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Journal of Enhanced Heat Transfer
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ISSN Druckformat: 1065-5131
ISSN Online: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v8.i4.20
pages 231-241

Thermochemical Protection of High Temperature Materials

J. Stricker
Faculty of Aerospace Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel
Y. Goldman
Faculty of Aerospace Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel
Genady Borodyanski
Israel Institute of Technology
heat engineering

ABSTRAKT

An experimental investigation of cooling and heat protection of high temperature objects, by a method based on endothermic chemical reactions is presented. The coolant is CH4 which reacts endothermally with CO2 and H2O. CO2 and H2O are supplied as hot products by hydrocarbon fuel combustion and are also used for heating the tested objects. The method is demonstrated by cooling a hollow tube, and gas turbine blades. Significant wall temperature reduction, of ΔT ≅ 300 K as compared to ΔT = 150 K with inert nitrogen cooling, was obtained for wall temperature of Tw = 1050 K. It was found that at lower temperatures the cooling effectiveness decreases due to the slow rate of the chemical reactions. At higher temperatures the cooling rate remains constant due to diffusion limitations. Moire deflectometry has been used for visualization and qualitative study of the density field around the cooled objects. The cooling method is limited to fuel rich combustion mixtures.


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