THE ROLE OF EMITTANCE IN REFRACTORY METAL COATING PERFORMANCE: PART I - REVIEW AND ANALYSIS.
Summary technical rept. 1 Jul 65-31 Jan 66 on Phase 1,
NORTH AMERICAN AVIATION INC LOS ANGELES CA
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The role of emittance was reviewed for the purpose of orienting the planning of a comprehensive program to provide accurate and proper emittance data for thermal calculations needed in the design of advanced aerospace vehicles and engines. The following was found Coated refractory metals are used and are planned for future use on reentry and hypersonic cruise vehicles which are cooled almost solely by the radiation of heat to space. Space engine nozzles and extensions fabricated of coated refractory metals may be cooled to advantage by radiation. Emittance values have a profound effect on the rate of heat rejection, and thereby, on the metal-coating system temperature which, in turn, controls coating life and metal strength. The emittance of a coated refractory metal is a function of its environment which includes temperature, time, partial pressures of the atmospheric constituents, and the free-stream velocity of the atmosphere under extreme temperature conditions.
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