关键词: 适航;旋转盘腔;基比切夫数;冷却效果;敏感性分析

Abstract: Fluid-Structure-Interaction numerical method was applied to investigate the effects of the heat flux, which is presented as Chebyshev number, on the cooling of the rotating cavity. The cooling effect was also evaluated in accordance with an engineering evaluation system, which includes resistance evaluation, heat transfer evaluation and stress distribution evaluation, in order to ensure the safety of the turbine disk. The results show that the heat flux and the temperature distribution of the disk exhibited the influence of the variation of the heat flux on the outer rim of the disk which has no effect on the fluid structure of the rotating cavity and the flow resistance. Meanwhile, the thermal stress related to the temperature gradient can be affected. The stress level of the disk rises as increasing the Chebyshev number. The stress on the outer rim of the disk grows greater than it on the inner rim. The peak stress transfers from the centre to the disk rim while the Chebyshev number exceeds the critical value. Therefore, the change of the Chebyshev number has an effect on the failure probability of the turbine disk from both the material affordability and the working stress.

Key words: Airworthiness; Rotating cavity; Chebyshev number; Cooling effect; Sensibility analysis