Sensibility analysis of inlet pre-swirl angle in the rotating cavity

Unidirectional FSI (fluid structure interaction) numerical method was applied to investigate the influence of the inlet pre-swirl angle on the cooling effect of the rotating cavity.And the cooling effect was evaluated by an engineering evaluation system,which includes resistance evaluation,heat transfer evaluation and stress distribution evaluation for the safety of the turbine disk.The results show that,the swirl ratio is a monotropic function of the inlet pre-swirl angle,while the inlet Reynolds number and the rotational Reynolds number are constant.The swirl ratio has a great influence on the fluid structure in the rotating cavity,which determines the heat transfer and temperature distribution of the rotating disk.Furthermore,the thermal stress of the rotating disk related to the temperature gradient could be affected.With the rise of the swirl ratio,the frictional windage of the rotating cavity increases,the heat transfer of the windward of the disk presents up-down tendency,the stress level and maximum value enlarge.Therefore,the change of the pre-swirl angle has an effect on the failure probability of the turbine disk from two aspects:material affordability and working stress.