Numerical simulations were performed on tip unsteady flow field of a transonic compressor rotor with different work mass flows.The results show that no oscillation occurs in tip flow field of rotor under high mass flow condition,which can be regarded as steady flow field for analysis,and the oscillation of tip leakage vortex is intensive under low mass flow conditions.Furthermore,periodical interference within the tip leakage flow between adjacent blade passages emerges.As a result,aphenomenon calledrotatin...