阅读说明：本技术 一种适用于流程阀门的整流效果判定方法 (Rectification effect determination method suitable for process valve ) 是由 刘琦 田帅 林哲 朱祖超 于 2021-08-10 设计创作，主要内容包括：本发明公开了一种适用于流程阀门的整流效果判定方法,包括以下步骤：建立流道模型；对实际工况下的阀门和整流器利用Solidworks软件进行三维建模,将整流器模型装配在阀门出口处,对模型流体域进行抽取,获得流道模型,流道模型特征在于：所述流道模型阀门上游为五倍管径,整流器下游为十二倍管径。有益效果：通过数值模拟的方法,对阀后的整流情况进行了反映,利用整流器下游横截面的速度偏心率判定不同结构整流器整流效果的好坏,不需要进行复杂的实验来判断,可以大大减少人力物力,在工程上具有实际意义。(The invention discloses a method for judging a rectification effect suitable for a process valve, which comprises the following steps of: establishing a flow channel model; the method comprises the following steps of carrying out three-dimensional modeling on a valve and a rectifier under actual working conditions by utilizing Solidworks software, assembling a rectifier model at an outlet of the valve, and extracting a model fluid domain to obtain a runner model, wherein the runner model is characterized in that: the upper stream of the runner model valve is five pipe diameters, and the lower stream of the rectifier is twelve pipe diameters. Has the advantages that: the numerical simulation method is used for reflecting the rectification condition behind the valve, judging the rectification effect of the rectifiers with different structures by utilizing the speed eccentricity of the downstream cross sections of the rectifiers, and judging without carrying out complex experiments, so that manpower and material resources can be greatly reduced, and the method has practical significance in engineering.)

1. A rectifying effect judging method suitable for a process valve is characterized by comprising the following steps of:

s101, establishing a flow channel model; the method comprises the following steps of carrying out three-dimensional modeling on a valve and a rectifier under actual working conditions by utilizing Solidworks software, assembling a rectifier model at an outlet of the valve, and extracting a model fluid domain to obtain a runner model, wherein the runner model is characterized in that: the upstream of the runner model valve is five pipe diameters, and the downstream of the rectifier is twelve pipe diameters;

s103, dividing grids; carrying out grid independence verification, selecting the number of grids meeting the requirement, and carrying out grid division on the flow channel model;

s105, carrying out numerical calculation; importing the flow channel grids into ANASYS FLUENT software, setting relevant parameters, and performing numerical calculation;

s107, calculating the speed eccentricity eta of the downstream section; extracting the maximum speed on the cross section of the pipeline downstream of the rectifier, and calculating the speed eccentricity eta of each downstream cross section according to a formula, wherein the calculation formula is as follows:

where Vmax represents the maximum velocity over the downstream pipe cross-section in m/s; v0 represents the average velocity in the pipe in m/s.

S109, judging a rectification effect; and drawing a curve graph of the speed eccentricity along with the flow by utilizing Origin software according to the calculated speed eccentricity, and comparing and analyzing the rectification effects of the rectifiers with different structures.

2. The method as claimed in claim 1, wherein the step of performing the mesh division comprises the steps of:

s1031, respectively exporting each part of the runner model in Solidworks software;

s1032, structural grids are respectively divided for each part of the flow channel model by using ANSYS ICEM CFD software, grids of the valve core and the rectifier are encrypted, and finally the grids of each part are combined into a whole by using the Merge function of ANSYS ICEM CFD software.

3. The method as claimed in claim 1, wherein the implementation of the mesh independence test includes the following steps:

s1033, carrying out grid division on a flow channel model when the valve is fully opened and a rectifier is installed, and dividing the flow channel model into a plurality of flow channel grid models with different grid numbers;

s1034, comparing the flow coefficient and the resistance coefficient under different grid numbers, and selecting the minimum grid number with the flow coefficient and the resistance coefficient basically kept unchanged when the flow coefficient and the resistance coefficient basically keep unchanged along with the increase of the grid number.

