A vortex flow sensor structure optimization design method

Abstract

The application discloses a vortex flow sensor structure optimization design method, comprising the following steps: constructing a simulation structure model of a vortex flow sensor; constructing an acceleration axial distribution curve equation of the vortex flow sensor structure; based on the maximum acceleration limit value of fluid in the vortex flow sensor, randomly setting the position of the maximum acceleration of the curve contraction structure, and based on the vortex flow sensor size, setting the length of the combined contraction section component; based on the acceleration axial distribution curve equation, solving and obtaining the structure design parameters of the vortex flow sensor to confirm the structure contraction curve equation; obtaining the fluid flow rate of the vortex flow sensor according to the structure contraction curve equation; based on the constructed structure evaluation index model, confirming the structure optimization design meeting the preset expected index according to the fluid flow rate and the structure design parameters, which can not only ensure the smooth transition of the fluid flow rate, but also reduce the turbulence and fluid separation phenomenon, and through the flexible optimization design of the vortex flow sensor structure according to different occasions, the stability and the measurement precision of the vortex flow sensor vortex signal are greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vortex flowmeter, and particularly relates to a vortex flow sensor structure optimization design method. BACKGROUND

[0002] The vortex flowmeter is a flow measuring instrument widely used in petroleum, chemical industry, power and water treatment industries, and has the advantages of simple structure, high precision, wide application range and convenient maintenance. The core principle of the vortex flowmeter is to utilize the Karman vortex street phenomenon generated when the fluid passes through the contraction section, and to realize flow measurement by measuring the relationship between the vortex frequency and the flow. The stability and precision of the vortex signal are closely related to the design of the contraction section, and therefore, the optimization design of the contraction section is the key to improving the performance of the vortex flowmeter. In fluid mechanics, the turbulence degree of the fluid is an important parameter for measuring the degree of flow chaos. When the turbulence degree is high, the flow of the fluid becomes chaotic and unstable, and the formation of the vortex may be disturbed, resulting in fluctuation of the vortex frequency and affecting the measurement accuracy of the flow. When the turbulence degree is low, the liquid flow is more stable, the vortex signal is stable and easy to extract, thereby improving the accuracy and reliability of the measurement. Therefore, when designing the contraction section of the vortex flowmeter, the influence of the fluid turbulence degree on the stability, accuracy of the measurement and the overall performance of the flowmeter should be considered.

[0003] The most common contraction section structure design in the vortex flowmeter includes three forms of straight neck, cross-section neck and curve-free neck. The straight neck structure adopts a simple linear contraction shape to gradually reduce the cross-sectional area of the pipeline. This structure has the advantages of simple design and low manufacturing cost, but this structure will cause the fluid velocity to continuously increase in the contraction section, and the fluid still has acceleration when entering the measurement area, which will cause separation or turbulence phenomenon. This will cause uneven distribution of fluid velocity, forming vortex or local turbulence, resulting in measurement error and affecting the stability of the vortex signal.

[0004] The cross-section neck structure does not have a traditional contraction section, but directly reduces the pipe diameter from a large size to a small size, causing the fluid velocity to rapidly accelerate to a maximum value. This change mainly occurs at the entrance of the measurement section. Therefore, different flow layers will appear at the entrance of the measurement section, causing the formation of vortexes and increasing the turbulence degree of the fluid. The curve neck structure adopts a gradual curve shape to guide the flow of the fluid, which can better reduce the sudden change of the flow velocity and avoid the occurrence of severe turbulence and separation phenomenon, so the vortex signal is relatively stable. However, the manufacturing process of the curve contraction is relatively complex, and for the application occasions with a large flow range, the contraction ratio may be insufficient, which will limit the measurement accuracy.

[0005] In summary, the current vortex flowmeter structure cannot ensure the smooth transition of the fluid velocity while reducing turbulence and fluid separation phenomenon. SUMMARY

[0006] The application provides a vortex flow sensor structure optimization design method to overcome the above technical problems.

