuring the long-term stable operation of the vortex flowmeter and reducing maintenance costs.

[0028] The outside of the reduction motor 433 is equipped with an assembly arm 434, which is connected to the inside of the pipe connector 3. The design of the assembly arm 434 enhances the connection stability between the reduction motor 433 and the pipe connector 3, ensuring that the reduction motor 433 will not be displaced due to factors such as vibration during operation, thereby ensuring the normal operation of the dual-modal sensing module 431.

[0029] See also Figure 3 and Figure 4 as well as Figure 5 The exterior of dual-mode sensing module 431 is sheathed with a spherical bearing 435, which is connected to the inner cavity of pipe connector 3. The use of spherical bearing 435 enables dual-mode sensing module 431 to rotate flexibly to adapt to fluid impacts at different angles, while also reducing frictional resistance, improving the sensing module's response speed and sensitivity, and ensuring timely and accurate perception of fluid changes. The inner cavity of assembly nut 432 is embedded with dual-mode sensing module 431. This embedding method ensures that dual-mode sensing module 431 is securely installed and not easily loosened, ensuring a tight connection between the sensing module and pipe connector 3, which helps improve measurement reliability and stability.

[0030] The rectifier grid 42 includes 12 trapezoidal guide vanes with a spiral angle of 15°, and is evenly arranged on the left and right sides of the vortex generating assembly 41. The trapezoidal guide vanes with a spiral angle of 15° can better guide the fluid flow, so that the fluid forms a more regular flow pattern before entering the vortex generating assembly 41, effectively reducing the uncertainty of the fluid flow, and improving the ability of the vortex generating assembly 41 to generate stable vortices, thereby improving the measurement accuracy of the vortex flowmeter.

[0031] The dual-modal sensing module 431 includes a piezoelectric film sensor and a microwave resonant sensor. The piezoelectric film sensor is installed in the wake area of ​​the stepped vortex generator 411. The piezoelectric film sensor installed in the wake area can directly sense the pressure changes caused by the vortex, quickly respond to fluid flow information, and promptly convert the pressure signal into an electrical signal output, providing accurate data support for flow measurement.

[0032] The microwave resonant sensor is installed at the top of the inner cavity of the pipe connector 3. The microwave resonant sensor is installed at the top of the inner cavity to avoid direct impact by the fluid. At the same time, it can use the characteristics of microwaves to perform non-contact detection of the fluid, reduce interference with the fluid flow, and improve measurement accuracy and stability.

[0033] The piezoelectric film sensor adopts PVDF-TrFE copolymer material and is pasted at the downstream 3D position of the stepped vortex generator 411. The PVDF-TrFE copolymer material has good piezoelectric properties and flexibility, and can better adapt to complex fluid environments. Pasting it at the downstream 3D position can fully capture the pressure signal generated by the vortex, improve the sensitivity and response speed of the sensor, ensure accurate measurement of the fluid flow, and operate through the MEMS process integrated ASIC chip. The MEMS process integrated ASIC chip makes the sensor smaller and more stable, can achieve high-precision signal processing and conversion, improve the sensor's anti-interference ability, and ensure the reliability of the measurement data.

[0034] The microwave resonant sensor operates in the 24.05-24.25 GHz frequency band and uses a Doppler shift and frequency modulated continuous wave composite detection mode. This operating frequency band has good penetration and anti-interference capabilities, and can accurately sense the movement information of tiny particles in the fluid. The Doppler shift and frequency modulated continuous wave composite detection mode combines the advantages of the two detection methods, improves the sensor's adaptability to different flow states, and can more accurately measure fluid flow and reduce measurement errors.

[0035] Converter 2 is internally equipped with a display and control module 21, which uses an LSTM neural network to predict pulsating flow trends. The network structure consists of three layers: an input layer, a hidden layer, and an output layer. The LSTM neural network has powerful memory and processing capabilities, accurately capturing the complex variations of pulsating flows. Through this three-layer network structure, it effectively processes and analyzes input data, providing a reliable basis for pulsating flow trend prediction. The training set for display and control module 21 utilizes synthetic data containing 0-30Hz pulsating signals generated by LabVIEW, while the test set utilizes measured data from the Fraunhofer IFF laboratory. This combination of synthetic and measured data allows the module to better adapt to actual operating conditions, improves the accuracy and reliability of pulsating flow trend predictions, and provides strong support for flow measurement and control.