4. The method as claimed in claim 1, wherein the step S105 of setting relevant parameters includes the following steps:

s1051, defining a solver in a General module, wherein the solver type adopts a pressure-based solver, and the time type is set as a steady-state calculation mode;

s1052, selecting a calculation model in the Models module, and selecting a Standard k-epsilon model for calculation;

s1053, arranging a fluid medium in the Materials module, and selecting the fluid medium as water or gas according to the actual working condition;

s1054, setting Boundary Conditions in the Boundary Conditions module, selecting velocity-inlets at the entrance, selecting pressure-outlets at the exit, selecting wall at the wall surface, and selecting interface at the interface; when the actual working condition is definite, setting a boundary condition according to the actual working condition; when the actual working condition is not clear, a reasonable boundary condition is set by the user;

s1055, defining interface in the Meshinterfaces module;

s1056, setting a convergence Residual error in a Residual module;

s1057, clicking hybrid Initialization in the Initialization module to initialize;

s1058, after the iteration step number is set in the Run Calculation module, clicking the Calculation module to start numerical Calculation.

5. The method for determining the rectifying effect of the process valve according to claim 1, wherein the specific implementation of extracting the maximum velocity on the cross section of the pipeline downstream of the rectifier in the step S107 comprises the following steps:

s1071, selecting Iso-Surface in the Surface module, and creating a cross section at intervals of 1D at the downstream of the rectifier to create 12 cross sections;

s1072, in the Surface integrators module in the Reports module, the Report Type selects face Maximum, the Field Variable selects Velocity magnetic, and the Surface selects the cross section created at the downstream of the rectifier in the step S1071, so as to obtain the Maximum speed on the cross section.

6. The method for determining the rectifying effect of the process valve according to claim 1, wherein the specific method for determining the rectifying effect is as follows: the smaller the speed eccentricity of the cross section is, the more uniform the speed distribution on the cross section is, the more stable the flow field is, and the better the rectification effect of the rectifier is. The speed eccentricity of the downstream cross section of the rectifier with different structures can be visually seen by drawing a curve graph of the speed eccentricity along with the flow development according to Origin software, so that the rectifying effect of the rectifier with different structures can be judged.

Technical Field

The invention relates to the technical field of rectification effect judgment, in particular to a rectification effect judgment method suitable for a process valve.

Background

The flow valve plays an increasingly important role in the fluid transmission process and is widely applied to the industries of petrochemical industry, water conservancy and hydropower and the like. The device has the functions of adjusting, shunting, opening and closing and the like under different working conditions. However, complex and unstable flows such as vortexes caused by rapid flow and high shear flow in the process valve can develop along the downstream pipeline, which affects the operational reliability of the process valve and the accurate measurement of the pipeline fluid.

In engineering, a rectifier is often installed in front of a pipeline fluid metering device to obtain a stable metering signal. The rectifier is a device for accelerating the development of irregular fluid and alleviating the influence of flow field distortion on the flowmeter, and can acquire stable flow metering signals in a smaller space, thereby greatly improving the accuracy of the flow metering result. The rectifier is installed to be an important way for optimizing the current flow field and improving the performance of the flowmeter.

However, in practical engineering, the quality of the rectifier rectifying effect is usually determined according to results obtained by experimental measurement, which takes a lot of manpower and material resources, and the obtained experimental results have errors and are not necessarily accurate.

An effective solution to the problems in the related art has not been proposed yet.

Disclosure of Invention

The invention provides a method for judging a rectification effect of a flow valve, aiming at the problems in the related art, so as to overcome the technical problems in the prior related art.

