Design method for perforated plate of balance flowmeter based on self-similarity

Abstract

The invention discloses a self-similarity-based balanced flow meter perforated plate design method, which comprises the following steps that primary holes are formed in a perforated plate, the number and the positions of the primary holes are determined according to the shape of the perforated plate, and the diameters of the primary holes are determined according to the size of the perforated plate; iteratively generating a fine hole group around the primary hole according to the measurement precision requirement of the balance flow meter; after iteration is completed, the balanced flowmeter perforated plate is obtained. Self-similar hole groups are arranged on the orifice plate of the flow meter, and the uniformity and the stability of fluid flowing can be effectively improved through special geometric arrangement. Due to the self-similar porous design, fluid flowing through the pore plate can form more uniform speed distribution, turbulent flow and vortex in flowing are reduced, the influence of upstream interference is reduced, and therefore the measuring precision of the flowmeter is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of flow meters, and particularly to a design method for a porous plate of a self-similar balanced flow meter. Background Art

[0002] Traditional flow meters usually use an orifice plate structure to measure the flow rate of fluids. An orifice plate is a device that generates a pressure drop by introducing holes or a porous structure in a pipeline, thereby measuring the flow rate. However, traditional orifice plate structure flow meters have some limitations in certain cases, such as being sensitive to upstream disturbances and having a large pressure loss.

[0003] On the one hand, research mainly focuses on factors such as the pressure loss and discharge coefficient of flow meters, and designs different flow meters to reduce the pressure loss and improve the discharge coefficient. For example, Feng et al. studied an olive-shaped flow meter, which is a new type of differential pressure flow meter. After experimental verification, this flow meter can significantly reduce the pressure loss and also reduce energy consumption. Another example is the conical flow meter. Due to its special streamline design, it can greatly reduce the pressure loss and has a higher measurement accuracy compared to the orifice plate flow meter. Wu Zhongxiang also studied the A+K balanced flow meter in terms of pressure loss and designed a new type of porous plate flow meter with a stable flow field condition and a pressure loss lower than that of the A+K balanced flow meter.

[0004] In addition, some researchers have improved the design of the core component, the porous plate, of the orifice plate flow meter to improve the measurement performance of the flow meter. The design of the porous plate has multiple parameters, such as the aperture, chamfer angle, number of holes, cone angle, etc. For example, Yu Hongshi et al. studied the influence of the chamfer angle of the throttling hole of the porous plate on the performance of the porous orifice plate flow meter and found that setting the inlet chamfer angle within the range of 45° to 60° can greatly improve the measurement performance of the porous orifice plate flow meter. Some researchers also set a cone angle on the surface of the porous plate to improve the efficiency of fluid passing through the porous plate, thereby improving the measurement performance of the flow meter.

[0005] Although many achievements have been made in the current research on the design of flow meters and porous plate structures, the influence of upstream disturbances still cannot be reduced or suppressed, thus improving the measurement accuracy of the flow meter. Summary of the Invention

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a design method for a porous plate of a self-similar balanced flow meter, which can reduce or suppress the influence of upstream disturbances and improve the measurement accuracy of the flow meter.

[0007] To achieve the above purpose, the technical solution provided by the present invention is as follows:

[0008] A design method for a porous plate of a self-similar balanced flow meter, comprising:

[0009] Open primary holes on the orifice plate. The number and positions of the primary holes are determined according to the shape of the orifice plate, and the diameters of the primary holes are determined according to the size of the orifice plate.

[0010] Iteratively generate a group of fine holes around the primary holes according to the measurement accuracy requirements of the balanced flowmeter.

[0011] After the iteration is completed, a porous plate of the balanced flowmeter is obtained.

[0012] Furthermore, for a square porous plate, the design process includes:

[0013] 1) Open a primary hole at the center of the square porous plate. The coordinates of the primary hole are set as (0, 0), and the diameter D = αL, where L is the length of the orifice plate and 0 < α < 1 / 3.

[0014] 2) Iteratively generate eight first - iteration holes around the primary hole, thus dividing the orifice plate into nine regions on average. The centers of the eight first - iteration holes are the centers of the eight regions around the primary hole, and the coordinates are (-5L / 6, -5L / 6), (-5L / 6, 0), (5L / 6, 0), (0, -5L / 6), (0, 5L / 6), (5L / 6, -5L / 6), (5L / 6, 0), (5L / 6, 5L / 6) respectively. The diameters of these first - iteration holes d = αD.

