轴流压气机转子叶尖泄漏涡和尾迹在静子尖区的传播

TRANSPORTATION OF ROTOR TIP LEAKAGE VORTEX AND ROTOR WAKE IN AN AXIAL COMPRESSOR STATOR PASSAGE

用三维激光多普勒测速系统测量了轴流压气机设计状态转子叶尖泄漏涡和尾迹在静子尖区的传播过程。结果表明,转子叶尖泄漏涡和转子尾迹周期地扫过静子通道尖区,导致该区出现周期性的流动阻塞和脉动。转子尾迹在静子通道内追赶上从前一转子叶片通道内下来的叶尖泄漏涡,二者的相互作用和掺混导致静子尖区更为复杂的二次流动。同转子尾迹相比,转子叶尖泄漏涡对静子尖区的影响更为明显和深远。静叶尾部吸力面出现流动分离,分离流同低能物质之间发生相互作用和掺混。

This paper presents an experimental investigation of the transportation of the rotor tip leakage vortex and the rotor wake in an axial compressor stator passage. The unsteady flow field was measured using a 3-component Laser Doppler Velocimetry. The results show that the rotor tip leakage vortex and the rotor wake periodically pass through the tip region of a stator passage, resulting in periodical flow blockages and fluctuations in the stator passage. The wake is mixing with the last rotor tip leakage vortex in the stator passage, leading to more substantial fluctuations in the flow field. The rotor tip leakage vortex has a stronger influence on the downstream endwall flow than the rotor wake. The separation flow near the suction surface is found in the rear of a stator passage. The interaction and the flow mixing are observed among the low-energy fluids from the upstream and the separation flow.