[0036] The inner cavity of assembly base 11 is equipped with a temperature compensator that integrates a Pt1000 platinum resistor and a pressure sensor. This integrated temperature compensator monitors changes in the medium's temperature and pressure in real time, providing accurate data for temperature compensation and ensuring accurate flow measurement results under varying temperature and pressure conditions. Temperature compensation for the dielectric constant ε_r is performed using a Kalman filter algorithm. This algorithm effectively filters the temperature compensation data, reducing noise interference and improving the accuracy and stability of temperature compensation, enabling the vortex flowmeter to maintain high measurement accuracy even in complex environments.

[0037] Flange clamps 31 are sleeved on both sides of the outside of the pipe connector 3, and screw fixing holes are opened on the outside of the flange clamp 31. The design of the flange clamp 31 facilitates the connection and installation of the vortex flowmeter and the pipeline. The screw fixing holes can ensure a firm and reliable connection, prevent fluid leakage, and improve the stability and safety of the entire measurement system.

[0038] See also Figure 3 、 Figure 4 and Figure 5 The vortex generating assembly 41 includes a stepped vortex generating body 411, and the rectifying grid 42 is connected to the stepped vortex generating body 411. The upper and lower ends of the stepped vortex generating body 411 are provided with a slide groove, and the inner cavity of the slide groove is slidably connected to the guide plate 412. The design of the slide groove and the guide plate 412 enables the stepped vortex generating body 411 to move flexibly within a certain range, adapt to the impact of fluids with different flow rates, improve the adaptability of the vortex generating assembly 41 to different working conditions, and ensure the generation of a stable vortex signal.

[0039] The outside of the guide plate 412 is connected to a square arm 413, and the end of the square arm 413 away from the guide plate 412 is connected to an assembly bolt 414. The top of the assembly bolt 414 is designed with an inclined surface. The structural design of the square arm 413 and the assembly bolt 414 facilitates the installation and fixation of the stepped vortex generator 411. The inclined surface design of the top of the assembly bolt 414 can play a guiding role during the installation process, making the installation more convenient and quick, while ensuring the firmness of the installation.

[0040] A damping spring 415 is installed between the guide plate 412 and the slide groove. The damping spring 415 can play a buffering role when the fluid impacts, reduce the vibration of the stepped vortex generator 411, improve the stability and reliability of the vortex generating assembly 41, and extend its service life.

[0041] The vortex flowmeter in this embodiment begins with the fluid entering the measuring pipe section through pipe connector 3. At this point, the fluid first contacts the rectifier grid 42 of the vortex generator 4. The rectifier grid 42 consists of 12 trapezoidal guide vanes with a helical angle of 15°, arranged symmetrically along the axis of the vortex generator 41 on the fluid inlet side.

[0042] When multiphase flow or pulsating flow enters, the guide vane guides the fluid to form a rotating flow through the spiral surface. Its 15° spiral angle design enables the fluid to produce a controllable pre-rotation effect, decomposing large-scale turbulent vortices into small-scale vortex structures.

[0043] This process reduces the pulsation amplitude of the fluid's kinetic energy through an energy cascade effect. The trapezoidal cross-section design simultaneously creates a pressure gradient field in the axial direction, promoting a uniform velocity distribution in the radial direction. Experimental data shows that this rectifying structure can reduce the fluid's turbulence intensity by 42% and increase the flatness of the velocity profile to above 0.92, creating stable flow conditions for subsequent vortex formation.

[0044] The rectified fluid reaches the stepped vortex generator 411, whose asymmetric stepped structure generates a Karman vortex street phenomenon under the action of the fluid. The chute on the surface of the vortex generator forms a sliding pair with the guide plate 412. As the flow rate changes, the damping spring 415 adjusts the axial position of the generator through elastic deformation.

[0045] At low flow rates, the compression of the damping spring 415 decreases, causing the guide plate 412 to move outward along the chute, increasing the shedder's flow area. At high flow rates, the compression of the damping spring 415 increases, causing the shedder to automatically contract to maintain the optimal vortex shedding frequency. This adaptive adjustment mechanism stabilizes the Strouhal number St within a range of 0.18-0.22, ensuring a linear relationship between vortex generation frequency and flow rate.

[0046] Tests show that within the flow velocity range of 0.5-12 m / s, the vortex shedding frequency deviation does not exceed ±1.2%.

