US-12618722-B2 - Method and system for temperature measurement of fluid in pipe, electronic device and storage medium

US12618722B2US 12618722 B2US12618722 B2US 12618722B2US-12618722-B2

Abstract

A method and a system for temperature measurement of fluid in a pipe, an electronic device and a storage medium are provided, and relates to the technical field of temperature measurement in a pipe. The method includes: determining fixed parameters of an object to be measured, a flow rate of the fluid, a noise variance and an observation variance; determining a predicted temperature at a current moment according to an optimal internal pipe temperature and a flow rate of the fluid at a previous moment; determining a covariance at the current moment according to the noise variance and an optimal covariance at the previous moment; determining a weight coefficient at the current moment; and determining an optimal internal pipe temperature at the current moment, thereby expanding the application range of temperature measurement in a pipe.

Inventors

Zhigang Shi
Demin Liu
Yandong Zhang
Chao Cai
Chuanbin FU
Wenjie Liu
Zhichao Wang

Assignees

Qingdao university of technology

Dates

Publication Date: 20260505
Application Date: 20240307
Priority Date: 20230308

Claims (10)

1 . A method for temperature measurement of fluid in a pipe, comprising: determining fixed parameters and process parameters of an object to be measured; wherein the object to be measured is a pipe with fluid therein; the fixed parameters comprise a flow rate of the fluid, a wall thickness of the pipe, a thermal conductivity of a wall material of the pipe, a convective heat transfer coefficient of the fluid and a convective heat transfer coefficient of an outer air; the process parameters comprise a noise variance and an observation variance; acquiring an outer air temperature and an outer wall temperature of the pipe at a current moment; determining a predicted temperature at the current moment according to an optimal internal pipe temperature and a flow rate of the fluid at a previous moment; determining a covariance at the current moment according to the noise variance and an optimal covariance at the previous moment, wherein the optimal covariance at the previous moment is determined according to a weight coefficient at the previous moment, a covariance at the previous moment, the fixed parameters and the observation variance; and an optimal internal pipe temperature, a weight coefficient and a covariance at an initial moment are obtained by initializing the parameters of the object to be measured; determining a weight coefficient at the current moment according to the fixed parameters, the observation variance and the covariance at the current moment; and determining an optimal internal pipe fluid temperature at the current moment according to the predicted temperature at the current moment, the weight coefficient at the current moment, the outer wall temperature of the pipe at the current moment, the air temperature at the current moment, the fixed parameters and the observation variance.
2 . The method according to claim 1 , wherein a process for determining the fixed parameters comprises: acquiring an inner diameter of the pipe, a thermal conductivity of the fluid, the flow rate of the fluid, a kinematic viscosity of the fluid, a thermal conductivity of the air and a length of the pipe; calculating the convective heat transfer coefficient of the fluid according to a Prandtl coefficient, the inner diameter of the pipe, the thermal conductivity of the fluid, the flow rate of the fluid and the kinematic viscosity of the fluid; and calculating the convective heat transfer coefficient of the air according to a Grashoff criterion number, the Prandtl coefficient, the thermal conductivity of the air, the inner diameter of the pipe and the length of the pipe.
3 . The method according to claim 2 , wherein the calculating the convective heat transfer coefficient of the air according to the Grashoff criterion number, the Prandtl coefficient, the thermal conductivity of the air, the inner diameter of the pipe and the length of the pipe comprises: determining whether the pipe is a horizontal pipe or a vertical pipe; determining the convective heat transfer coefficient of the air according to the Grashoff criterion number, the Prandtl coefficient, the thermal conductivity of the air and the inner diameter of the pipe when the pipe is the horizontal pipe; and determining the convective heat transfer coefficient of the air according to the Grashoff criterion number, the Prandtl coefficient, the thermal conductivity of the air and the length of the pipe when the pipe is the vertical pipe.
4 . An electronic device, comprising: one or more processors; and a memory storage on which one or more programs are stored; wherein the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the method for temperature measurement of fluid in the pipe according to claim 1 .
