Numerical investigation of tip injection effect on a high-speed axial compressor flow field and performance

Injection is known as a effective method to enhance the flow stability in compressors. The effect of tip injection on the performance of an axial-flow compressor was performed numerically. The numerical results of smooth wall agreed well with experimental data for the global performance of smooth wall. The injective numerical results showed that the injection of upstream near the rotor leading 30% axial chord edge can suspend the stall. Analysis of the effect on tip flow topologies led to some preliminary conclusions as to the flow physics involved in the stall margin improvements afforded by tip injection.