Therefore, the invention adopts the following specific technical scheme:

a rectifying effect judging method suitable for a process valve comprises the following steps:

s101, establishing a flow channel model; the method comprises the following steps of carrying out three-dimensional modeling on a valve and a rectifier under actual working conditions by utilizing Solidworks software, assembling a rectifier model at an outlet of the valve, and extracting a model fluid domain to obtain a runner model, wherein the runner model is characterized in that: the upstream of the runner model valve is five pipe diameters, and the downstream of the rectifier is twelve pipe diameters;

s103, dividing grids; carrying out grid independence verification, selecting the number of grids meeting the requirement, and carrying out grid division on the flow channel model;

s105, carrying out numerical calculation; importing the flow channel grids into ANASYS FLUENT software, setting relevant parameters, and performing numerical calculation;

s107, calculating the speed eccentricity eta of the downstream section; extracting the maximum speed on the cross section of the pipeline downstream of the rectifier, and calculating the speed eccentricity eta of each downstream cross section according to a formula, wherein the calculation formula is as follows:

where Vmax represents the maximum velocity over the downstream pipe cross-section in m/s; v0 represents the average velocity in the pipe in m/s.

S109, judging a rectification effect; and drawing a curve graph of the speed eccentricity along with the flow by utilizing Origin software according to the calculated speed eccentricity, and comparing and analyzing the rectification effects of the rectifiers with different structures.

Preferably, the specific implementation of the grid division includes the following steps:

s1031, respectively exporting each part of the runner model in Solidworks software;

s1032, structural grids are respectively divided for each part of the flow channel model by using ANSYS ICEM CFD software, grids of the valve core and the rectifier are encrypted, and finally the grids of each part are combined into a whole by using the Merge function of ANSYS ICEM CFD software.

Preferably, the implementation of the grid independence verification includes the following steps:

s1033, carrying out grid division on a flow channel model when the valve is fully opened and a rectifier is installed, and dividing the flow channel model into a plurality of flow channel grid models with different grid numbers;

s1034, comparing the flow coefficient and the resistance coefficient under different grid numbers, and selecting the minimum grid number with the flow coefficient and the resistance coefficient basically kept unchanged when the flow coefficient and the resistance coefficient basically keep unchanged along with the increase of the grid number.

Preferably, the specific implementation of setting the relevant parameters in step S105 includes the following steps:

s1051, defining a solver in a General module, wherein the solver type adopts a pressure-based solver, and the time type is set as a steady-state calculation mode;

s1052, selecting a calculation model in the Models module, and selecting a Standard k-epsilon model for calculation;

s1053, arranging a fluid medium in the Materials module, and selecting the fluid medium as water or gas according to the actual working condition;

s1054, setting Boundary Conditions in the Boundary Conditions module, selecting velocity-inlets at the entrance, selecting pressure-outlets at the exit, selecting wall at the wall surface, and selecting interface at the interface; when the actual working condition is definite, setting a boundary condition according to the actual working condition; when the actual working condition is not clear, a reasonable boundary condition is set by the user;

s1055, defining the interface in the Mesh Interfaces module;

s1056, setting a convergence Residual error in a Residual module;

s1057, clicking Hybrid Initialization in the Initialization module to initialize;

s1058, after the iteration step number is set in the Run Calculation module, clicking the Calculation module to start numerical Calculation.

Preferably, the specific implementation of extracting the maximum speed on the cross section of the pipeline downstream of the rectifier in the step S107 includes the following steps:

s1071, selecting Iso-Surface in the Surface module, and creating a cross section at intervals of 1D at the downstream of the rectifier to create 12 cross sections;

s1072, in the Surface integrators module in the Reports module, the Report Type selects face Maximum, the Field Variable selects Velocity magnetic, and the Surface selects the cross section created at the downstream of the rectifier in the step S1071, so as to obtain the Maximum speed on the cross section.

