According to high-altitude and low Reynolds number aerodynamic performance requirements of a turbofan engine

the fan/compressor on 0km and 21km operating conditions were simulated using three-dimensional (3-D) numerical simulation software Numeca. The results show that: the three-dimensional numerical simulation results of the 4-stage fan are in good agreement with the experimental results

and the precision can meet the engineering requirements; from 0km to 21km altitude

the inlet blade chord Reynolds number is reduced from 106 to 105

the mass flow rate is reduced by 2%~3%

the total pressure ratio is decreased a bit

and the efficiency is decreased by 3%; in the 3-D numerical simulation of 9-stage compressor

air bleeding is considered; from 0km to 21km altitude

the inlet blade chord Reynolds number is also reduced from 106 to 105

the mass flow rate and total pressure ratio are decreased a bit

and the attenuation of adiabatic efficiency increases from 4% to 7% with the decrease of speed.