Transient radiation heat flow measurement method based on circular foil heat flow meter

Abstract

The invention discloses a transient heat flow measurement method based on a circular foil heat flow meter. The method comprises the steps that a mathematical model for transient radiation heat flow measurement based on the circular foil heat flow meter is established, and a transient temperature distribution function of the center of the circular foil sheet of the circular foil heat flow meter is acquired; a correlation function of transient temperature of the center of the circular foil sheet and transient output electromotive force of the circular foil heat flow meter is established; and the transient output electromotive force of the circular foil heat flow meter is measured, and distribution of transient radiation heat flow projected to the circular foil heat flow meter along with time is calculated on the basis of the transient temperature distribution function of the circular foil sheet and the correlation function of transient temperature of the center of the circular foil sheet and the transient output electromotive force of the circular foil heat flow meter. Time-varying distribution of the transient radiation heat flow is obtained by calculation through measurement of multiple transient output electromotive force within any one time interval without changing the hardware structure and the use conditions of the circular foil heat flow meter so that accurate measurement of high transient radiation heat flow is realized.

Description

technical field [0001] The invention belongs to the technical field of transient radiation heat flow measurement, in particular to a method for measuring transient heat flow based on a circular foil heat flow meter. Background technique [0002] Heat transfer is a ubiquitous physical phenomenon. As a basic thermophysical quantity, the measurement of heat flux has attracted extensive attention in various fields such as industrial technology and healthy environment. The circular foil heat flow meter is a sensor used in the measurement of radiation heat flow. It has the advantages of stable structure and large measurement range. It is widely used in the fields of combustion chambers and fire experiments. The circular foil heat flow meter was first invented by Robert Gardon, and now it has become a well-developed commercial heat flow sensor. Companies such as Medtherm and Vatell in the United States are well-known manufacturers of the circular foil heat flow meter. [0003] The...

AI Technical Summary

Problems solved by technology

[0004] Although the existing commercial circular foil heat flow meter can be well applied to the measurement of steady-state radiant heat flow, it still has certain limitations for the measurement of high transient heat flow: the circular foil heat flow meter has a certain delay in the measurement of radiant heat flow, and the measurement delay Causes errors in the measurement results, especially in the measurement of high transient heat flow, the sensitivity parameters of the heat flow meter based on steady-state conditions cannot accurately describe the high transient heat flow; in order to solve the problem of transient measurement, the circular foil with a smaller radius is generally selected However, the method of improving the measurement response speed by reducing the radius of the circular foil will be significantly restricted by the machining technology, and the improvement of the high transient response performance of the heat flow meter will require more technical requirements for the mechanical micromachining of the sensor. for harsh

Images