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Acta Metall Sin  2010, Vol. 46 Issue (3): 294-303    DOI: 10.3724/SP.J.1037.2009.00578
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MODELLING ON DIRECTIONAL SOLIDIFICATION OF SUPERALLOY BLADES WITH FURNACE WALL TEMPERATURE EVOLUTION
PAN Dong; XU Qingyan; LIU Baicheng
Key Laboratory for Advanced Materials Processing Technology; MOE; Department of Mechanical Engineering; Tsinghua University; Beijing 100084
Cite this article: 

PAN Dong XU Qingyan LIU Baicheng. MODELLING ON DIRECTIONAL SOLIDIFICATION OF SUPERALLOY BLADES WITH FURNACE WALL TEMPERATURE EVOLUTION. Acta Metall Sin, 2010, 46(3): 294-303.

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Abstract  

Ni--based superalloy turbine blades produced by Bridgman directional solidification technology are widely used in both aeronautic and energy industries as key parts of the gas turbine engines. Because of existence of complex heat radiation between the shell surface and the furnace wall, precise control of the temperature distribution within the blade is a challenging task. A modified model based on the Monte Carlo ray tracing method was proposed for the three dimensional temperature simulation of the turbine blades during directional solidification process, in which the furnace wall temperature evolution was considered and calculated. Ray refinement in normal direction was applied to improve the heat radiation calculation precision. Three dimensional finite differential grids for turbine blades and two dimensional differential grids for furnace wall were used together to increase simulation efficiency and save memory consumption. Heat transfer calculation of the blades with the modified model was performed and compared with that of the simplified model in which the furnace wall temperature was treated as constant. Experiments were carried out to validate the proposed model in this paper. It was demonstrated that the modified model revealed the furnace wall temperature change during the withdrawal process and its impact on the blade, and simulated the temperature distribution of the turbine blade with a higher accuracy.

Key words:  superalloy turbine blade      directional solidification      furnace wall temperature      modeling     
Received:  04 September 2009     
Fund: 

Supported by National Basic Research Program of China (No.2005CB724105), National Natural Science Foundation of China (No.10477010) and National High Technology Research and Development Program of China (No.2007AA04Z141)

 

URL: 

https://www.ams.org.cn/EN/10.3724/SP.J.1037.2009.00578     OR     https://www.ams.org.cn/EN/Y2010/V46/I3/294

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