IDENTIFICATION OF THERMOPHYSICAL CHARACTERISTICS OF CHEMICALLY INTERACTING MATERIALS OF HEAT-PROTECTIVE COATINGS

The high-priority task of creating effi cient thermal protection of various-purpose objects from direct external hightemperature effects is studied. This article proposes a solution to the problem of identifying the thermophysical properties of the materials, which decompose in the course of the chemical interaction and which are used in heatshielding structures. The admissible temperature conditions of a protected object are provided by a multicomponent heat-shielding coating, the components of which, when the temperature threshold is reached, enter into a twostage endothermic reaction with absorption of excessive heat. The thermophysical characteristics of a heatprotective coating to be identifi ed are determined by the solution of the corresponding inverse thermal conductivity problem formulated in a minimax variation form relative to the discrepancy between the results of thermophysical experiment and of mathematical simulation. The parametrization of the identifi able equivalent heat capacity narrows the domain of the search for solutions to a collection of piecewise continuous functions and reduces the set original variational problem to the parametric problem of semi-infi nite optimization, whose solution, based on rather general alternative properties of the optimal temperature residual, makes it possible to minimize this residual in a uniform evaluation metric.
   
Author:  N. S. Al′debenev, S. Yu. Ganigin, D. A. Demoretskii, A. N. Diligenskaya, and M. Yu. Lifshits
Keywords:  heat shielding, thermophysical properties, boundary-value problem, identifi cation, heat-protective coating, inverse problem
Page:  1590