[0047] During the vortex generation process, the dual-modal sensing component 43 begins to work. The piezoelectric film sensor uses PVDF-TrFE copolymer material, integrates an ASIC chip through the MEMS process, and is attached to the downstream wake area of ​​the stepped vortex generator 411 at a spacing of 3 times the pipe diameter. When the vortex passes, periodic pressure pulsations are generated in the wake area, and the piezoelectric film converts the mechanical stress into a charge signal. Its unique copolymer formula enables the piezoelectric coefficient d31 to reach -21pC / N. Combined with the charge amplification circuit of the ASIC chip, it can achieve weak pressure signal detection at the level of 0.1kPa. At the same time, the microwave resonant sensor emits 24.05-24.25GHz electromagnetic waves at the top of the pipeline, and captures the motion information of the dispersed phase particles in the fluid through the Doppler frequency shift and frequency modulated continuous wave (FMCW) composite detection mode. When the pulsating flow passes, the sensor simultaneously obtains the pressure pulsation signal and the microwave Doppler frequency shift signal, and the two modal data are transmitted to the converter 2 through the combined long arm 436.

[0048] During the signal processing phase, the two sets of signals from the dual-mode sensing module 431 first enter the pre-processing circuit. The piezoelectric signals undergo charge amplification and low-pass filtering with a cutoff frequency of 2kHz and a 50Hz power frequency notch to remove mechanical vibration noise.

[0049] The microwave signal is demodulated to a baseband signal through a mixer, and then subjected to a fast Fourier transform to extract spectral features. The processed dual-modal signals are then fused in a digital signal processor, using an adaptive weighting algorithm to assign weights: for steady-state flow, the piezoelectric signal is weighted 0.7, and the microwave signal 0.3; for pulsating flow conditions, the weights are automatically adjusted to 0.4 and 0.6. This fusion strategy reduces measurement uncertainty from 2.8% for a single mode to 1.1%.

[0050] The temperature compensation module monitors the fluid temperature in real time using a Pt1000 platinum resistor within the assembly base 11. Combined with pressure sensor data, it uses a table to obtain the fluid dielectric constant ε_r under the current operating conditions. A Kalman filter algorithm is used to dynamically compensate for temperature drift. Its state equation includes temperature gradient and pressure coupling terms, and the measurement noise covariance matrix is ​​optimized using laboratory calibration data. Field measurements show that the compensated flow rate error can be controlled within ±0.5% within the temperature range of -40°C to 150°C.

[0051] For pulsating flow conditions, the display and control module 21 activates an LSTM neural network for trend prediction. The network input layer receives the bimodal fusion signal, temperature compensation value, and historical prediction error for the current moment and the previous two cycles. The hidden layer has 64 memory cells, and the output layer provides flow predictions for the next 0.5 seconds. The training dataset consists of a 0-30Hz sinusoidal pulsating signal with a signal-to-noise ratio of 20dB generated by LabVIEW and gasoline-air two-phase flow data measured by the Fraunhofer IFF laboratory. Transfer learning is used to improve the model's generalization capabilities. Field tests have shown that this prediction module can improve the repeatability of pulsating flow measurements from ±3.7% to ±1.9%.

[0052] The final processed flow data is transmitted to the control system through the flange clamp 31 of the pipe connector 3. The flange clamp 31 adopts a double O-ring sealing structure and is arranged in an equilateral triangle with the screw fixing holes to ensure that the leakage rate is less than 1×10⁻ at a pressure of 10MPa. 9 When maintenance is required, the vortex generating assembly 41 can be removed by disassembling the assembly bolts 414. The inclined surface design reduces the disassembly torque by 40%. The ceramic sheath can be replaced using a quick connector, shortening maintenance time to less than 30 minutes.

[0053] The anti-erosion protection components remain in place throughout the measurement process. The tungsten carbide-coated probe has a surface hardness of HV3000 and features a replaceable ceramic sheath with a 95% Al2O3 content. In a sand-laden flow erosion test with a sand particle diameter of 0.5 mm and a flow rate of 8 m / s, the probe surface roughness increased by only 0.2 μm after 2000 hours of continuous operation, and the signal amplitude attenuation did not exceed 3%. This protective design extends the flowmeter's service life to over five years in solid-liquid two-phase flow.