[0007] To achieve the above-mentioned purpose, the technical scheme of the application is:

[0008] A vortex flow sensor structure optimization design method, specifically comprising the following steps:

[0009] S1: Construct a simulation structure model of the vortex flow sensor;

[0010] And the simulation structure model comprises a stable segment component for rectifying fluid, a combined contraction segment component for optimizing the flow velocity distribution of the stable segment component output fluid and reducing the turbulence degree to obtain the fluid vortex signal, and a measurement segment component for detecting the fluid vortex signal, which are connected in sequence;

[0011] And the combined contraction segment component comprises a straight-line contraction structure and a curved-line contraction structure;

[0012] S2: Construct an acceleration axial distribution curve equation of the vortex flow sensor structure;

[0013] S3: Based on the maximum acceleration limit value of the fluid in the vortex flow sensor, randomly set the position of the maximum acceleration of the curved-line contraction structure, and set the length of the combined contraction segment component based on the size of the vortex flow sensor;

[0014] S4: Based on the acceleration axial distribution curve equation, according to the position of the maximum acceleration and the length of the combined contraction segment component, solve and obtain the structure design parameters of the vortex flow sensor, and confirm the structure contraction curve equation based on the structure design parameters;

[0015] S5: Obtain the fluid flow velocity of the vortex flow sensor according to the structure contraction curve equation;

[0016] S6: Based on the constructed structure evaluation index model, determine whether the preset expected index is met according to the fluid flow velocity and the structure design parameters;

[0017] If the preset expected index is met, confirm the structure contraction ratio of the vortex flow sensor based on the fluid flow velocity, and the confirmed structure contraction ratio, the position of the maximum acceleration of the curved-line contraction structure set at this time and the length of the combined contraction segment component are the results of the geometric structure optimization design of the vortex flow sensor;

[0018] Otherwise, the position of the maximum acceleration and the length of the contraction segment are reselected, and step S4 is repeatedly executed.

[0019] Further, the construction method of the acceleration axial distribution curve equation of the vortex flow sensor structure in S2 specifically comprises the following steps

[0020] S21: obtaining an axial acceleration function of the vortex flow sensor structure and a function limit condition;

[0021] The axial acceleration function includes an acceleration axial distribution function of a straight line contraction section structure and an acceleration axial distribution function of a curved line contraction section structure, and the expression is

[0022] l1=a1x (1)

[0023] l2=a2x+b2x+c2 (2) 2

[0024] In the formula, l1 represents the acceleration of the straight line contraction section; l2 represents the acceleration of the curved line contraction section; a1, a2, b2 and c2 represent constant term coefficients of the axial acceleration function; and x represents the distance from the cross section to the combined contraction section construction entrance;

[0025] The expression of the function limit condition is

[0026] a1>0, a2<0; b2>0 (3)

[0027]

[0028] x2=L (7)

[0029] In the formula, x1 and x2 represent analytical solutions of the acceleration axial distribution function of the curved line contraction section; L represents the length of the combined contraction section; and m represents the position where the acceleration reaches the maximum;

[0030] S22: simplifying the formula (4), and the expression is

[0031]

[0032] The formula (9) can be obtained by combining the formula (8) and the formula (6)

[0033]

[0034] S23: combining the formula (9), the formula (6) and the formula (7), the formula (10) can be obtained

[0035]

[0036] Further, the formula (11) can be obtained by combining the formula (10) and the formula (6)

[0037]

[0038] S24: combining the formula (11) and the formula (10), the formula (12) can be obtained ​

[0039]

[0040] And further, the formula (13) can be obtained by combining the formula (12) with the formula (8)

[0041]

[0042] S25: Constructing the acceleration axial distribution curve equation of the vortex flow sensor structure according to step S24, the expression is

[0043]

[0044] Further, the S4 specifically comprises the following steps

[0045] S41: Obtaining the one-dimensional fluid acceleration equation for inputting the fluid of the vortex flow sensor, the expression is

