Abstract: This paper provides a new method suitable for calculating wall temperature and heat flow of ceramic-coated flame tube. The effect of ceramic coating on wall temperature and heat flow of film-cooled flame tube is investigated. Compared with previous literature, two important improvments of this paper are: (1) Heat-transfer analyses for ceramic coating and metal wall are made respectively, in which both axial conduction and radial conduction in the flame tube wall are considered simultaneously. The heat balance equations, which consider practical conditions as much as possible, are established. The conduction coupling relationship between ceramic coating and metal wall is provided. (2)A new method of solution and calculation procedure are given.The heat balance equation of ceramic coating is solved by using dichotomic method. The metal wall temperature is calculated by applying Convection-Conduction-Radiation Coupled Iterative Method.. By calculating the ceramic coating temperature and the metal wall temperature alternatively, the conduction coupling between them is accomplished.

Key words: ceramic coating, flame tube, wall temperature, numerical method