Turbine flow calculation method based on multiple signals

Abstract

The invention provides a turbine flow calculation method based on multiple signals, and belongs to the technical field of turbine flow calculation, and the method comprises the following steps: based on the fact that a measured fluid flows through a turbine flow meter, obtaining multiple signals of the measured fluid by utilizing the turbine flow meter, and calculating the multiple signals of the measured fluid to obtain the multiple signals of the measured fluid; the initial volume flow, temperature and pressure of the measured fluid are obtained; querying the physical property parameter table of the measured fluid, and calculating the density and viscosity of the measured fluid in combination with the temperature and pressure of the measured fluid; setting a calibration test bed and calibration flow, obtaining calibration viscosity, obtaining a correction coefficient through nonlinear fitting and calculation, and constructing a volume flow correction formula; the viscosity of the measured fluid and the initial volume flow rate are substituted into a volume flow rate correction formula, the corrected volume flow rate is obtained, and the mass flow rate of the measured fluid is obtained through calculation in combination with the density of the measured fluid; the problem that an existing turbine flowmeter does not have the density, viscosity and mass flow calculation capacity is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of turbine flow calculation, and in particular relates to a turbine flow calculation method based on multiple signals. Background Art

[0002] Turbine flowmeter is the main type of velocity flowmeter. When the measured fluid flows through the turbine flowmeter, the impeller is forced to rotate under the action of the fluid, and its speed is proportional to the average flow velocity in the pipeline. At the same time, the blades periodically cut the magnetic lines of force generated by the electromagnet, changing the magnetic flux of the coil. According to the principle of electromagnetic induction, a pulsating electric potential signal, that is, an electric pulse signal, will be induced in the coil. The frequency of this electric pulse is proportional to the volume flow rate of the measured fluid.

[0003] Existing turbine flow calculation methods can only calculate the volume flow of the measured fluid, but cannot calculate information such as the temperature, pressure, density, viscosity, and mass flow of the measured fluid. Summary of the Invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a turbine flow calculation method based on multiple signals, which solves the problem that the existing turbine flowmeters do not have the ability to calculate density, viscosity and mass flow.

[0005] In order to achieve the above objectives, the technical solution adopted by the present invention is: a turbine flow calculation method based on multiple signals, comprising the following steps: S1. Based on the measured fluid flowing through the turbine flowmeter, the turbine flowmeter is used to obtain multiple signals of the measured fluid, and the multiple signals of the measured fluid are resolved to obtain the initial volume flow rate, temperature and pressure of the measured fluid; S2. Using the turbine flowmeter, query the physical property parameter table of the measured fluid, and calculate the density and viscosity of the measured fluid based on the temperature and pressure of the measured fluid; S3. Setting up a calibration test bench and calibration flow, obtaining calibration viscosity, and calculating a correction coefficient based on the initial volume flow of the measured fluid through nonlinear fitting, and constructing a volume flow correction formula; S4. Substitute the viscosity and initial volume flow rate of the measured fluid into the volume flow correction formula to obtain the corrected volume flow rate. Combined with the density of the measured fluid, the mass flow rate of the measured fluid is calculated to complete the turbine flow calculation.

[0006] The beneficial effects of the present invention are as follows: the present invention calculates the initial volume flow rate of the measured fluid through the turbine flowmeter impeller speed signal, and simultaneously calculates the temperature signal and pressure signal output by the turbine flowmeter to obtain the temperature and pressure of the measured fluid, and calculates the density and viscosity of the measured fluid according to the physical property parameter table of the measured fluid. Through the calibration test bench and combined with nonlinear fitting, the volume flow correction formula is constructed, and the corrected volume flow rate is multiplied by the density to obtain the mass flow rate of the measured fluid. The temperature, pressure, density, viscosity and mass flow rate of the measured fluid are accurately measured by a simple turbine flowmeter, thereby improving the turbine flow calculation capability.

[0007] Furthermore, the S1 includes the following steps: S101, based on the measured fluid flowing through the turbine flowmeter, using the turbine flowmeter, obtaining an impeller speed signal, and resolving the impeller speed signal to obtain an initial volume flow rate of the measured fluid; S102 , using the temperature sensor and pressure sensor in the turbine flowmeter to obtain the temperature signal and pressure signal output by the turbine flowmeter, and solving the temperature signal and pressure signal to obtain the temperature and pressure of the measured fluid respectively.

[0008] The beneficial effect of the above further scheme is: the present invention obtains multiple signals of impeller speed signal, temperature signal and pressure signal by the measured fluid flowing through the turbine flowmeter, thereby achieving data reliability of turbine flow solution and improving solution efficiency and accuracy.

[0009] Furthermore, the S3 includes the following steps: S301, setting a calibration test bench and a calibration flow, and calibrating the turbine flowmeter according to the calibration flow, and obtaining the viscosity of the measured fluid during calibration; S302, setting an initial correction formula according to the calibration flow rate, the initial volume flow rate of the measured fluid, and the viscosity of the measured fluid during calibration, and calculating a correction coefficient through nonlinear fitting; S303: Construct a volume flow correction formula based on the correction coefficient.