Preferably, the specific method for judging the rectification effect is as follows: the smaller the speed eccentricity of the cross section is, the more uniform the speed distribution on the cross section is, the more stable the flow field is, and the better the rectification effect of the rectifier is. The speed eccentricity of the downstream cross section of the rectifier with different structures can be visually seen by drawing a curve graph of the speed eccentricity along with the flow development according to Origin software, so that the rectifying effect of the rectifier with different structures can be judged.

The invention has the beneficial effects that: the numerical simulation method is used for reflecting the rectification condition behind the valve, judging the rectification effect of the rectifiers with different structures by utilizing the speed eccentricity of the downstream cross sections of the rectifiers, and judging without carrying out complex experiments, so that manpower and material resources can be greatly reduced, and the method has practical significance in engineering.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a flowchart of a method for determining a flow valve rectification effect according to an embodiment of the present invention;

fig. 2 is a two-dimensional structural diagram of a rectifier I in a rectifying effect determination method for a process valve according to an embodiment of the present invention;

fig. 3 is a two-dimensional structural diagram of a rectifier II in a rectifying effect determination method for a process valve according to an embodiment of the present invention;

fig. 4 is a schematic view of a flow passage model of a ball valve and a rectifier in a method for determining a flow valve rectification effect according to an embodiment of the present invention;

fig. 5 is a grid diagram of a ball valve and a rectifier flow channel model in a method for determining a flow valve rectification effect according to an embodiment of the present invention;

FIG. 6 is a grid-independent bar graph of flow coefficients and resistance coefficients for a method for determining a flow valve's effectiveness of flow, according to an embodiment of the present invention;

fig. 7 is a graph showing the velocity eccentricity of the downstream cross-sections of two rectifiers as a function of flow in a method for determining the rectifying effect of a process valve according to an embodiment of the present invention.

Detailed Description

For further explanation of the various embodiments, the drawings which form a part of the disclosure and which are incorporated in and constitute a part of this specification, illustrate embodiments and, together with the description, serve to explain the principles of operation of the embodiments, and to enable others of ordinary skill in the art to understand the various embodiments and advantages of the invention, and, by reference to these figures, reference is made to the accompanying drawings, which are not to scale and wherein like reference numerals generally refer to like elements.

According to the embodiment of the invention, the method for judging the rectifying effect of the process valve is provided.

The first embodiment;

as shown in fig. 1 to 7, a method for determining a rectification effect of a process valve according to an embodiment of the present invention includes the following steps:

s101, establishing a flow channel model; the method comprises the following steps of carrying out three-dimensional modeling on a valve and a rectifier under actual working conditions by utilizing Solidworks software, assembling a rectifier model at an outlet of the valve, and extracting a model fluid domain to obtain a runner model, wherein the runner model is characterized in that: the upstream of the runner model valve is five pipe diameters, and the downstream of the rectifier is twelve pipe diameters;

step S103, dividing grids; carrying out grid independence verification, selecting the number of grids meeting the requirement, and carrying out grid division on the flow channel model;

step S105, carrying out numerical calculation; importing the flow channel grids into ANASYS FLUENT software, setting relevant parameters, and performing numerical calculation;

step S107, calculating the speed eccentricity eta of the downstream section; extracting the maximum speed on the cross section of the pipeline downstream of the rectifier, and calculating the speed eccentricity eta of each downstream cross section according to a formula, wherein the calculation formula is as follows:

where Vmax represents the maximum velocity over the downstream pipe cross-section in m/s; v0 represents the average velocity in the pipe in m/s.

Step S109, judging the rectification effect; and drawing a curve graph of the speed eccentricity along with the flow by utilizing Origin software according to the calculated speed eccentricity, and comparing and analyzing the rectification effects of the rectifiers with different structures.

The specific implementation of the grid division comprises the following steps:

step S1031, respectively exporting each part of the runner model in Solidworks software;

step S1032, structural grids are respectively divided for each part of the flow channel model by using ANSYS ICEM CFD software, grids of the valve core and the rectifier are encrypted, and finally the grids of each part are combined into a whole by using the Merge function of ANSYS ICEM CFD software.

