In order to study the influence of the partial nozzle closure on the air supply mass flow rate

air supply temperature and circumferential uniformity of the air supply parameters of the pre-swirl air supply system

the steady-state method with frozen rotor approach was used to simulate the 180° rotating disk cavity model

and the time-space characteristics of transient problems were approximated by changing the rotor phase in the steady-state calculations. Results showed that: at the design point condition(system pressure ratio of 1.32 and rotating Mach number of 0.678)

when the flow area of nozzle was closed by 14.3%

the total bleed air flow and total air supply flow decreased by 10.9% and 9.9%

respectively. The amplitude of fluctuation of the flow rate of a single supply hole increased from 1.1% to 5.4%. The relative total temperature of supply air decreased about 1 K

and the amplitude of fluctuation increased from 0.5 K to 1.5 K.