Interactions of tip leakage flow and wake in tandem rotors were researched based on the changes of the circumferential position of back rotor in relation to the front rotor.An analysis flow model was established for studying the effect of above flow interactions.The model results indicate the mixing of tip leakage flow and wake can reduce the blockage greatly.3-D numerical simulations were further carried out in high loading tandem rotors with three typical circumferential arrangments and the model results were verified by the numerical results.According to the research

the mixing of back rotor tip leakage flow and front rotor wake can reduce tip blockage almost by 20% compared with non-mixing case and the stall margin of the tandem rotors increases by 11.7% relatively.