CN113779709A - Regulating valve noise determination method - Google Patents
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Abstract
The invention provides a method for determining noise of a regulating valve, which is characterized in that a calculated flow coefficient and an opening degree are obtained based on the model number, the flow characteristic curve and related parameters of the regulating valve, Siemens NX11.0 software is adopted to establish a fluid domain model which is in contact with a fluid medium under the opening degree of the regulating valve and corresponds to the calculated flow coefficient of the regulating valve, and structural models of the regulating valve and a pipeline; establishing a finite element analysis model and a grid model by adopting ANSYS Workbench software and calculating a transient flow field; actran software is adopted to establish a sound field radiation domain grid model and calculate the final noise of the regulating valve, and the noise of the regulating valve with various specifications and different complexity can be accurately calculated, so that accurate data support is provided for the structural design of the regulating valve and the formulation of noise reduction measures.
Description
Technical Field
The invention relates to a noise determination method, in particular to a noise determination method for an adjusting valve.
Background
The regulating valve plays an irreplaceable role in various flow control systems, and as the regulating valve controls the flow of a pipeline in a throttling mode, the instability of a flow field is aggravated in the throttling process, and even new disturbance is caused, so that the regulating valve is always a high noise source in an industrial system, and the noise problem becomes a problem which is increasingly concerned in the industrial field. Therefore, the pneumatic noise calculation of the regulating valve is an important basis for researching the noise generation mechanism, the structural design of the low-noise regulating valve and the implementation of the noise reduction measure of the regulating valve.
In the prior art, noise determination for regulating valves is mainly carried out by using IEC 60534-8-3: 2010 standard carries out noise calculation, and the regulating valve in the standard is simple in classification and only suitable for noise calculation of a conventional limited regulating valve structure. Along with the more and more complicated of governing valve service condition, governing valve kind is more and more to and market are more and more high to the requirement for governing valve noise, prior art is difficult to carry out accurate calculation to the noise of present governing valve.
Therefore, in order to solve the above technical problems, it is necessary to provide a new technical means.
Disclosure of Invention
In view of this, the present invention provides a method for determining noise of a regulating valve, which can accurately calculate the regulated noise of various specifications and different complexities, so as to provide accurate data support for the structural design of the regulating valve and the formulation of noise reduction measures.
The invention provides a method for determining noise of a regulating valve, which comprises the following steps:
s1, obtaining the model and the nominal drift diameter of the regulating valve, determining a flow characteristic curve of the regulating valve, and determining a calculated flow coefficient Cv and the opening of the regulating valve according to actual working condition parameters;
s2, establishing a fluid domain model which is in contact with a fluid medium under the opening degree of the regulating valve corresponding to the maximum flow coefficient of the regulating valve, and establishing a regulating valve and pipeline structure domain model based on Siemens NX11.0 software;
s3, establishing a fluid domain and structure domain finite element analysis model and a grid model based on ANSYS Workbench software, and dividing the regulating valve fluid domain and the pipeline fluid domain based on the finite element model;
the grid model divides the fluid domain and the structural domain of the regulating valve into tetrahedral grids, the network model divides the fluid domain of the regulating valve into hexahedral grids, and the number N of the grids is more than or equal to 100 ten thousand;
s4, determining medium parameters, pipeline parameters and working condition of the regulating valve, inputting the medium parameters, the pipeline material and the working condition parameters of the regulating valve into ANSYS Fluent software to solve a transient flow field, and determining the inlet and outlet pressure, temperature and speed of the regulating valve;
s5, establishing a sound field radiation domain grid model by Actran software, inputting the pressure, temperature and speed of an inlet and an outlet of a regulating valve into the Actran software to calculate the Mach number of sound field radiation, if the Mach number is less than 0.3, adopting Ligthill sound analogy, and if not, adopting Mohring sound analogy;
s6, setting acoustic simulation materials, boundary conditions and a solver in Actran software, converting time domain signals and frequency by adopting an ICFD module, and calculating noise of an adjusting valve;
and S7, judging that the noise of the regulating valve is compared with a theoretical noise value, returning to the step S6 if the absolute value of the error is greater than 3dB, resetting the parameters of Actran software, and taking the noise of the current regulating valve as a final calculation result if the absolute value of the error is less than 3 dB.
Further, in step S4, the medium parameters of the regulating valve include molar mass, isentropic coefficient, and density.
Further, in step S4, the operating condition parameters of the regulating valve include pressure, flow rate and flow rate.
The invention has the beneficial effects that: the invention can accurately calculate the adjusted noises with various specifications and different complexity degrees, thereby providing accurate data support for the structural design of the adjusting valve and the formulation of noise reduction measures.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is a flow chart of the present invention.
Fig. 2 is a schematic view of a regulating valve according to an embodiment of the present invention.
Fig. 3 is a mesh model of the regulator valve of fig. 2.
Fig. 4 is a flow characteristic curve of the regulating valve in the example of fig. 2.
