| Citation: | PENG L，LI L，ZHAO W. Numerical study on coupled heat transfer of rotating disc in centrifugal atomization[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（12）：3456-3466 （in Chinese） doi: 10.13700/j.bh.1001-5965.2022.0152
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Rotating disk atomization is an important method to prepare spherical metal powder. In the preparation of high-melting-point metal powders, by this method, thermal protection is required for both the turntable structure itself and the lower-end driving motor. The coupled heat transfer problem of centrifugal atomization flow field model of molten aluminum was analyzed by numerical simulation, and the temperature field distribution of disk under different materials and disk structures was given. To improve the cooling efficiency, a new type of rotary disk thermal protection structure with fins was developed. The heat dissipation mechanism of the fin structure was analyzed, and the thermal protection effects of different fin positions, fin thickness and fin diameter were compared. The results revealed that the metal rotating shaft with larger specific heat capacity and lower thermal conductivity has lower temperature at its bottom. Moreover, the annular nitrogen flow field formed between the fin and the rotary disk is the main reason to improve the heat dissipation capacity of the rotating shaft. Finally, the lower position the fins, the larger diameter, and the thicker the thickness , the lower the temperature at the bottom of the shaft, resulting in a better cooling effect.
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