Abstract
The theoretical rationale for the structural layout of a testing bench with zirconium dioxide heating elements on the basis of modelling radiative-conductive heat transfer are presented. The numerical simulation of radiative-conductive heat transfer for the two-dimensional scaled model of the testing segment with the finite-element analysis software package Ansys 15.0 are performed. The simulation results showed that for the selected layout of the heaters the temperature non-uniformity along the length of the sample over time will not exceed 3 % even at a temperature of 2000 K.
Highlights
The problem of ‘heat barrier’ caused by the aerodynamic heating of long-range ballistic missiles warheads was successfully solved in the mid 1950-s in Russia and other countries [1, 2]
In the late 1960-s first generation reusable spacecraft of Space Shuttle and Buran type were provided with effective carbon-carbon thermal protection coatings (TPC) and high porousity oxide ceramics [6, 7]
This paper aims to provide the theoretical rationale for the structural layout of a testing facility with zirconium dioxide heating elements (HE) on the basis of modelling radiative-conductive heat transfer in “HE unit – test object – heat insulation”
Summary
The problem of ‘heat barrier’ caused by the aerodynamic heating of long-range ballistic missiles warheads was successfully solved in the mid 1950-s in Russia and other countries [1, 2]. Carbon-ceramic composite materials (CCCM) have great perspectives as TPC elements [8, 9] Their advantages include high thermal, chemical and radiation stability and relatively small density. Radiative heating facilities are mostly equipped with halogen incadescent lamps enabling the surface temperature of 1500 K This temperature level is already insufficient for the perspective TPC tests. This paper aims to provide the theoretical rationale for the structural layout of a testing facility with zirconium dioxide HE on the basis of modelling radiative-conductive heat transfer in “HE unit – test object – heat insulation” To achieve this aim required creating physical and mathematical models of heat transfer in the testing segment of radiative heating facility, performing numerical simulation, selecting HE layout and justifying the choice of heat-insulating materials. Known approaches to computation based on solving problems of radiation and combined heat transfer [12-14]
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