Abstract:To investigate the flow and temperature reduction characteristics in a cover-plate pre-swirl system, a numerical simulation of the modle with different nozzle angles and different rotational speeds pre-swirl structure. Under the same intake conditions,the disk cavity flow and temperature reduction characteristics of pre-swirl system and vertical intake structure and different pre-swirl angles were studied, the influence of system flow and temperature reduction effect was carried out by rotational Reynolds number. The results show that the vortex generated by the pre-swirl structure in the cover cavity enhances the flow of the disk cavity, compared with the non-pre-swirl structure, the cover cavity pressure and the total outlet temperature are significantly reduced. As the nozzle angles increase,the total temperature and static pressure of the disk cavity increase, and the temperature reduction effect is reduced. With the increase of the rotational Reynolds number,the dimensionless mass flow rate increase, and the dimensionless temperature drop and total pressure loss coefficient decrease. When the pre-swirl angle is reduced from 50°to 30°, the dimensionless temperature drop increase by 23.7%.