5 . The electronic device according to claim 4 , wherein a process for determining the fixed parameters comprises: acquiring an inner diameter of the pipe, a thermal conductivity of the fluid, the flow rate of the fluid, a kinematic viscosity of the fluid, a thermal conductivity of the air and a length of the pipe; calculating the convective heat transfer coefficient of the fluid according to a Prandtl coefficient, the inner diameter of the pipe, the thermal conductivity of the fluid, the flow rate of the fluid and the kinematic viscosity of the fluid; and calculating the convective heat transfer coefficient of the air according to a Grashoff criterion number, the Prandtl coefficient, the thermal conductivity of the air, the inner diameter of the pipe and the length of the pipe.
6 . The electronic device according to claim 5 , wherein the calculating the convective heat transfer coefficient of the air according to the Grashoff criterion number, the Prandtl coefficient, the thermal conductivity of the air, the inner diameter of the pipe and the length of the pipe comprises: determining whether the pipe is a horizontal pipe or a vertical pipe; determining the convective heat transfer coefficient of the air according to the Grashoff criterion number, the Prandtl coefficient, the thermal conductivity of the air and the inner diameter of the pipe when the pipe is the horizontal pipe; and determining the convective heat transfer coefficient of the air according to the Grashoff criterion number, the Prandtl coefficient, the thermal conductivity of the air and the length of the pipe when the pipe is the vertical pipe.
7 . A storage medium on which a computer program is stored thereon, wherein the computer program, when executed by a processor, implements the method for temperature measurement of fluid in the pipe according to claim 1 .
8 . The storage medium according to claim 7 , wherein a process for determining the fixed parameters comprises: acquiring an inner diameter of the pipe, a thermal conductivity of the fluid, the flow rate of the fluid, a kinematic viscosity of the fluid, a thermal conductivity of the air and a length of the pipe; calculating the convective heat transfer coefficient of the fluid according to a Prandtl coefficient, the inner diameter of the pipe, the thermal conductivity of the fluid, the flow rate of the fluid and the kinematic viscosity of the fluid; and calculating the convective heat transfer coefficient of the air according to a Grashoff criterion number, the Prandtl coefficient, the thermal conductivity of the air, the inner diameter of the pipe and the length of the pipe.
9 . The storage medium according to claim 8 , wherein the calculating the convective heat transfer coefficient of the air according to the Grashoff criterion number, the Prandtl coefficient, the thermal conductivity of the air, the inner diameter of the pipe and the length of the pipe comprises: determining whether the pipe is a horizontal pipe or a vertical pipe; determining the convective heat transfer coefficient of the air according to the Grashoff criterion number, the Prandtl coefficient, the thermal conductivity of the air and the inner diameter of the pipe when the pipe is the horizontal pipe; and determining the convective heat transfer coefficient of the air according to the Grashoff criterion number, the Prandtl coefficient, the thermal conductivity of the air and the length of the pipe when the pipe is the vertical pipe.
10 . A system for temperature measurement of fluid in a pipe, wherein the system comprises: a parameter determining module, configured to determine fixed parameters and process parameters of an object to be measured; wherein the object to be measured is a pipe with fluid therein; the fixed parameters comprise a flow rate of the fluid, a wall thickness of the pipe, a thermal conductivity of a wall material of the pipe, a convective heat transfer coefficient of the fluid and a convective heat transfer coefficient of an outer air; and the process parameters comprise a noise variance and an observation variance; a temperature acquiring module configured to acquire an outer air temperature and an outer wall temperature of the pipe at a current moment; a predicted temperature determining module, configured to determine a predicted temperature at the current moment according to an optimal internal pipe temperature and a flow rate of the fluid at a previous moment; a covariance determining module configured to determine a covariance at the current moment according to the noise variance and an optimal covariance at the previous moment, wherein the optimal covariance at the previous moment is determined according to a weight coefficient at the previous moment, a covariance at the previous moment, the fixed parameters and the observation variance; and an optimal internal pipe temperature, a weight coefficient and a covariance at an initial moment are obtained by initializing the parameters of the object to be measured; a weight coefficient determining module configured to determine the weight coefficient at the current moment according to the fixed parameters, the observation variance and the covariance at the current moment; and an optimal internal pipe fluid temperature determining module, configured to determine the optimal internal pipe fluid temperature at the current moment according to the predicted temperature at the current moment, the weight coefficient at the current moment, the outer wall temperature of the pipe at the current moment, the air temperature at the current moment, the fixed parameters and the observation variance.

