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Unsteady wall heating flow distribution measurement method based on infrared thermography temperature measurement

A technology of infrared thermal imaging and measurement methods, applied in temperature distribution maps, radiation pyrometry, measurement devices, etc., can solve the problems of inconvenient installation of sensors and inability to solve real-time heat flow distribution problems, and achieve the significance of large-scale engineering and production practice. The effect of improving measurement efficiency and broad application prospects

Inactive Publication Date: 2017-06-23
ZHEJIANG UNIV
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Problems solved by technology

[0003] The existing wall heat flow measurement method is to measure the heat flow intensity of one point at a time, which cannot solve the problem of real-time heat flow distribution in the entire area; moreover, contact measurement is required, and its accuracy depends on the tightness of the heat flow sensor and the measured object, the thickness of the heat flow sensor , The side length of the heat flow sensor is determined, and the installation of the sensor is inconvenient for some complex structures

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  • Unsteady wall heating flow distribution measurement method based on infrared thermography temperature measurement
  • Unsteady wall heating flow distribution measurement method based on infrared thermography temperature measurement
  • Unsteady wall heating flow distribution measurement method based on infrared thermography temperature measurement

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Embodiment Construction

[0021] The present invention is an unsteady wall surface heating heat flow distribution measurement method based on infrared thermal image temperature measurement technology, and the specific steps are as follows:

[0022] 1. Select an object with known density, specific heat capacity and thermal conductivity. The wall thickness is uniform and can be approximated as a flat plate. :

[0023] The infrared temperature measurement technology is used to record the temperature field of the wall surface of the object changing with time, and the recording process starts from the initial heating moment to the temperature of the object being basically unchanged.

[0024] 2. Since the Bi number is much smaller than 1, the thermal resistance in the thickness direction of the wall is ignored, and the heating problem of the object is simplified into a two-dimensional unsteady heat transfer problem, and the unsteady heat balance equation is obtained;

[0025] If the Bi number of the object ...

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Abstract

The invention discloses an unsteady wall heating flow distribution measurement method based on infrared thermography temperature measurement. The method is characterized by recording the time-varying temperature field of a heated wall by using infrared thermography; obtaining an unsteady heat balance equation because a selected object has a uniform wall thickness and is low in thermal resistance in the thickness direction and thus a wall heating problem can be simplified into two-dimensional unsteady heat transfer problem; then, taking the derivatives of the temperature field with respect to time and space, ignoring natural convection and heat radiation, and calculating a heating flow in two-dimensional distribution. The non-contact heat flow measuring method can measure the two-dimensional distribution of wall heat flow in real time.

Description

technical field [0001] The invention relates to a method for measuring the heat flow distribution of a wall surface, in particular to a method for measuring and recording the temperature field change of the wall surface when it is heated by a heating source (such as a flame, an electric heater, hot gas, etc.) by using infrared thermal image temperature measurement technology to calculate the heat flow method of distribution. Background technique [0002] At present, there are three main methods for measuring wall heat flow: (1) using a resistive temperature sensor, obtaining the temperature gradient of known resistance through the output electrical signal, and using Fourier's law to calculate the wall heat flow, such as a plunger heat flow meter; 2) Thermocouple temperature sensors are used to measure heat flow by measuring surface temperature differences, such as thin-film thermocouples; (3) calorimetric elements are used to absorb heat, and the average temperature change r...

Claims

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Application Information

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IPC IPC(8): G01J5/00
CPCG01J5/00G01J5/485
Inventor 王高峰钟亮
Owner ZHEJIANG UNIV
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