To reduce the flow loss in radial pre-swirl system

numerical simulation method was used to analyze the radial pre-swirl system with different air entraining positions of the cavity. The results showed that the swirl ratio of air flow at the pre-swirl nozzle outlet decreased

the temperature drop coefficient and total pressure loss coefficient increased with the increase of the radial air entraining position. When rotational Reynolds number was 7.9×106

the temperature drop coefficient increased by 525% and the total pressure loss coefficient increased by 3.93% when the air entrainment position changed from low to high. The specific entropy increment in the radial pre-swirl system mainly occurred in the pre-swirl nozzle and the co-rotating cavity

accounting for about 80% of the total specific entropy increment. With the increase of the radial air entraining position

the overall specific entropy increment decreased

and the specific entropy increment proportion of the pre-swirl nozzle increased. However

the spectific entropy increment proportion of co-rotating cavity decreased.