[0015] 3) Determine whether the latest obtained porous plate of the balanced flowmeter meets the measurement accuracy requirements of the balanced flowmeter. If it meets the requirements, the iteration stops, and the latest obtained porous plate of the balanced flowmeter is the final design result. Otherwise, perform iteration on the eight regions around the primary hole with the corresponding first - iteration hole in each region as the center to generate self - similar fine hole groups, and so on, until the latest obtained porous plate of the balanced flowmeter meets the measurement accuracy requirements of the balanced flowmeter.

[0016] Furthermore, for a circular porous plate, the design process includes:

[0017] (1) Open three primary holes on the circular porous plate. The center of each primary hole is at the mid - point of the diameter of the circular porous plate, and the angle between the line connecting the center of the primary hole and the center of the circular porous plate and the line connecting the center of another adjacent primary hole and the center of the circular porous plate is 120 degrees. The diameter of each primary hole is one - fifth of the diameter of the circular porous plate.

[0018] (2) Use the Apollonian Gasket algorithm to generate six second - generation peripheral holes outside the three primary holes and generate a second - generation central hole at the centers of the three primary holes. The diameters of the peripheral holes and the central hole are both one - sixth of the diameter of the circular porous plate.

[0019] Further, for the circular perforated plate, the design process further includes: (3) Using the Apollonian Gasket algorithm to generate three third-generation holes around the central hole of the second generation, each of which is located between adjacent first-generation holes, and the diameter of the third-generation hole is one-seventh of the diameter of the circular perforated plate.

[0020] Compared with the prior art, the principle and advantages of the present technical solution are as follows:

[0021] In the present technical solution, a self-similar hole group is arranged on the orifice plate of the flowmeter. Through special geometric arrangements, the uniformity and stability of fluid flow can be effectively improved. The self-similar porous design enables the fluid flowing through the orifice plate to form a more uniform velocity distribution, reduces turbulence and vortices in the flow, and reduces the influence of upstream interference, thereby improving the measurement accuracy of the flowmeter. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the services required in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0023] Figure 1 is the principle flow chart of a design method for a porous plate of a self-similar balanced flowmeter according to the present invention;

[0024] Figure 2 is the process diagram of the surface hole opening iteration of the square porous plate in a design method for a porous plate of a self-similar balanced flowmeter according to the present invention (a is the initial orifice plate, b is the orifice plate obtained after the first iteration, and c is the orifice plate obtained after the second iteration);

[0025] Figure 3 is the process diagram of the surface hole opening iteration of the circular porous plate in a design method for a porous plate of a self-similar balanced flowmeter according to the present invention (a is the initial orifice plate, b is the second-generation orifice plate, and c is the third-generation orifice plate). DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The present invention will be further described below with reference to specific embodiments:

[0027] As Figure 1 shown, a design method for a porous plate of a self-similar balanced flowmeter according to the present embodiment includes the following steps:

[0028] S1. Open first-generation holes on the orifice plate. The number and positions of the first-generation holes are determined according to the shape of the orifice plate, and the diameter of the first-generation holes is determined according to the size of the orifice plate;

[0029] S2. Iteratively generate a group of fine holes around the primary hole according to the measurement accuracy requirements of the balanced flowmeter;

[0030] S3. After the iteration is completed, a porous plate of the balanced flowmeter is obtained.

[0031] As Figure 2 shown, if the orifice plate is a square porous plate, the design process includes:

[0032] 1) Open a primary hole at the center of the square porous plate. The coordinates of the primary hole are set to (0, 0), and the diameter D = αL, where L is the length of the orifice plate and 0 < α < 1 / 3;

[0033] 2) Iteratively generate eight first - iteration holes around the primary hole, thus dividing the orifice plate into nine regions on average. The centers of the eight first - iteration holes are the centers of the eight regions around the primary hole, and the coordinates are (-5L / 6, -5L / 6), (-5L / 6, 0), (5L / 6, 0), (0, -5L / 6), (0, 5L / 6), (5L / 6, -5L / 6), (5L / 6, 0), (5L / 6, 5L / 6) respectively. The diameter d of these first - iteration holes = αD;

[0034] 3) Determine whether the latest obtained porous plate of the balanced flowmeter meets the measurement accuracy requirements of the balanced flowmeter. If it meets the requirements, the iteration stops, and the latest obtained porous plate of the balanced flowmeter is the final design result. Otherwise, for the eight regions around the primary hole, perform iteration with the corresponding first - iteration hole in each region as the center to generate self - similar fine hole groups, and so on until the latest obtained porous plate of the balanced flowmeter meets the measurement accuracy requirements of the balanced flowmeter.

