Study Of Multilayer Thermal Insulation By Inverse Problems Method
- Paper number
IAC-07-C2.7.07
- Author
Prof. Oleg Alifanov, Moscow Aviation Institute (MAI), Russia
- Coauthor
Mr. Aleksey V. Nenarokomov, Moscow Aviation Institute (MAI), Russia
- Coauthor
Mr. Vivaldo M. Gonzalez, Moscow Aviation Institute (MAI), Russia
- Year
2007
- Abstract
The purpose of this paper is to introduce a new method in the research of radiative and thermal properties of materials with further applications in the design of Thermal Control Systems (TCS) of spacecrafts. In this paper the radiative and thermal properties (emissivity and thermal conductance) of a multilayered thermal-insulating blanket (MLI), which is a screen-vacuum thermal insulation as a part of the (TCS) for perspective spacecrafts, are estimated. Properties of the materials under study are determined in the result of temperature and heat flux measurement data processing based on the solution of the Inverse Heat Transfer Problem (IHTP) technique. Given are physical and mathematical models of heat transfer processes in a specimen of the multilayered thermal-insulating blanket located in the experimental facility. A mathematical formulation of the inverse heat conduction problem is presented too. The practical approves were made for specimen of the real MLI. Formulations of the transient heat transfer problem usually assume variations in the temperature both in time and in position. However there are many engineering applications in which the variation of temperature within the medium can be neglected and temperature is then considered as a function of time only. Such a formulation of the problem, called a lumped system formulation, provides greater simplification in the analysis of transient heat transfer although the range of applicability is rather restricted. In this situation, a complex heat transfer in a spacecraft MLI is considered for a system of layers, which exchange thermal energy with the environment and between them. The basic heat transfer equation is obtained from the analysis of heat balance under the assumption that the MLI can be considered as a finite number L of isothermal layers.
- Abstract document
- Manuscript document
IAC-07-C2.7.07.pdf (🔒 authorized access only).
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