Stable measurement method for heat conduction coefficient of non-embedded multilayer composite material

Abstract

The invention discloses a stable measurement method for a heat conduction coefficient of a non-embedded multilayer composite material. The method comprises the following steps that the multilayer composite material comprises g composite material layers, a to-be-identified material layer m is clamped in the composite material layers, a heat conduction coefficient of the to-be-identified material layer m is divided into n segments, each segment of heat conduction coefficient serves as a linear function of the temperature, 2n groups of material heat insulation performance test are carried out on the multilayer composite material, a boundary condition of material heat insulation performance test includes a constant temperature boundary of the front side of the multiplayer composite material and a constant heat flow boundary of the back side of the multilayer composite material, after that the multilayer composite material is thermally stabled, the temperature value of the back side of the multilayer composite material is measured and recorded, a one-dimensional model is generated and separated into two one-dimensional models by the to-be-identified material layer, the two one-dimensional models generate corresponding temperature fields based on the boundary condition, and each segment of the heat conduction coefficient of the to-be-identified material layer is generated based on the temperature field to obtain a heat conduction coefficient measuring value of the to-be-identified material layer.

Description

technical field [0001] The invention belongs to the field of heat transfer, in particular to a steady-state measurement method for the thermal conductivity of non-embedded multilayer composite materials. Background technique [0002] In the field of aerospace, due to the extreme and complexity of the application environment, the outer walls of hypersonic vehicles are mostly made of high heat-resistant multilayer composite materials. Multilayer composites are laminated and pressed from several materials with different properties and have excellent mechanical and thermal insulation properties. Accurately obtaining the thermophysical properties of each layer of material is a necessary prerequisite for the use of multilayer composites. In order to accurately obtain the thermal insulation performance of typical multi-layer composite materials in different use environments, and support material application evaluation, it is necessary to carry out typical thermal insulation materi...

AI Technical Summary

Problems solved by technology

When the existing measurement technology measures the thermal conductivity of a layer of a multilayer composite material, it is necessary to disassemble the multilayer composite material or insert a detector into the material, which will cause damage to the multilayer composite material

Or, when a certain layer of material is taken out separately and the thermal conductivity is measured, the measurement result will be inaccurate due to excessive radiation heat dissipation

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