At the stall boundary condition of a transonic compressor rotor

numerical simulation method was used to study the effects on operation performance with different inlet fogging conditions. Correlation curves between performance parameters

including air flow

total pressure ratio

isentropic efficiency and specific work

and inlet fogging parameters

including water droplet diameter

velocity

temperature and water spray rate

were obtained. Results showed that inlet fogging can increase air flow

heighten total pressure ratio

enhance isentropic efficiency and reduce specific work. Through analyzing the flow field in detail

it was found that inlet fogging can inject high momentum water droplet to tip stagnation zone

decrease blockage region

move down the interface between main flow and leakage flow

weaken the strength of shock

reduce tip load and increase load at mainstream region. A parameter named water droplet area flow was taken to evaluate the effect on flow field with different fogging conditions quantitatively.