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在四级低速大尺寸轴流压气机实验台上,基于粒子图像测速仪(particle image velocimetry,简称PIV)系统,发展了适用于多级叶轮机械转子内部全通道流场测量的PIV技术.自行研制了光学潜望镜和锁相触发装置,并在第3级转子的外机匣处开设了测量窗口.在设计工作点,对第3级压气机转子叶片全通道的流场进行了详细测量,获得了8个不同叶高截面处的二维速度矢量场.实验结果与三维定常Navier-Stokes(N-S)方程计算结果的对比分析表明:PIV测量结果合理地反映了转子通道内部的流场结构,第3级转子叶尖部分存在尺寸大、影响区域广的叶尖泄漏涡,泄漏涡控制了叶尖区域的流场,而气流在通道其余部分的流动状态较好,不存在明显的低速区.
Based on Particle Image Velocimetry (PIV) system, a PIV technology suitable for the measurement of full-channel flow field inside a multi-stage impeller is developed on a four-stage low-speed and large-scale axial flow compressor bench. Optical periscope and phase lock triggering device and a measuring window was set up at the outer casing of the third stage rotor.At the design work point, the flow field of the full path of the third stage compressor rotor blade was measured in detail, Dimensional velocity vector field at eight different leaf-height cross-sections.Comparison of the experimental results with the calculated results of the three-dimensional Navier-Stokes (NS) equations shows that the PIV measurements reasonably reflect the flow field structure inside the rotor channel, and the third The tip vortex of the rotor has large size and wide influence on the tip leakage vortex. The leakage vortex controls the flow field in the tip region, while the flow of air flow in the rest of the channel is good, and there is no obvious low velocity zone.