<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>This paper deals with the problems faced during the research on the insulating structures used in the thermal shielding of flight recorders. These structures are characterised by specific properties determined by, among other aspects, their porosity. The complex and coupled heat-exchange phenomena occurring under the operating conditions of the recorders, and in numerous cases combined with mass exchange, require dedicated test methods. The paper characterises the origin of the research problem, presents a methodology for comprehensive testing of the thermal propertiesand uses the example of determining the insulating properties of the Promalight microporous structure ®-1000R. The authors focussed on thermal diffusivity tests performed by means of the oscillatory excitation method. The measurements were conducted on a test stand to determine the effect the type of gas filling had on the porous structure and the pore filling gaspressure effect on the temperature characteristics of apparent thermal diffusivity. The authors also conducted research on the structure’s resistance to direct flame exposure. The analysis of the obtained results enable recognition and characterisation of the key phenomena of heat and mass transfer; the numerical results exert a significant influence on their application.</p>
</abstract>

This paper deals with the problems faced during the research on the insulating structures used in the thermal shielding of flight recorders. These structures are characterised by specific properties determined by, among other aspects, their porosity. The complex and coupled heat-exchange phenomena occurring under the operating conditions of the recorders, and in numerous cases combined with mass exchange, require dedicated test methods. The paper characterises the origin of the research problem, presents a methodology for comprehensive testing of the thermal propertiesand uses the example of determining the insulating properties of the Promalight microporous structure ®-1000R. The authors focussed on thermal diffusivity tests performed by means of the oscillatory excitation method. The measurements were conducted on a test stand to determine the effect the type of gas filling had on the porous structure and the pore filling gaspressure effect on the temperature characteristics of apparent thermal diffusivity. The authors also conducted research on the structure’s resistance to direct flame exposure. The analysis of the obtained results enable recognition and characterisation of the key phenomena of heat and mass transfer; the numerical results exert a significant influence on their application.

Testing the Thermal Properties of the Insulating Structures of A Flight Data Recorder

Acta Mechanica et Automatica

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

This paper deals with the problems faced during the research on the insulating structures used in the thermal shielding of flight recorders. These structures...

Testing the Thermal Properties of the Insulating Structures of A Flight Data Recorder

Published Online: Jun 26, 2024

Page range: 244 - 251

Received: Mar 29, 2023

Accepted: Sep 24, 2023

DOI: https://doi.org/10.2478/ama-2024-0028

Keywords
aerogel insulating structures, thermal–physical properties, thermal diffusivity, Smoluchowski–Knudsen effect, complex thermal analysis, ablation

© 2024 Agnieszka Derewońko et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Testing the Thermal Properties of the Insulating Structures of A Flight Data Recorder

Published Online: Jun 26, 2024

Page range: 244 - 251

Received: Mar 29, 2023

Accepted: Sep 24, 2023

DOI: https://doi.org/10.2478/ama-2024-0028

Keywordsaerogel insulating structures, thermal–physical properties, thermal diffusivity, Smoluchowski–Knudsen effect, complex thermal analysis, ablation

© 2024 Agnieszka Derewońko et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Keywords
aerogel insulating structures, thermal–physical properties, thermal diffusivity, Smoluchowski–Knudsen effect, complex thermal analysis, ablation