The grid independence verification implementation comprises the following steps:

step S1033, carrying out grid division on a flow channel model when the valve is fully opened and a certain rectifier is installed, and dividing the flow channel model into a plurality of sets of flow channel grid models with different grid numbers;

and S1034, comparing the flow coefficient and the resistance coefficient under different grid numbers, and selecting the minimum grid number with the flow coefficient and the resistance coefficient basically kept unchanged when the flow coefficient and the resistance coefficient basically keep unchanged along with the increase of the grid number.

The specific implementation of setting the relevant parameters in step S105 includes the following steps:

step S1051, defining a solver in a General module, wherein the solver type adopts a pressure-based solver, and the time type is set as a steady-state calculation mode;

step S1052, selecting a calculation model in the Models module, and selecting a Standard k-epsilon model for calculation;

s1053, arranging a fluid medium in the Materials module, and selecting the fluid medium as water or gas according to the actual working condition;

step S1054, setting Boundary Conditions in the Boundary Conditions module, selecting a velocity-inlet at an inlet, selecting a pressure-outlet at an outlet, selecting a wall surface and selecting an interface at an interface; when the actual working condition is definite, setting a boundary condition according to the actual working condition; when the actual working condition is not clear, a reasonable boundary condition is set by the user;

step S1055, defining interface in the Mesh Interfaces module;

step S1056, setting convergence Residual in a Residual module;

step S1057, click the Hybrid Initialization in the Initialization module to initialize;

step S1058, after the iteration step number is set in the Run Calculation module, the Calculation module is clicked to start numerical Calculation.

The specific implementation of extracting the maximum speed on the cross section of the pipeline downstream of the rectifier in the step S107 comprises the following steps:

s1071, selecting Iso-Surface in the Surface module, and creating a cross section at intervals of 1D at the downstream of the rectifier to create 12 cross sections;

step S1072, in the Surface integrators module in the Reports module, the Report Type selects face Maximum, the Field Variable selects Velocity magnetic, and the Surface selects the cross section created at the downstream of the rectifier in the step S1071, so as to obtain the Maximum speed on the cross section.

The specific method for judging the rectification effect is as follows: the smaller the speed eccentricity of the cross section is, the more uniform the speed distribution on the cross section is, the more stable the flow field is, and the better the rectification effect of the rectifier is. The speed eccentricity of the downstream cross section of the rectifier with different structures can be visually seen by drawing a curve graph of the speed eccentricity along with the flow development according to Origin software, so that the rectifying effect of the rectifier with different structures can be judged.

Example two;

as shown in fig. 1 to 7, a method for determining a rectification effect of a process valve according to an embodiment of the present invention includes the following steps:

the method comprises the following steps: establishing a flow channel model; selecting a ball valve as a turbulence element, carrying out three-dimensional modeling on a valve and a rectifier under actual working conditions by utilizing Solidworks software, assembling a rectifier I model and a rectifier II model at an outlet of the ball valve, setting the relative opening of the ball valve to be 30% by setting the rectifier I model and the rectifier II model as shown in figures 2 and 3, and extracting a model fluid domain to obtain a flow channel model, wherein the flow channel model is characterized in that: the upstream of the runner model valve is five pipe diameters, the downstream of the rectifier is twelve pipe diameters, and the runner model is shown in figure 4;

step two: dividing grids; carrying out grid independence verification, selecting the number of grids meeting the requirement, and carrying out grid division on the flow channel model;

the specific implementation of the grid division comprises the following steps:

respectively exporting each part of the runner model in Solidworks software;

structural grids are respectively divided for each part of the flow channel model by using ANSYS ICEM CFD software, grids of the valve core and the rectifier are encrypted, and finally the grids of each part are combined into a whole by using the Merge function of ANSYS ICEM CFD software, wherein the flow channel grid model is shown in fig. 5.