Description

CROSS-REFERENCE TO RELATED APPLICATION This patent application claims the benefit and priority of Chinese Patent Application No. 202310213722.4 filed with the China National Intellectual Property Administration on Mar. 8, 2023, the disclosure of which is incorporated by reference herein in its entirety as part of the present application. TECHNICAL FIELD The present disclosure relates to the technical field of temperature measurement in a pipe, in particular to a method and a system for temperature measurement of fluid in a pipe, an electronic device and a storage medium. BACKGROUND At present, most of the temperature measuring devices on the market directly measures the temperature of the surface of an object. If the temperature (such as a water supply temperature in a water supply pipe) of a working medium inside the object needs to be measured, such devices cannot measure the temperature. The current method of measuring the temperature of an internal working medium is generally to directly measure the temperature by penetrating a temperature measuring device into the object, such as a thermometer on a heating pipe. In this way, there are the following effects. First, the penetration of the thermometer increases local resistance to fluid flow and destroys an original working condition, which is very unfavorable for conditions requiring stable internal working conditions. Second, the temperature measurement can only be performed at a fixed point. If a plurality of points or even continuous temperature values are needed, it is necessary to increase instruments and thus increase the cost. Finally, it is difficult to measure the internal working medium for the built working condition, and it is obviously unrealistic to add measuring device to destroy the original structure. At the same time, when the temperature of the internal working medium is too high (such as the temperature of an internal fuel of a rocket ejector is high), it is difficult to penetrate the measuring device, so that it is difficult to perform measurement. Therefore, the existing internal temperature measurement has problems such as a device disturbing the internal working condition, the internal temperature of the object being too high to set up a device, the measuring range being limited, and the inability to perform continuously measurement, etc., thus limiting the application range of the internal temperature measurement. SUMMARY The present disclosure aims to provide a method and a system for temperature measurement of fluid in a pipe, an electronic device and a storage medium, which expand the application range of the internal temperature measurement. In order to achieve the above-mentioned purpose, the present disclosure provides the following solution. The present disclosure relates to a method for temperature measurement of fluid in a pipe, where the method includes: determining fixed parameters and process parameters of an object to be measured; where the object to be measured is a pipe with fluid therein; the fixed parameters include a flow rate of the fluid, a wall thickness of the pipe, a thermal conductivity of a wall material of the pipe, a convective heat transfer coefficient of the fluid and a convective heat transfer coefficient of an air; the process parameters include a noise variance and an observation variance;acquiring an air temperature and an outer wall temperature of the pipe at a current moment;determining a predicted temperature at the current moment according to an optimal internal pipe temperature and a flow rate of the fluid at a previous moment;determining a covariance at the current moment according to the noise variance and an optimal covariance at the previous moment, where the optimal covariance at the previous moment is determined according to a weight coefficient at the previous moment, a covariance at the previous moment, the fixed parameters and the observation variance; and an optimal internal pipe temperature, a weight coefficient and a covariance at an initial moment are obtained by initializing parameters of the object to be measured;determining a weight coefficient at the current moment according to, the fixed parameters and the observation variance and the covariance at the current moment; anddetermining an optimal internal pipe temperature at the current moment according to the predicted temperature at the current moment, the weight coefficient at the current moment, the outer wall temperature of the pipe at the current moment, the air temperature at the current moment, the fixed parameters and the observation variance. In some embodiments, a process of determining the fixed parameters specifically includes: acquiring an inner diameter of the pipe, a thermal conductivity of the fluid, the flow rate of the fluid, a kinematic viscosity of the fluid, a thermal conductivity of the air and a length of the pipe;calculating the convective heat transfer coefficient of the fluid according to a Prandtl co