[0046]

[0047] And simplifying the equation to obtain the formula (16)

[0048] Kadx = udu (16)

[0049] In the formula, u represents the fluid flow rate; K represents the structural design parameter of the vortex flow sensor to be solved; a represents the fluid acceleration;

[0050] S42: Bringing the formula (14) into the formula (16) to perform piecewise integral operation, solving and obtaining the fluid flow field, the expression is

[0051] In the range of x≤m, when x=m, u=u1, the fluid flow field is obtained as:

[0052] u1 2 = u0 2 +Km 2 (L-m) 2 (17)

[0053] In the range of m

[0054]

[0055] S43: Combining the formula (17) with the formula (18) to obtain the structural design parameter of the vortex flow sensor, the expression is

[0056]

[0057] And the acquired vortex street flow sensor structure design parameters, back into the equation (17) and equation (18) to get the vortex street flow sensor structure contraction curve equation.

[0058] Further, the S6 in the structure evaluation index model based on the construction, according to the fluid flow rate and structure design parameters to confirm whether to meet the preset expectations index, specifically

[0059] Based on the structure evaluation index model based on the construction, according to the fluid flow rate and structure design parameters to confirm whether to meet the preset expectations index;

[0060] And the preset expectations index includes the preset vortex frequency threshold and the preset volume flow threshold;

[0061] If the preset expectations index is met, the vortex street flow sensor structure contraction ratio is confirmed based on the fluid flow rate, and the confirmed structure contraction ratio, the position of the maximum acceleration of the curve contraction structure at this time and the length of the combined contraction section component are the results of the geometric structure optimization design of the vortex street flow sensor;

[0062] And the expression of the vortex street flow sensor structure contraction ratio is

[0063] u0S0=u1S1=u2S2=n (20)

[0064] In the formula: n represents the contraction ratio; u0 represents the velocity of the fluid flowing into the combined contraction section component; S0 represents the cross-sectional area of the fluid flowing into the combined contraction section component; u2 represents the velocity of the fluid flowing out of the combined contraction section component; S2 represents the cross-sectional area of the fluid flowing out of the combined contraction section component; u1 represents the velocity of the fluid at the maximum acceleration m of the contraction section component; S1 represents the cross-sectional area of the fluid at the maximum acceleration m of the contraction section component;

[0065] Otherwise, the maximum acceleration position and the contraction section length are reselected, and step S4 is repeatedly executed.

[0066] Further, the structure evaluation index model constructed in S6 has the expression

[0067]

[0068] In the formula: f represents the vortex frequency; U represents the fluid flow rate, which is the output of the vortex street flow sensor structure contraction curve equation; D represents the characteristic size of the vortex street generator, i.e. the combined contraction section component; S t St represents the Strouhal number and is a constant; Q represents the volume flow of the vortex street flow sensor; K represents the structure design parameters of the vortex street flow sensor.

[0069] Beneficial effects: the application provides a vortex flow sensor structure optimization design method, by combining the contraction section component, that is, combining the straight line contraction structure and the curved contraction structure, the sharp change of the flow velocity in the contraction process is reduced while the manufacturing complexity and cost are reduced, the fluid can enter the measurement section component smoothly and without vortex, the structure design parameters of the vortex flow sensor are solved and obtained based on the acceleration axial distribution curve equation, to confirm the structure contraction curve equation and obtain the fluid flow velocity of the vortex flow sensor; based on the constructed structure evaluation index model, the contraction ratio, the contraction section length and the maximum position of fluid acceleration are confirmed to meet the preset expected index according to the fluid flow velocity and the structure design parameters, so as to realize flexible optimization design of the vortex flow sensor structure according to different occasions, so as to provide more accurate and stable measurement results under various complex working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0070] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0071] Figure 1 The flow chart of the vortex flow sensor structure optimization design method of the present application;

[0072] Figure 2 The structure model schematic diagram of the vortex flow sensor in the present embodiment;