The specific implementation of the grid independence verification comprises the following steps:

carrying out grid division aiming at a flow channel model when the valve is fully opened and the rectifier I is installed, and dividing the flow channel model into a plurality of sets of flow channel grid models with different grid numbers;

comparing the flow coefficient and the resistance coefficient under different grid numbers, when the flow coefficient and the resistance coefficient are basically kept unchanged along with the increase of the grid number, selecting the minimum grid number with the flow coefficient and the resistance coefficient basically kept unchanged, as shown in fig. 6, selecting 350 ten thousand grids.

Step three: carrying out numerical calculation; importing the flow channel grids into ANASYS FLUENT software, setting relevant parameters, and performing numerical calculation;

the specific implementation of the setting of the relevant parameters comprises the following steps:

firstly, defining a solver in a General module, wherein the type of the solver adopts a pressure-based solver, and the time type is set as a steady-state calculation mode;

selecting a calculation model in a model module, and selecting a Standard k-epsilon model for calculation;

arranging a fluid medium in the Materials module, and selecting the fluid medium as water according to the actual working condition;

setting Boundary Conditions in the Boundary Conditions module, selecting velocity-inlets at the entrance, selecting pressure-outlets at the exit, selecting wall at the wall surface and selecting interface at the interface; setting boundary conditions according to actual working conditions, wherein the inlet conditions are set to be 1m/s, and the outlet conditions of the rectifier I and the rectifier II are respectively set to be 17876.8Pa and 17880.9 Pa;

defining interface in Mesh interface module;

setting a convergence Residual error in a Residual module;

seventhly, clicking Hybrid Initialization in a Solution Initialization module card for Initialization;

and (8) after the iteration step number is set in the Run Calculation module, clicking the Calculation module to start numerical Calculation.

Step four: calculating the speed eccentricity eta of the downstream section; extracting the maximum speed on the cross section of the pipeline downstream of the rectifier, and calculating the speed eccentricity eta of each downstream cross section according to a formula, wherein the calculation formula is as follows:

where Vmax represents the maximum velocity over the downstream pipe cross-section in m/s; v0 represents the average velocity in the pipe in m/s.

The specific implementation of extracting the maximum velocity on the cross section of the duct downstream of the rectifier comprises the following steps:

selecting Iso-Surface in a Surface module, and creating a cross section at intervals of 1D at the downstream of a rectifier to create 12 cross sections;

secondly, in a Surface integrators module in the Reports module, selecting face Maximum for Report Type, selecting vector Maximum for Field Variable, selecting cross section created at the downstream of the rectifier by Surface, and obtaining the Maximum speed on the cross section, wherein the Maximum speed on the downstream cross sections of the rectifier I and the rectifier II are as follows:

the velocity eccentricity η calculation result is as follows:

step five: judging a rectification effect; and drawing a curve graph of the speed eccentricity along with the flow by utilizing Origin software according to the calculated speed eccentricity, and comparing and analyzing the rectification effects of the rectifiers with different structures.

The specific method for judging the rectification effect is as follows: the smaller the speed eccentricity of the cross section is, the more uniform the speed distribution on the cross section is, the more stable the flow field is, and the better the rectification effect of the rectifier is. As shown in the graph of the velocity eccentricity along with the flow development shown in fig. 7, it can be visually seen that the velocity eccentricity of the downstream section of the rectifier I is greater than that of the downstream section of the rectifier II, and the flow field of the downstream of the rectifier II is more uniform, so that it can be determined that the rectification effect of the rectifier II is better than that of the rectifier I.

In conclusion, by means of the technical scheme, the rectification situation after the valve is reflected through a numerical simulation method, the quality of the rectification effect of the rectifiers with different structures is judged by utilizing the speed eccentricity of the downstream cross sections of the rectifiers, complex experiments are not needed for judgment, manpower and material resources can be greatly reduced, and the method has practical significance in engineering.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.