Fig. 5 is a flow rate cloud for the regulator valve of the example of fig. 2.
Fig. 6 is a density cloud of the regulator valve of the example of fig. 2.
Fig. 7 is a pressure plot of the regulator valve of the example of fig. 2.
FIG. 8 is a Mach number plot for the regulator valve of the example of FIG. 2.
Fig. 9 is a graph of sound pressure level of the regulator valve of the example of fig. 2.
FIG. 10 is a sound field cloud and structural vibration cloud for the regulator valve of the example of FIG. 2.
Fig. 11 is a graph of sound pressure level of the regulator valve of the example of fig. 2.
Detailed Description
The invention is described in further detail below with reference to the drawings of the specification:
the invention provides a method for determining noise of a regulating valve, which comprises the following steps:
s1, obtaining the model and the nominal drift diameter of the regulating valve, determining the flow characteristic curve of the regulating valve, and obtaining and calculating a flow coefficient Cv and an opening degree according to actual working condition parameters, wherein the calculating process is the prior art, and the flow characteristic curve is used for model building and screening in subsequent model building, namely: when a valve inner member model and a valve body inner cavity model are established, whether certain parts or structural details need to be omitted or not is determined by the following principle: omitting a target component or structural detail in the process of establishing a model through Siemens NX11.0 software, then calculating a flow coefficient Cv, if the difference value of the calculated flow coefficient and the initial flow coefficient Cv is smaller than a set threshold value, omitting the component or structural detail, and if not, simplifying the calculation difficulty and ensuring the accuracy of a final noise calculation result; the corresponding opening degree of the regulating valve at the moment can be determined by calculating the flow coefficient Cv;
s2, establishing a fluid domain model and a structural domain model which are in contact with a fluid medium under the opening of the regulating valve corresponding to the calculated flow coefficient of the regulating valve based on Siemens NX11.0 software;
s3, establishing a fluid domain and structure domain finite element analysis model and a grid model based on ANSYS Workbench software, and dividing the regulating valve fluid domain and the pipeline fluid domain based on the finite element model; dividing a valve body fluid domain and a pipeline fluid domain of the regulating valve based on the valve trim model and the valve body inner cavity model in the step S2 by using the finite element model;
the grid model divides the fluid domain and the structural domain of the regulating valve into tetrahedral grids, the grid model divides the fluid domain of the regulating valve into hexahedral grids, and the number N of the grids is more than or equal to 100 ten thousand;
s4, determining medium parameters, pipeline parameters and working condition of the regulating valve, inputting the medium parameters, the pipeline material and the working condition parameters of the regulating valve into ANSYS Fluent software to solve a transient flow field, and determining the inlet and outlet pressure, temperature and speed of the regulating valve;
s5, establishing a sound field radiation domain grid model by Actran software, inputting the pressure, temperature and speed of an inlet and an outlet of a regulating valve into the Actran software to calculate the Mach number of sound field radiation, if the Mach number is less than 0.3, adopting Ligthill sound analogy, and if not, adopting Mohring sound analogy; and establishing the position of a sound field monitoring point according to the standard of IEC 60534-8-1: 2005;
s6, setting acoustic simulation materials, boundary conditions and a solver in Actran software, converting time domain signals and frequency by adopting an ICFD module, and calculating noise of an adjusting valve;
and S7, judging that the noise of the regulating valve is compared with a theoretical noise value, returning to the step S6 if the absolute value of the error is greater than 3dB, resetting the parameters of Actran software, and taking the noise of the current regulating valve as a final calculation result if the absolute value of the error is less than 3 dB.
In step S4, the medium parameters of the regulating valve include molar mass, isentropic coefficient, and density; the working condition parameters of the regulating valve comprise pressure, flow and flow rate.
The invention is further illustrated below by means of a specific example:
in this example, the structure of the regulating valve is shown in fig. 2, wherein in fig. 2, the inlet pipeline is shown as (i); a valve body; the third is valve base; fourthly, an outlet pipeline; valve plug; sixthly, the sleeve is provided, and the parameters are shown in the table 1:
TABLE 1
Considering the effect of the regulating valve and the pipeline structure, the transmission sound level vibration energy of the region where the fluid does not pass through is low and can be ignored, so that the part is not modeled; in order to improve the modeling speed and reduce the processing of a fluid model, tiny structural features which have small influence on the Cv value are ignored; according to the IEC60534-2-1:2011 standard and the IEC 60534-8-1:2005 standard, the length of the inlet pipeline of the regulating valve is 2 times of the nominal diameter, and the length of the outlet pipeline of the regulating valve is 6 times of the nominal diameter;
the ANSYS Fluent software is adopted to carry out flow field simulation analysis, the independence verification of the fluid grid is needed, the verified fluid grid is led into Actran, and when sound field calculation is carried out, the grid size can be properly increased, namely, the requirement that six units are divided in the wavelength corresponding to the highest frequency is met. However, considering noise components generated by flow field fluctuation in a small scale range during pneumatic noise calculation, a fluid grid for acoustic calculation needs to be appropriately refined; the division of the structural grid needs to meet 8-10 grid points in the bending vibration wavelength, and as the structural vibration is unknown, a more conservative grid division strategy is adopted, the grid number possibly exceeds the actual requirement, and the grid can be coarsened at the later stage, so that the calculation resource is saved; the division of the sound field grid needs to meet the requirement of dividing six units in the wavelength corresponding to the highest frequency.