[0073] Figure 3 The structure schematic diagram of the combined contraction section component in the present embodiment;

[0074] Figure 4 The axial acceleration distribution curve diagram in the present embodiment;

[0075] Figure 5 The overall design flow chart of the vortex flow sensor structure in the present embodiment. DETAILED DESCRIPTION

[0076] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0077] The embodiment provides a vortex flow sensor structure optimization design method, as shown in the following specific steps. Figures 1 to 3

[0078] S1: constructing a simulation structure model of the vortex flow sensor;

[0079] The simulation structure model comprises, which are connected in sequence, a stabilizing segment component for rectifying fluid, a combined contraction segment component for optimizing the flow velocity distribution of the output fluid of the stabilizing segment component and reducing the turbulence degree to obtain a fluid vortex signal, and a measuring segment component for detecting the fluid vortex signal, and the combined contraction segment component comprises a straight-line contraction structure and a curve contraction structure.

[0080] Specifically, according to the fluid turbulence theory, in the straight-line contraction segment, the fluid acceleration is greater than zero and increases all the time, the speed reaches the maximum at the entrance of the measuring segment, there is a flow velocity difference between layers, and there is turbulence; in the curve contraction segment, the fluid acceleration is greater than zero and gradually increases from zero, reaches the maximum, and then gradually decreases. In an ideal case, the fluid acceleration in the contraction segment increases from zero, reaches the maximum, and then decreases to zero. This means that the flow velocity of the fluid in the contraction segment continuously increases, and at the moment when the fluid flows out of the contraction segment, the flow velocities between layers are consistent, there is no flow velocity difference, and the turbulence degree of the fluid remains unchanged. Therefore, the new contraction segment structure, that is, the combined contraction segment component, designed in the embodiment adopts the structure of straight-line contraction in front and curve contraction in back, so as to ensure that there is no turbulence when the fluid enters the measuring segment; as shown in the following figure. Figure 2 ​The functions of the stabilizing section are: (1) flow regulation: the stabilizing section can eliminate uneven flow distribution or turbulence caused by external interference (such as bends, valves, etc.) before the fluid enters the flowmeter, making the fluid form a uniform and stable velocity field; (2) reducing turbulence: the stabilizing section eliminates excess vortices or local turbulence, reducing the turbulence of the fluid, and providing a stable flow environment for the generation of vortex street signals; (3) optimizing vortex generation conditions: by stabilizing the flow velocity and pressure distribution, the formation conditions of vortex street are more ideal, improving the measurement accuracy and signal stability. The combined contraction section is designed by combining straight and curved contraction structures, which mainly functions to optimize the flow velocity distribution and reduce turbulence, and its specific functions are: (1) smooth transition of flow velocity: the combined design makes the change of fluid flow velocity from large to small cross-section more smooth, reducing turbulence or separation caused by sudden contraction; (2) pressure loss control: reducing the pressure drop of the fluid flowing through the contraction section, reducing energy loss; (3) improving measurement accuracy: providing uniform and stable flow field conditions for the subsequent measurement section, ensuring the stable and reliable generation of vortex street signals; (4) adapting to different flow ranges: the combined design can adapt to different flow rates and flow measurement requirements, providing a wider range of applications. The measurement section is the area in the vortex flowmeter that directly detects the vortex street signals of the fluid, and its main function is to collect vortex street signals and convert them into measurable physical quantities, and its specific functions are: (1) vortex street signal generation: the measurement section induces the fluid to produce Karman vortex street through the built-in vortex generator, and makes the vortex street signal form clearly and stably in this section; (2) signal collection and transmission: the measurement section is equipped with sensors to detect the frequency, amplitude and other characteristics of the vortex street, and convert the signal into an electrical signal output; (3) flow calculation: the vortex frequency collected by the measurement section is proportional to the flow of the fluid, and based on this relationship, the flow of the fluid can be obtained; (4) ensuring measurement stability: the design of the measurement section directly affects the quality and stability of the vortex street signal, and plays a decisive role in the measurement accuracy of the overall flowmeter. The measurement section component is provided with a structure for the generator A, which is one of the core components of the vortex flowmeter, and its main function is to induce the fluid to form stable Karman vortex street, thereby realizing flow measurement.

