In order to improve the temperature drop of radial pre-swirl system and reduce the flow loss of the system

numerical simulation was carried out to compare the characteristics of temperature reduction and flow losses of different aspect ratio slits with traditional straight hole type receiver holes. Results indicated that the receiver hole effective flow area increased with the slit aspect ratio increase within the range of 1-10

the flow velocity of the nozzle outlet and the dimensionless mass flow of the system also increased; when the rotational Reynolds number was bigger than 2.6×106

the temperature drop of the system increased with the increase of slit aspect ratio

the total pressure loss increased at first and then became stable gradually. The slit-type receiver holes with aspect ratio of 6-10 had much higher temperature drop and higher pressure loss than traditional receiver holes. When rotational Reynolds number was 7.9×106 and the slit type receiver holes aspect ratio was 10

the temperature drop coefficient increased by 36.7% and total pressure loss coefficient increased by 2.2% compared with the traditional straight hole receiver holes.