[0010] Furthermore, the volume flow correction formula is as follows: ; in, represents the corrected volume flow rate, Indicates the viscosity of the measured fluid, Indicates the initial volume flow rate of the measured fluid, 、 、 、 、 、 as well as Both represent correction factors.

[0011] The beneficial effect of the above further scheme is: the present invention achieves accurate correction of the initial volume flow of the measured fluid by setting up a calibration test bench, obtaining a correction coefficient, and constructing a volume flow correction formula, thereby improving the accuracy of calculating the mass flow.

[0012] Furthermore, the S4 includes the following steps: S401, substituting the viscosity and initial volume flow rate of the measured fluid into the volume flow rate correction formula to calculate the corrected volume flow rate; S402. In combination with the density of the measured fluid, the corrected volume flow rate is multiplied by the density of the measured fluid to obtain the mass flow rate of the measured fluid, thereby completing the turbine flow calculation.

[0013] The beneficial effect of the above further scheme is: the present invention uses the volume flow correction formula and multiplies the corrected volume flow by the density of the measured fluid to obtain the mass flow of the measured fluid, thereby realizing accurate measurement of the temperature, pressure, density, viscosity and mass flow of the measured fluid through a simple turbine flowmeter, providing a wide range of application directions for turbine flow calculation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Flow chart of the method of the present invention. DETAILED DESCRIPTION

[0015] The specific embodiments of the present invention are described below to facilitate understanding of the present invention by those skilled in the art. However, it should be clear that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the appended claims, these changes are obvious, and all inventions and creations utilizing the concepts of the present invention are protected.

[0016] Example like Figure 1 As shown, the present invention provides a turbine flow calculation method based on multiple signals, and its implementation method is as follows: S1. Based on the measured fluid flowing through the turbine flowmeter, the turbine flowmeter is used to obtain multiple signals of the measured fluid, and the multiple signals of the measured fluid are resolved to obtain the initial volume flow rate, temperature and pressure of the measured fluid. The specific steps are as follows: S101, based on the measured fluid flowing through the turbine flowmeter, using the turbine flowmeter, obtaining an impeller speed signal, and resolving the impeller speed signal to obtain an initial volume flow rate of the measured fluid; S102 , using the temperature sensor and pressure sensor in the turbine flowmeter to obtain the temperature signal and pressure signal output by the turbine flowmeter, and solving the temperature signal and pressure signal to obtain the temperature and pressure of the measured fluid respectively.

[0017] In this embodiment, a turbine flow calculation method based on multiple signals is provided, which includes volume flow calculation of the measured fluid, temperature calculation, pressure calculation, density calculation of the measured fluid, viscosity calculation of the measured fluid, volume flow correction of the measured fluid, and mass flow calculation of the measured fluid; Based on the measured fluid flowing through the turbine flowmeter, the turbine flowmeter is used to obtain the impeller speed signal, and the initial volume flow rate of the measured fluid is calculated through the turbine flowmeter impeller speed signal. At the same time, the temperature sensor and pressure sensor in the turbine flowmeter are used to obtain the temperature signal and pressure signal output by the turbine flowmeter, and the temperature of the measured fluid is calculated. and pressure .

[0018] S2. Based on the turbine flowmeter, the physical property parameter table of the measured fluid is queried, and the density and viscosity of the measured fluid are calculated based on the temperature and pressure of the measured fluid.

[0019] In this embodiment, the density of the measured fluid is calculated by querying the measured fluid physical parameter table solidified in the flow meter. and viscosity ; Calculate density The specific steps are: according to the calculated temperature of the measured fluid and pressure , query the solidified measured fluid physical parameter table through two-dimensional linear interpolation method, and calculate the measured fluid density ; Calculating viscosity The specific steps are: according to the calculated temperature of the measured fluid and pressure , query the solidified measured fluid physical parameter table through two-dimensional linear interpolation method, and calculate the measured fluid density .

[0020] S3. Set up a calibration test bench and calibration flow, obtain the calibration viscosity, and calculate the correction coefficient based on the initial volume flow of the measured fluid through nonlinear fitting, and construct a volume flow correction formula. The specific steps are as follows: S301, setting a calibration test bench and a calibration flow, and calibrating the turbine flowmeter according to the calibration flow, and obtaining the viscosity of the measured fluid during calibration; S302, setting an initial correction formula according to the calibration flow rate, the initial volume flow rate of the measured fluid, and the viscosity of the measured fluid during calibration, and calculating a correction coefficient through nonlinear fitting; S303: Construct a volume flow correction formula based on the correction coefficient.