[0081] S2: constructing an acceleration axial distribution curve equation of the vortex flow sensor structure, specifically including the following steps

[0082] S21: obtaining an axial acceleration function of the vortex flow sensor structure and a function constraint condition;

[0083] The axial acceleration function includes an acceleration axial distribution function of the straight contraction section and an acceleration axial distribution function of the curved contraction section, and its expression is

[0084] l1=a1x (1)

[0085] l2=a2x2 +b2x+c2(2)

[0086] In the formula: l1 represents the acceleration function of the straight contraction section; l2 represents the acceleration function of the curved contraction section, and passes through the point (L, 0); a1, a2, b2, and c2 represent the constant term coefficients of the axial acceleration function; x represents the distance of the cross section from the construction entrance of the combined contraction section; the embodiment is based on the wind tunnel contraction section design idea and the ideal fluid flow equation, and needs to determine an axial acceleration of the fluid in the structure, calculate the entire flow field, and select a suitable streamline as the contraction section wall surface curve. Since the combined contraction section designed in the embodiment ends with a curved contraction, the acceleration is 0 in the ideal state; due to the characteristics of the curved contraction, the flow velocity at the end of the curved contraction section changes relatively gently, so at the end of the contraction section, the flow velocity reaches a stable value, and the fluid no longer undergoes an acceleration process, so the acceleration is 0 in the ideal state. Therefore, the axial acceleration function is determined as a combination of a proportional function passing through the origin and a quadratic function, wherein the quadratic function opens downward, the proportional function is coaxial with the quadratic function, and the highest point coincides with the vertex of the quadratic function; the combined curve is as shown in Figure 3 , wherein a represents the fluid acceleration, and x represents the distance of the cross section from the entrance of the contraction section. The new combined contraction section designed according to the axial acceleration distribution curve in Figure 3 is as shown in Figure 2 ;

[0087] The expression of the function constraint condition is

[0088] a1>0, a2<0; b2>0(3)

[0089]

[0090]

[0091] x2=L(7)

[0092] In the formula: x1 and x2 represent the analytical solutions of the acceleration axial distribution function of the curved contraction section; L represents the length of the combined contraction section; and m represents the position where the acceleration reaches the maximum;

[0093] S22: Simplify formula (4), and the expression is

[0094]

[0095] By combining formula (8) and formula (6), formula (9) can be obtained

[0096]

[0097] S23: By combining formula (9), formula (6), and formula (7), formula (10) can be obtained

[0098]

[0099] And further simultaneous equation (10) and equation (6) can get equation (11) is

[0100]

[0101] S24: equation (11) and equation (10) can be obtained by simultaneous equation (12) is

[0102]

[0103] And further simultaneous equation (12) and equation (8) can get equation (13) is

[0104]

[0105] S25: according to step S24, the acceleration axis distribution curve equation of vortex flow sensor structure is constructed, and its expression is

[0106]

[0107] S3: based on the maximum acceleration limit value of the given fluid in the vortex flow sensor, the position of the maximum acceleration of the curve contraction structure is randomly set, and the length of the combined contraction section member is randomly set based on the size of the vortex flow sensor;

[0108] S4: based on the acceleration axis distribution curve equation, the structure design parameters of the vortex flow sensor are solved and obtained according to the position of the maximum acceleration and the length of the combined contraction section member, and the structure contraction curve equation is confirmed based on the structure design parameters, which comprises the following steps

[0109] S41: a one-dimensional fluid acceleration equation for inputting fluid of vortex flow sensor is obtained, and its expression is

[0110]

[0111] And it is simplified to obtain equation (16)

