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ISSN Online: 2377-424X

ISBN Print: 0-89116-909-1

International Heat Transfer Conference 9
August, 19-24, 1990 , Jerusalem, Israel

HIGH TEMPERATURE AIRBORNE FIBRE INSULATIONS HEAT TRANSFER

Get access (open in a dialog) DOI: 10.1615/IHTC9.370
pages 479-484

Resumo

Future reusable hypersonic cruise and atmospheric reentry vehicles require highly efficient thermal insulations. The weight constraints envisaged can be fulfilled only by solutions tailored to the specific environment. Ceramic fibres are an essential constituent of many heat protection systems. To achieve tailored solutions the dependencies of the heat transfer modes in fibrous insulations from macroscopic and microscopic design parameters have to be well understood.

Among the commonly known design parameters are the insulation porosity, the fibre diameter and the reflectivity of the insulation boundaries. In this paper special attention is dedicated to fibre orientation. The relations between radiation, conduction, convection and fibre orientation are established and numerical simulations are compared with experimental results. Investigations are further directed on fibre material aspects like the differences between ceramic and metallic fibres.

Typical temperature and pressure environments for hypersonic cruise and reentry vehicles are given. The relative importance of the different heat transfer modes in these typical environments is discussed and some candidate design principles are outlined.