[0021] In this embodiment, in order to construct the volume flow correction formula, a calibration test bench and a calibration flow , the calibration flow is specifically the standard flow of the calibration test bench; According to the calibration flow Calibrate the turbine flowmeter and record the viscosity of the measured fluid during calibration According to the calibration flow rate, the initial volume flow rate of the measured fluid and the viscosity of the measured fluid during calibration, combined with the subsequent nonlinear fitting using the origin function drawing software, an initial correction formula is set. The initial correction formula is as follows: ; in, Indicates the calibration flow rate, Indicates the initial volume flow rate of the measured fluid, Indicates the viscosity of the fluid being measured during calibration. 、 、 、 、 、 as well as Both represent correction coefficients, which are unknown parameters obtained by nonlinear fitting of the initial correction formula; Using the origin function drawing software, nonlinear fitting is performed according to the initial correction formula to calculate the specific value of the correction coefficient. Based on the correction coefficient, the volume flow correction formula is constructed as shown below: ; in, represents the corrected volume flow rate, Indicates the viscosity of the measured fluid, Indicates the initial volume flow rate of the measured fluid, the viscosity of the measured fluid and the initial volume flow rate of the measured fluid , parameters that need to be obtained through actual measurement.

[0022] S4. Substitute the viscosity and initial volume flow rate of the measured fluid into the volume flow correction formula to obtain the corrected volume flow rate. Combined with the density of the measured fluid, the mass flow rate of the measured fluid is calculated to complete the turbine flow calculation. The specific steps are as follows: S401, substituting the viscosity and initial volume flow rate of the measured fluid into the volume flow rate correction formula to calculate the corrected volume flow rate; S402. In combination with the density of the measured fluid, the corrected volume flow rate is multiplied by the density of the measured fluid to obtain the mass flow rate of the measured fluid, thereby completing the turbine flow calculation.

[0023] In this embodiment, the viscosity of the fluid to be measured is Substitute the volume flow correction formula to obtain the corrected volume flow , and then the corrected volume flow Density of the fluid being measured Multiply them to get the mass flow rate of the measured fluid , the calculation expression is as follows: ; in, Indicates the mass flow rate of the measured fluid.

Claims

1. A turbine flow calculation method based on multiple signals, characterized in that: The following steps are involved: S1. Based on the measured fluid flowing through the turbine flowmeter, the turbine flowmeter is used to obtain multiple signals of the measured fluid, and the multiple signals of the measured fluid are resolved to obtain the initial volume flow rate, temperature and pressure of the measured fluid; S2. Using the turbine flowmeter, query the physical property parameter table of the measured fluid, and calculate the density and viscosity of the measured fluid based on the temperature and pressure of the measured fluid; S3. Setting up a calibration test bench and calibration flow, obtaining calibration viscosity, and calculating a correction coefficient based on the initial volume flow of the measured fluid through nonlinear fitting, and constructing a volume flow correction formula; S4. Substitute the viscosity and initial volume flow rate of the measured fluid into the volume flow correction formula to obtain the corrected volume flow rate. Combined with the density of the measured fluid, the mass flow rate of the measured fluid is calculated to complete the turbine flow calculation.

2. The turbine flow calculation method based on multiple signals according to claim 1, characterized in that: Said S1 comprises the following steps: S101, based on the measured fluid flowing through the turbine flowmeter, using the turbine flowmeter, obtaining an impeller speed signal, and resolving the impeller speed signal to obtain an initial volume flow rate of the measured fluid; S102 , using the temperature sensor and pressure sensor in the turbine flowmeter to obtain the temperature signal and pressure signal output by the turbine flowmeter, and solving the temperature signal and pressure signal to obtain the temperature and pressure of the measured fluid respectively.

3. The turbine flow calculation method based on multiple signals according to claim 1, characterized in that: The S3 includes the following steps: S301, setting a calibration test bench and a calibration flow, and calibrating the turbine flowmeter according to the calibration flow, and obtaining the viscosity of the measured fluid during calibration; S302, setting an initial correction formula according to the calibration flow rate, the initial volume flow rate of the measured fluid, and the viscosity of the measured fluid during calibration, and calculating a correction coefficient through nonlinear fitting; S303: Construct a volume flow correction formula based on the correction coefficient.

4. The turbine flow calculation method based on multiple signals according to claim 3 is characterized in that: The volume flow correction formula is as follows: in, represents the corrected volume flow rate, Indicates the viscosity of the measured fluid, Indicates the initial volume flow rate of the measured fluid, 、 、 、 、 、 as well as Both represent correction factors.

5. The turbine flow calculation method based on multiple signals according to claim 1, characterized in that: The S4 comprises the following steps: S401, substituting the viscosity and initial volume flow rate of the measured fluid into the volume flow rate correction formula to calculate the corrected volume flow rate; S402. In combination with the density of the measured fluid, the corrected volume flow rate is multiplied by the density of the measured fluid to obtain the mass flow rate of the measured fluid, thereby completing the turbine flow calculation.

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