[0054] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0055] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A vortex flowmeter suitable for multiphase flow and pulsating flow, comprising a supporting long arm (1), a converter (2), a pipe connector (3) and a vortex generating mechanism (4), characterized in that: The vortex generating mechanism (4) includes a vortex generating assembly (41), the outside of the vortex generating assembly (41) is evenly provided with a rectifier grid (42), and there are at least twelve groups of rectifier grids (42), the upper and lower ends of the vortex generating assembly (41) are both equipped with a dual-mode sensing assembly (43), the dual-mode sensing assembly (43) is assembled in the inner cavity of the pipe connector (3), the dual-mode sensing assembly (43) includes two groups of dual-mode sensing modules (431), the top of the dual-mode sensing module (431) is equipped with a reduction motor (433), and a combined long arm (436) is connected between the two groups of dual-mode sensing modules (431), and the outside of the vortex generating assembly (41) is equipped with an anti-erosion protection assembly, which is composed of a tungsten carbide coated probe and a replaceable ceramic sheath.

2. A vortex flowmeter suitable for multiphase flow and pulsating flow according to claim 1, characterized in that: The outside of the reduction motor (433) is equipped with an assembly arm (434), and the assembly arm (434) is connected to the inside of the pipe connector (3). The outside of the dual-mode sensing module (431) is sleeved with a spherical bearing (435), and the spherical bearing (435) is connected to the inner cavity of the pipe connector (3). The inner cavity of the assembly nut (432) is embedded with the dual-mode sensing module (431).

3. The vortex flowmeter suitable for multiphase flow and pulsating flow according to claim 1, characterized in that: The rectifier grid (42) comprises 12 trapezoidal guide vanes with a spiral angle of 15°, and is evenly arranged on the left and right sides of the vortex generating assembly (41).

4. The vortex flowmeter suitable for multiphase flow and pulsating flow according to claim 1, characterized in that: The dual-mode sensing module (431) includes a piezoelectric film sensor and a microwave resonance sensor. The piezoelectric film sensor is mounted on the wake region of the stepped vortex generator (411), and the microwave resonance sensor is mounted on the top of the inner cavity of the pipe connector (3).

5. The vortex flowmeter suitable for multiphase flow and pulsating flow according to claim 4, characterized in that: The piezoelectric film sensor is made of PVDF-TrFE copolymer material, is attached to the downstream 3D position of the stepped vortex generator (411), and is integrated with an ASIC chip through a MEMS process for operation.

6. The vortex flowmeter suitable for multiphase flow and pulsating flow according to claim 4, characterized in that: The microwave resonant sensor operates in a frequency band of 24.05-24.25 GHz and adopts a Doppler frequency shift and frequency modulated continuous wave composite detection mode.

7. The vortex flowmeter suitable for multiphase flow and pulsating flow according to claim 1, characterized in that: The converter (2) is internally equipped with a display and control module (21). The display and control module (21) uses an LSTM neural network to predict the pulsating flow trend. The network structure has three layers, namely an input layer, a hidden layer, and an output layer. The training set of the display and control module (21) uses synthetic data containing 0-30 Hz pulsating signals generated by LabVIEW, and the test set uses actual measured data from the Fraunhofer IFF laboratory.

8. The vortex flowmeter suitable for multiphase flow and pulsating flow according to claim 1, characterized in that: The inner cavity of the assembly base (11) is equipped with a temperature compensator, which integrates a Pt1000 platinum resistor and a pressure sensor, and performs temperature compensation of the dielectric constant ε_r through a Kalman filter algorithm.

9. The vortex flowmeter suitable for multiphase flow and pulsating flow according to claim 1, characterized in that: Flange clamps (31) are sleeved on both sides of the exterior of the pipe connector (3), and screw fixing holes are provided on the exterior of the flange clamps (31).

10. The vortex flowmeter suitable for multiphase flow and pulsating flow according to claim 1, characterized in that: The vortex generating assembly (41) includes a stepped vortex generating body (411), wherein the upper and lower ends of the stepped vortex generating body (411) are both provided with a slide groove, the inner cavity of the slide groove is slidably connected to a guide plate (412), the outside of the guide plate (412) is connected to a square arm (413), and the end of the square arm (413) away from the guide plate (412) is connected to an assembly bolt (414), the top of the assembly bolt (414) is designed as an inclined surface, and a damping spring (415) is installed between the guide plate (412) and the slide groove.

Images