[0112] Kadx=udu(16)

[0113] In the formula: u represents fluid velocity; K represents the structure design parameter of the vortex flow sensor to be solved; a represents fluid acceleration;

[0114] S42: equation (14) is brought into equation (16) for piecewise integral operation, and the fluid flow field is solved and obtained, and its expression is

[0115] In the range of x≤m, when x=m, u=u1, the fluid flow field is obtained as:

[0116] u1 2 =u0 2 +Km 2 (L-m) 2 (17)

[0117] In the range of m < x ≤ L, when x = L, u = u2, the fluid flow field is obtained as:

[0118]

[0119] S43: formula (17) and formula (18) are combined to obtain the structural design parameters of the vortex flow sensor, and the expression is

[0120]

[0121] The structural design parameters of the vortex flow sensor are substituted into formula (17) and formula (18) to obtain the structural contraction curve equation of the vortex flow sensor; as shown in the embodiment, based on the structural contraction curve equation of the vortex flow sensor, the contraction ratio n, the contraction section length L and the maximum position m of fluid acceleration can be selected to adjust the new contraction section structure according to different actual situations. Figure 4

[0122] S5: the fluid flow rate of the vortex flow sensor is obtained according to the structural contraction curve equation;

[0123] S6: based on the constructed structure evaluation index model, whether the preset expected index is met is confirmed according to the fluid flow rate and the structural design parameters;

[0124] In specific embodiments, the S6 based on the constructed structure evaluation index model, whether the preset expected index is met is confirmed according to the fluid flow rate and the structural design parameters, and specifically

[0125] The constructed structure evaluation index model is based on the constructed structure evaluation index model, whether the preset expected index is met is confirmed according to the fluid flow rate and the structural design parameters;

[0126] And the preset expected index includes a preset vortex frequency threshold and a preset volume flow threshold;

[0127] The constructed structure evaluation index model is specifically constructed, and the expression is

[0128]

[0129] In the formula, f represents the vortex frequency; U represents the fluid flow rate, that is, the output of the structural contraction curve equation of the vortex flow sensor; D represents the characteristic size of the vortex generator, that is, the combined contraction section component; S t ​denoted by Strouhal number and is a constant; Q represents the volumetric flow rate of the vortex flow sensor; K represents the structural design parameters of the vortex flow sensor.

[0130] If the preset expected index is met, the structural shrinkage ratio of the vortex flow sensor is confirmed based on the fluid flow velocity. The confirmed structural shrinkage ratio, the location of the maximum acceleration of the curve shrinkage structure at this time, and the length of the combined shrinkage section component are the results of the geometric structure optimization design of the vortex flow sensor.

[0131] And the expression for the structural shrinkage ratio of the confirmed vortex flow sensor is:

[0132] u0S0=u1S1=u2S2=n(20)

[0133] In the formula: n represents the contraction ratio; u0 represents the velocity of fluid flowing into the combined contraction section component; S0 represents the cross-sectional area of ​​fluid flowing into the combined contraction section component; u2 represents the velocity of fluid flowing out of the combined contraction section component; S2 represents the cross-sectional area of ​​fluid flowing out of the combined contraction section component; u1 represents the velocity of the fluid at the point of maximum acceleration m on the contraction section component; S1 represents the cross-sectional area of ​​the fluid at the point of maximum acceleration m on the contraction section component; where cross-sectional velocity uniformity refers to the degree of difference in flow velocity at various positions within a specific cross-section. The criterion for judging whether the contraction ratio is appropriate is whether the cross-sectional velocity uniformity is optimal (that is, the degree of difference in flow velocity at various positions is the lowest). The cross-sectional velocity uniformity will be different under different conditions and different contraction ratios. Therefore, it is necessary to design the cross-sectional area and contraction ratio based on the actual situation and the structural contraction curve equation of the vortex flow sensor.

