Fluid structure interaction numerical method was applied to investigate the influence of air inlet position on the cooling effect of the rotating cavity.And

in order to ensure the safety of the turbine disk

the cooling effect was evaluated by an engineering evaluation system

which includes resistance evaluation

heat transfer evaluation and stress distribution evaluation.The results show that

the air inlet position has a great influence on the fluid structure in the rotating cavity

which determines the heat transfer and the temperature distribution of the rotating disk.Furthermore

the thermal stress of the rotating disk related to the temperature gradient can be affected.With the rise of the inlet position

the frictional windage of the rotating cavity increases

the heat transfer of the windward of the disk slacks

and the stress level and the maximum value decline.Therefore

the change of the inlet position has an effect on the failure probability of the turbine disk from two aspects:the material affordability and the working stress.