[0035] As Figure 3 shown, if the orifice plate is a circular porous plate, the design process includes:

[0036] (1) Open three primary holes on the circular porous plate. The center of each primary hole is at the mid - point of the diameter of the circular porous plate, and the angle between the line connecting the center of the primary hole and the center of the circular porous plate and the line connecting the center of another adjacent primary hole and the center of the circular porous plate is 120 degrees. The diameter of each primary hole is one - fifth of the diameter of the circular porous plate;

[0037] (2) Use the Apollonian Gasket algorithm to generate six second - generation outer holes around the three primary holes and generate a second - generation center hole at the centers of the three primary holes. The diameter of the outer holes and the center hole is one - sixth of the diameter of the circular porous plate;

[0038] If the balanced flowmeter designed after step (2) still does not meet the measurement accuracy requirements, then enter step (3):

[0039] (3) The Apollonian Gasket algorithm is used to generate three third-generation holes around the central hole of the second generation, each of which is located between adjacent first-generation holes. The diameter of each of these third-generation holes is one-seventh of the diameter of the circular perforated plate.

[0040] In this embodiment, a self-similar hole group is arranged on the orifice plate of the flowmeter. Through special geometric arrangements, the uniformity and stability of fluid flow can be effectively improved. The self-similar porous design enables the fluid flowing through the orifice plate to form a more uniform velocity distribution, reduce turbulence and vortices in the flow, and reduce the influence of upstream interference, thereby improving the measurement accuracy of the flowmeter.

[0041] The above-described embodiments are only the preferred embodiments of the present invention and do not limit the scope of implementation of the present invention. Therefore, any changes made according to the shape and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A design method for the orifice plate of a self-similar balanced flowmeter, characterized in that Including: Primary holes are formed on the orifice plate. The number and positions of the primary holes are determined according to the shape of the orifice plate, and the diameters of the primary holes are determined according to the size of the orifice plate. According to the measurement accuracy requirements of the balanced flowmeter, a group of fine holes are iteratively generated around the primary holes. After the iteration is completed, a porous plate of the balanced flowmeter is obtained.

2. The design method of the orifice plate of a self-similar based balanced flowmeter according to claim 1, wherein For a square porous plate, the design process includes: 1) A primary hole is formed at the center of the square porous plate. The coordinates of the primary hole are set as (0, 0), and the diameter D = αL, where L is the length of the orifice plate and 0 < α < 1 / 3. 2) Eight first - order iterative holes are iteratively generated around the primary hole, thus dividing the orifice plate into nine regions on average. The centers of the eight first - order iterative holes are the centers of the eight regions around the primary hole, and the coordinates are (-5L / 6, -5L / 6), (-5L / 6, 0), (5L / 6, 0), (0, -5L / 6), (0, 5L / 6), (5L / 6, -5L / 6), (5L / 6, 0), (5L / 6, 5L / 6) respectively. The diameters of these first - order iterative holes d = αD. 3) Determine whether the latest obtained porous plate of the balanced flowmeter meets the measurement accuracy requirements of the balanced flowmeter. If it meets the requirements, the iteration stops, and the latest obtained porous plate of the balanced flowmeter is the final design result. Otherwise, for the eight regions around the primary hole, iterative generation of self - similar fine hole groups is carried out with the corresponding first - order iterative holes in each region as the centers, and so on until the latest obtained porous plate of the balanced flowmeter meets the measurement accuracy requirements of the balanced flowmeter.

3. A design method of a porous plate of a self-similar balanced flowmeter according to claim 1, characterized in that, For a circular porous plate, the design process includes: (1) Three primary holes are formed on the circular porous plate. The center of each primary hole is at the mid - point of the diameter of the circular porous plate, and the angle between the line connecting the center of the primary hole and the center of the circular porous plate and the line connecting the center of another adjacent primary hole and the center of the circular porous plate is 120 degrees. The diameter of each primary hole is one - fifth of the diameter of the circular porous plate. (2) The Apollonian Gasket algorithm is used to generate six second - generation peripheral holes outside the three primary holes and a second - generation central hole at the centers of the three primary holes. The diameters of the peripheral holes and the central hole are both one - sixth of the diameter of the circular porous plate.

4. A design method for the orifice plate of a self-similar balanced flowmeter according to claim 3, characterized in that, For the circular porous plate, the design process also includes: (3) The Apollonian Gasket algorithm is used to generate three third - generation holes located between adjacent primary holes around the second - generation central hole. The diameters of the third - generation holes are all one - seventh of the diameter of the circular porous plate.

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