Sweeping jet actuator(SJA)has been widely applied for activeflow control in openflows.In this paper,the SJA character in compressor cascade and its performance for separation control in innerflows are discussed.Time-a...Sweeping jet actuator(SJA)has been widely applied for activeflow control in openflows.In this paper,the SJA character in compressor cascade and its performance for separation control in innerflows are discussed.Time-averaged and transientflowfield measurement,together with visualization methods are utilized.It is found that endwall effects are important for both SJA behaviors and SJA performance for separation control in compressor cascades.There is a maximum of 12.7%total pressure loss reduction with SJA placed near the separation position,close to the endwall and under appropriateflowrate.The characteristic frequencies in theflowfield contribute to the capture of influence regions of vortices and excitation jets.Two concentrated shedding vortices and SJA jets impact region helped to judge that SJA energizes low momentumfluids in a large region and matches the high loss core well.To be concrete,theflow separation control mechanism of SJA lies on the interruption of the blade suction surface boundary layer development and the restriction of the lifting of the boundary layer from end-wall towards blade suction surface.展开更多
基金supported by the National Natural Science Foundation of China (Grant Nos.52076052 and U2233207).
文摘Sweeping jet actuator(SJA)has been widely applied for activeflow control in openflows.In this paper,the SJA character in compressor cascade and its performance for separation control in innerflows are discussed.Time-averaged and transientflowfield measurement,together with visualization methods are utilized.It is found that endwall effects are important for both SJA behaviors and SJA performance for separation control in compressor cascades.There is a maximum of 12.7%total pressure loss reduction with SJA placed near the separation position,close to the endwall and under appropriateflowrate.The characteristic frequencies in theflowfield contribute to the capture of influence regions of vortices and excitation jets.Two concentrated shedding vortices and SJA jets impact region helped to judge that SJA energizes low momentumfluids in a large region and matches the high loss core well.To be concrete,theflow separation control mechanism of SJA lies on the interruption of the blade suction surface boundary layer development and the restriction of the lifting of the boundary layer from end-wall towards blade suction surface.
