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《Acta Armamentarii》 2002-02
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Zhang Jin(Chongqing Institute of Technology, Chongqing, 400050) Wu Hulin(Southwest Technical and Engineering Institute)  
Nozzles are very important parts of jet engines. Engines get their forward thrust from the nozzles by high temperature and high-pressure jets. Nozzle temperature increases rapidly resulting from the high temperature fuel jet through thermal conduction and radiation. Ceramic barrier coatings are therefore employed to protect the nozzle by plasma spray. It is impossible to measure the inner and outer surface temperature of a nozzle continuously. Yet it is very important to predict the temperature distribution along the cross-section of a nozzle by simulation and calculation. In view of the characteristics of a nozzle in high temperature engines enduring hot gas, six thermal barrier coatings are designed for the inner surface of nozzle. Physical model of the nozzle with axial symmetry is set up. With FEM method, Marc software and Mentat processing program, the temperature field of the nozzle with different coatings when exposed to fixed temperature load is simulated and calculated. The temperature distribution under instantaneous states along the cross-section of throat in the nozzle is analyzed where hot load is the most heavy. Thus it provides a scientific method for selecting materials of the substrate and coatings, as well as for optimizing the coatings.
【CateGory Index】: TG174.4
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