In FIG. 3, there are (i) fluid grids; ② solid grids; and thirdly, sound field grids.
As shown in fig. 4, the maximum calculated flow rate coefficient corresponds to an opening of 85%.
The results of the flow field simulation obtained according to the related formula of the fluid dynamics theory and the simulation calculation method of the ANSYS Fluent are shown in table 2:
table 2 flow field simulation results and comparison
As can be seen from the table: 1) except that the errors of theoretical results of outlet Mach number and flow velocity and simulation results are large, the errors of other parameters are less than 3%, and the grid and model simplification influence is small; 2) the errors in the exit mach number and flow rate are due to the effect of the exit recirculation zone, with an error of about 10%.
The opening degree is calculated by ANSYS Fluent software, and the flow speed cloud chart and the pressure scatter chart under the field use working condition are shown in figures 5 to 8.
The positions of the adjusting valve sleeve windows are symmetrically distributed relative to the origin of a coordinate system, so that the pressure is symmetrically distributed in an X-axis range of-0.15; a small number of pressure scattering points exist in the interval, which is caused by the fact that the flow field generates opposite impact and turbulent flow due to the large flow area.
According to IEC 60534-8-3: 2010 standard and governing valve lectotype data table parameter, the A weighted sound pressure level of 1 meter department outside the governing valve pipeline is 56 dB.
The sound pressure level curve of the monitoring point Piont1 calculated by the Actran software simulation is shown in fig. 11. According to the formula 1, the A-weighted sound pressure level 1 meter outside the pipeline of the regulating valve is calculated to be 61 dB.
The sound pressure level error of the standard calculation and the simulation calculation is 8.9 percent and less than 10 percent, so the sound field simulation design is reasonable.
By adopting the noise calculation method for the regulating valve, relevant sound field information, such as sound pressure level curves at any position of a pipeline of the regulating valve, can be obtained through simulation calculation, as shown in fig. 9; such as vibration displacement clouds and acoustic radiation clouds of the regulator valve conduit at specific frequencies, as shown in fig. 10.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (3)
1. A method for determining noise of a regulating valve is characterized in that: the method comprises the following steps:
s1, obtaining the model and the nominal diameter of the regulating valve, determining a flow characteristic curve of the regulating valve, and determining a calculated flow coefficient Cv and the opening of the regulating valve according to actual working condition parameters;
s2, establishing a fluid domain model, a regulating valve and a connecting pipeline structure model of the regulating valve, which are in contact with a fluid medium under the regulating valve opening corresponding to the calculated flow coefficient of the regulating valve, based on Siemens NX11.0 software;
s3, establishing a fluid domain and structure domain finite element analysis model and a grid model based on ANSYS Workbench software, and dividing the regulating valve fluid domain and the pipeline fluid domain based on the finite element model;
the grid model divides a fluid domain and a structural domain of the regulating valve into tetrahedral grids, the network model divides a fluid domain of the pipeline into hexahedral grids, and the number N of the grids is more than or equal to 100 ten thousand;
s4, inputting the medium parameters, the pipeline materials and the working condition parameters of the regulating valve into ANSYS Fluent software to solve a transient flow field based on the medium parameters, the pipeline parameters and the working condition of the regulating valve, and determining the inlet and outlet pressure, the temperature and the speed of the regulating valve;
s5, establishing a sound field radiation domain grid model by Actran software, inputting the pressure, temperature and speed of an inlet and an outlet of a regulating valve into the Actran software to calculate the Mach number of sound field radiation, if the Mach number is less than 0.3, adopting Ligthill sound analogy, and if not, adopting Mohring sound analogy;
s6, setting acoustic simulation materials, boundary conditions and a solver in Actran software, converting time domain signals and frequency by adopting an ICFD module, and calculating noise of an adjusting valve;
and S7, judging that the noise of the regulating valve is compared with a theoretical noise value, returning to the step S6 if the absolute value of the error is greater than 3dB, resetting the parameters of Actran software, and taking the noise of the current regulating valve as a final calculation result if the absolute value of the error is less than 3 dB.
2. The regulator valve noise determination method according to claim 1, wherein: in step S4, the medium parameters of the regulating valve include molar mass, isentropic coefficient, and density.
3. The regulator valve noise determination method according to claim 1, wherein: in step S4, the operating condition parameters of the regulating valve include pressure, flow rate and flow rate.
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| CN114526900A (en) * | 2022-02-21 | 2022-05-24 | 重庆川仪调节阀有限公司 | Cavitation identification method, experiment method and experiment device for flow characteristic experiment of regulating valve |
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