[0134] Otherwise, reselect the location of the maximum acceleration and the length of the contraction segment, and repeat step S4. Figure 5 As shown, in this embodiment, the measurement target of the vortex flowmeter is first determined according to the project requirements, clarifying the fluid type, density, viscosity, etc. Secondly, appropriate assumptions are made about the flow conditions based on the environment, namely, assuming the fluid is incompressible (for most liquids and low-speed gases). Then, the values ​​of n, L, and m are initially determined, and the equation for the axial distribution curve of the designed new contraction section acceleration is calculated. Subsequently, the geometry of the vortex generator is set, and the relationship between vortex frequency, flow rate, and frequency is calculated. Finally, the results are verified and optimized. If the expected engineering accuracy and requirements are not met, the values ​​of n, L, and m need to be redesigned.

[0135] The embodiment combines the straight contraction structure and the curved contraction structure by combining the contraction section members, reduces the sharp change of the flow rate in the contraction process while reducing the manufacturing complexity and cost, ensures that the fluid can enter the measurement section member smoothly and without vortex, solves and obtains the structural design parameters of the vortex flow sensor based on the acceleration axial distribution curve equation, confirms the structural contraction curve equation and obtains the fluid flow rate of the vortex flow sensor; based on the constructed structure evaluation index model, the contraction ratio, the contraction section length and the maximum position of the fluid acceleration that meet the preset expected index are confirmed according to the fluid flow rate and the structural design parameters, so as to realize the flexible optimization design of the vortex flow sensor structure according to different occasions, and thus more accurate and stable measurement results can be provided under various complex working conditions.

[0136] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method of optimizing the design of a vortex flow sensor structure, characterized in that, Specifically comprising the following steps: S1: constructing a simulation structure model of the vortex flow sensor; The simulation structure model comprises, in sequence, a stabilizing segment component for rectifying fluid, a combined contraction segment component for optimizing the flow velocity distribution of the output fluid of the stabilizing segment component and reducing the turbulence degree to obtain a fluid vortex street signal, and a measuring segment component for detecting the fluid vortex street signal; The combined contraction segment component comprises a straight-line contraction structure and a curved-line contraction structure; S2: constructing an acceleration axial distribution curve equation of the vortex flow sensor; S3: based on the maximum acceleration limit value of the fluid in the vortex flow sensor, randomly setting the position of the maximum acceleration of the curved-line contraction structure, and based on the size of the vortex flow sensor, setting the length of the combined contraction segment component; S4: based on the acceleration axial distribution curve equation, according to the position of the maximum acceleration and the length of the combined contraction segment component, solving and obtaining the structure design parameters of the vortex flow sensor, and confirming a structure contraction curve equation based on the structure design parameters; S5: obtaining the fluid flow velocity of the vortex flow sensor according to the structure contraction curve equation; S6: based on the constructed structure evaluation index model, determining whether the preset expected index is met according to the fluid flow velocity and the structure design parameters; the preset expected index comprises a preset vortex frequency threshold and a preset volume flow threshold; if the preset expected index is met, confirming the structure contraction ratio of the vortex flow sensor based on the fluid flow velocity, and the confirmed structure contraction ratio, the position of the maximum acceleration of the curved-line contraction structure at this time, and the length of the combined contraction segment component are the results of the geometric structure optimization design of the vortex flow sensor; The expression for confirming the structure contraction ratio of the vortex flow sensor is In the formula: n represents the shrinkage ratio; This indicates the velocity at which fluid flows into the combined contraction section component; This represents the cross-sectional area through which fluid flows into the combined contraction section component; u 2 indicates the velocity of fluid flowing out of the combined contraction section component; S 2 represents the cross-sectional area of ​​the fluid outflow section of the combined contraction section component; u 1 indicates the point of maximum fluid acceleration on the contraction section component. m speed; S 1 indicates the point of maximum fluid acceleration on the contraction section component. m The cross-sectional area; Otherwise, the position of the maximum acceleration and the length of the contraction segment are reselected, and step S4 is repeatedly executed.

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