Flow Visualization Experiment Based on Filament Traces Method in a Compressor
In order to discover the flow pattern and evolutionary tendency of rotor-blade tip leakage flow and stator-blade suction surface separation flow,the filament traces method was used for flow visualization in a low-speed axial compressor test rig.The results of the flow visualization experiment indicate that the filaments attached at rotor-blade tip and stator-blade suction surface have made a clear description of the rotor tip leakage flow and stator suction surface separation flow.As the compressor mass flow rate is reduced,the rotor tip leakage flow is enhanced,contrast to a weakly suppression exerted by main flow.So,this mechanism of unbalanced momentum results in the trajectory of rotor tip leakage flow moving upstream continually.When the compressor is operating near stall condition,the interface between the main flow and the rotor tip leakage flow is nearly parallel to the leading edge plane at the rotor-blade tip.The experiment results also show that,as the compressor mass flow rate decreases,the stator-blade suction surface separation flow moves forward to the stator leading edge continually,and the large backflow region appears on the suction side of the stator blade root when the compressor is operating near stall condition.
万方数据
维普
